getting started with WPF and XAML

HashingTool/App.xaml.cs

@@ -29,12 +29,26 @@
 *   Martin Rexeis, rexeis@ivt.tugraz.at, IVT, Graz University of Technology
 */
 
-namespace HashingTool
-{
-	/// <summary>
-	/// Interaction logic for App.xaml
-	/// </summary>
-	public partial class App
-	{
-	}
-}
+using System.Runtime.Remoting.Contexts;
+using System.Windows;
+using HashingTool.ViewModel;
+using HashingTool.Views;
+
+namespace HashingTool
+{
+	/// <summary>
+	/// Interaction logic for App.xaml
+	/// </summary>
+	public partial class App : Application
+	{
+		//protected override void OnStartup(StartupEventArgs e)
+		//{
+		//	base.OnStartup(e);
+
+		//	var app = new MainWindow();
+		//	var context = new MainWindowViewModel();
+		//	app.DataContext = context;
+		//	//app.Show();
+		//}
+	}
+}

HashingTool/HashingTool.csproj

@@ -63,11 +63,25 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <Compile Include="Model\TestModel.cs" />
+    <Compile Include="Properties\Annotations.cs" />
     <Compile Include="Properties\Version.cs">
       <DependentUpon>Version.tt</DependentUpon>
       <AutoGen>True</AutoGen>
       <DesignTime>True</DesignTime>
     </Compile>
+    <Compile Include="ViewModel\IMainView.cs" />
+    <Compile Include="ViewModel\MainWindowViewModel.cs" />
+    <Compile Include="ViewModel\ObservableObject.cs" />
+    <Compile Include="ViewModel\RelayCommand.cs" />
+    <Compile Include="ViewModel\HashComponentDataViewModel.cs" />
+    <Compile Include="ViewModel\VerifyInputDataViewModel.cs" />
+    <Compile Include="Views\HashComponentData.xaml.cs">
+      <DependentUpon>HashComponentData.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="Views\VerifyInputData.xaml.cs">
+      <DependentUpon>VerifyInputData.xaml</DependentUpon>
+    </Compile>
     <Page Include="MainWindow.xaml">
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
@@ -80,6 +94,14 @@
       <DependentUpon>MainWindow.xaml</DependentUpon>
       <SubType>Code</SubType>
     </Compile>
+    <Page Include="Views\HashComponentData.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Include="Views\VerifyInputData.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Properties\AssemblyInfo.cs">

HashingTool/MainWindow.xaml

-<Window x:Class="HashingTool.MainWindow"
-        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        Title="VECTO Hashing Tool" Height="422" Width="738">
-	<Grid>
-
+<Window
+	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	xmlns:viewModel="clr-namespace:HashingTool.ViewModel"
+	xmlns:views="clr-namespace:HashingTool.Views"
+	x:Class="HashingTool.MainWindow"
+	Title="VECTO Hashing Tool" Height="552" Width="593">
+	<Window.DataContext>
+		<viewModel:MainWindowViewModel />
+	</Window.DataContext>
+	<Window.Resources>
+		<DataTemplate DataType="{x:Type viewModel:HashComponentDataViewModel}">
+			<views:HashComponentData />
+		</DataTemplate>
+		<DataTemplate DataType="{x:Type viewModel:VerifyInputDataViewModel}">
+			<views:VerifyInputData />
+		</DataTemplate>
+	</Window.Resources>
+	<Grid Margin="10">
+		<DockPanel>
+			<Border DockPanel.Dock="Left" BorderBrush="Black" BorderThickness="0,0,1,0">
+				<ItemsControl ItemsSource="{Binding MainViewModels}">
+					<ItemsControl.ItemTemplate>
+						<DataTemplate>
+							<Grid Margin="0,0,0,5">
+								<Button Content="{Binding Name}" Margin="2,5"
+										Command="{Binding DataContext.ChangeViewCommand, RelativeSource={RelativeSource AncestorType={x:Type Window}}}"
+										CommandParameter="{Binding }" />
+							</Grid>
+						</DataTemplate>
+					</ItemsControl.ItemTemplate>
+				</ItemsControl>
+			</Border>
+			<ContentControl Content="{Binding CurrentViewModel}" />
+		</DockPanel>
 	</Grid>
-</Window>
+</Window>
\ No newline at end of file

HashingTool/MainWindow.xaml.cs

@@ -29,16 +29,16 @@
 *   Martin Rexeis, rexeis@ivt.tugraz.at, IVT, Graz University of Technology
 */
 
-namespace HashingTool
-{
-	/// <summary>
-	/// Interaction logic for MainWindow.xaml
-	/// </summary>
-	public partial class MainWindow
-	{
-		public MainWindow()
-		{
-			InitializeComponent();
-		}
-	}
-}
\ No newline at end of file
+namespace HashingTool
+{
+	/// <summary>
+	/// Interaction logic for MainWindow.xaml
+	/// </summary>
+	public partial class MainWindow
+	{
+		public MainWindow()
+		{
+			InitializeComponent();
+		}
+	}
+}

HashingTool/Properties/Annotations.cs

+using System;
+
+#pragma warning disable 1591
+// ReSharper disable UnusedMember.Global
+// ReSharper disable MemberCanBePrivate.Global
+// ReSharper disable UnusedAutoPropertyAccessor.Global
+// ReSharper disable IntroduceOptionalParameters.Global
+// ReSharper disable MemberCanBeProtected.Global
+// ReSharper disable InconsistentNaming
+
+namespace HashingTool.Annotations
+{
+  /// <summary>
+  /// Indicates that the value of the marked element could be <c>null</c> sometimes,
+  /// so the check for <c>null</c> is necessary before its usage.
+  /// </summary>
+  /// <example><code>
+  /// [CanBeNull] object Test() => null;
+  /// 
+  /// void UseTest() {
+  ///   var p = Test();
+  ///   var s = p.ToString(); // Warning: Possible 'System.NullReferenceException'
+  /// }
+  /// </code></example>
+  [AttributeUsage(
+    AttributeTargets.Method | AttributeTargets.Parameter | AttributeTargets.Property |
+    AttributeTargets.Delegate | AttributeTargets.Field | AttributeTargets.Event)]
+  public sealed class CanBeNullAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates that the value of the marked element could never be <c>null</c>.
+  /// </summary>
+  /// <example><code>
+  /// [NotNull] object Foo() {
+  ///   return null; // Warning: Possible 'null' assignment
+  /// }
+  /// </code></example>
+  [AttributeUsage(
+    AttributeTargets.Method | AttributeTargets.Parameter | AttributeTargets.Property |
+    AttributeTargets.Delegate | AttributeTargets.Field | AttributeTargets.Event)]
+  public sealed class NotNullAttribute : Attribute { }
+
+  /// <summary>
+  /// Can be appplied to symbols of types derived from IEnumerable as well as to symbols of Task
+  /// and Lazy classes to indicate that the value of a collection item, of the Task.Result property
+  /// or of the Lazy.Value property can never be null.
+  /// </summary>
+  [AttributeUsage(
+    AttributeTargets.Method | AttributeTargets.Parameter | AttributeTargets.Property |
+    AttributeTargets.Delegate | AttributeTargets.Field)]
+  public sealed class ItemNotNullAttribute : Attribute { }
+
+  /// <summary>
+  /// Can be appplied to symbols of types derived from IEnumerable as well as to symbols of Task
+  /// and Lazy classes to indicate that the value of a collection item, of the Task.Result property
+  /// or of the Lazy.Value property can be null.
+  /// </summary>
+  [AttributeUsage(
+    AttributeTargets.Method | AttributeTargets.Parameter | AttributeTargets.Property |
+    AttributeTargets.Delegate | AttributeTargets.Field)]
+  public sealed class ItemCanBeNullAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates that the marked method builds string by format pattern and (optional) arguments.
+  /// Parameter, which contains format string, should be given in constructor. The format string
+  /// should be in <see cref="string.Format(IFormatProvider,string,object[])"/>-like form.
+  /// </summary>
+  /// <example><code>
+  /// [StringFormatMethod("message")]
+  /// void ShowError(string message, params object[] args) { /* do something */ }
+  /// 
+  /// void Foo() {
+  ///   ShowError("Failed: {0}"); // Warning: Non-existing argument in format string
+  /// }
+  /// </code></example>
+  [AttributeUsage(
+    AttributeTargets.Constructor | AttributeTargets.Method |
+    AttributeTargets.Property | AttributeTargets.Delegate)]
+  public sealed class StringFormatMethodAttribute : Attribute
+  {
+    /// <param name="formatParameterName">
+    /// Specifies which parameter of an annotated method should be treated as format-string
+    /// </param>
+    public StringFormatMethodAttribute(string formatParameterName)
+    {
+      FormatParameterName = formatParameterName;
+    }
+
+    public string FormatParameterName { get; private set; }
+  }
+
+  /// <summary>
+  /// For a parameter that is expected to be one of the limited set of values.
+  /// Specify fields of which type should be used as values for this parameter.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.Field)]
+  public sealed class ValueProviderAttribute : Attribute
+  {
+    public ValueProviderAttribute(string name)
+    {
+      Name = name;
+    }
+
+    [NotNull] public string Name { get; private set; }
+  }
+
+  /// <summary>
+  /// Indicates that the function argument should be string literal and match one
+  /// of the parameters of the caller function. For example, ReSharper annotates
+  /// the parameter of <see cref="System.ArgumentNullException"/>.
+  /// </summary>
+  /// <example><code>
+  /// void Foo(string param) {
+  ///   if (param == null)
+  ///     throw new ArgumentNullException("par"); // Warning: Cannot resolve symbol
+  /// }
+  /// </code></example>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class InvokerParameterNameAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates that the method is contained in a type that implements
+  /// <c>System.ComponentModel.INotifyPropertyChanged</c> interface and this method
+  /// is used to notify that some property value changed.
+  /// </summary>
+  /// <remarks>
+  /// The method should be non-static and conform to one of the supported signatures:
+  /// <list>
+  /// <item><c>NotifyChanged(string)</c></item>
+  /// <item><c>NotifyChanged(params string[])</c></item>
+  /// <item><c>NotifyChanged{T}(Expression{Func{T}})</c></item>
+  /// <item><c>NotifyChanged{T,U}(Expression{Func{T,U}})</c></item>
+  /// <item><c>SetProperty{T}(ref T, T, string)</c></item>
+  /// </list>
+  /// </remarks>
+  /// <example><code>
+  /// public class Foo : INotifyPropertyChanged {
+  ///   public event PropertyChangedEventHandler PropertyChanged;
+  /// 
+  ///   [NotifyPropertyChangedInvocator]
+  ///   protected virtual void NotifyChanged(string propertyName) { ... }
+  ///
+  ///   string _name;
+  /// 
+  ///   public string Name {
+  ///     get { return _name; }
+  ///     set { _name = value; NotifyChanged("LastName"); /* Warning */ }
+  ///   }
+  /// }
+  /// </code>
+  /// Examples of generated notifications:
+  /// <list>
+  /// <item><c>NotifyChanged("Property")</c></item>
+  /// <item><c>NotifyChanged(() =&gt; Property)</c></item>
+  /// <item><c>NotifyChanged((VM x) =&gt; x.Property)</c></item>
+  /// <item><c>SetProperty(ref myField, value, "Property")</c></item>
+  /// </list>
+  /// </example>
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class NotifyPropertyChangedInvocatorAttribute : Attribute
+  {
+    public NotifyPropertyChangedInvocatorAttribute() { }
+    public NotifyPropertyChangedInvocatorAttribute(string parameterName)
+    {
+      ParameterName = parameterName;
+    }
+
+    public string ParameterName { get; private set; }
+  }
+
+  /// <summary>
+  /// Describes dependency between method input and output.
+  /// </summary>
+  /// <syntax>
+  /// <p>Function Definition Table syntax:</p>
+  /// <list>
+  /// <item>FDT      ::= FDTRow [;FDTRow]*</item>
+  /// <item>FDTRow   ::= Input =&gt; Output | Output &lt;= Input</item>
+  /// <item>Input    ::= ParameterName: Value [, Input]*</item>
+  /// <item>Output   ::= [ParameterName: Value]* {halt|stop|void|nothing|Value}</item>
+  /// <item>Value    ::= true | false | null | notnull | canbenull</item>
+  /// </list>
+  /// If method has single input parameter, it's name could be omitted.<br/>
+  /// Using <c>halt</c> (or <c>void</c>/<c>nothing</c>, which is the same)
+  /// for method output means that the methos doesn't return normally.<br/>
+  /// <c>canbenull</c> annotation is only applicable for output parameters.<br/>
+  /// You can use multiple <c>[ContractAnnotation]</c> for each FDT row,
+  /// or use single attribute with rows separated by semicolon.<br/>
+  /// </syntax>
+  /// <examples><list>
+  /// <item><code>
+  /// [ContractAnnotation("=> halt")]
+  /// public void TerminationMethod()
+  /// </code></item>
+  /// <item><code>
+  /// [ContractAnnotation("halt &lt;= condition: false")]
+  /// public void Assert(bool condition, string text) // regular assertion method
+  /// </code></item>
+  /// <item><code>
+  /// [ContractAnnotation("s:null => true")]
+  /// public bool IsNullOrEmpty(string s) // string.IsNullOrEmpty()
+  /// </code></item>
+  /// <item><code>
+  /// // A method that returns null if the parameter is null,
+  /// // and not null if the parameter is not null
+  /// [ContractAnnotation("null => null; notnull => notnull")]
+  /// public object Transform(object data) 
+  /// </code></item>
+  /// <item><code>
+  /// [ContractAnnotation("s:null=>false; =>true,result:notnull; =>false, result:null")]
+  /// public bool TryParse(string s, out Person result)
+  /// </code></item>
+  /// </list></examples>
+  [AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
+  public sealed class ContractAnnotationAttribute : Attribute
+  {
+    public ContractAnnotationAttribute([NotNull] string contract)
+      : this(contract, false) { }
+
+    public ContractAnnotationAttribute([NotNull] string contract, bool forceFullStates)
+    {
+      Contract = contract;
+      ForceFullStates = forceFullStates;
+    }
+
+    public string Contract { get; private set; }
+    public bool ForceFullStates { get; private set; }
+  }
+
+  /// <summary>
+  /// Indicates that marked element should be localized or not.
+  /// </summary>
+  /// <example><code>
+  /// [LocalizationRequiredAttribute(true)]
+  /// class Foo {
+  ///   string str = "my string"; // Warning: Localizable string
+  /// }
+  /// </code></example>
+  [AttributeUsage(AttributeTargets.All)]
+  public sealed class LocalizationRequiredAttribute : Attribute
+  {
+    public LocalizationRequiredAttribute() : this(true) { }
+    public LocalizationRequiredAttribute(bool required)
+    {
+      Required = required;
+    }
+
+    public bool Required { get; private set; }
+  }
+
+  /// <summary>
+  /// Indicates that the value of the marked type (or its derivatives)
+  /// cannot be compared using '==' or '!=' operators and <c>Equals()</c>
+  /// should be used instead. However, using '==' or '!=' for comparison
+  /// with <c>null</c> is always permitted.
+  /// </summary>
+  /// <example><code>
+  /// [CannotApplyEqualityOperator]
+  /// class NoEquality { }
+  /// 
+  /// class UsesNoEquality {
+  ///   void Test() {
+  ///     var ca1 = new NoEquality();
+  ///     var ca2 = new NoEquality();
+  ///     if (ca1 != null) { // OK
+  ///       bool condition = ca1 == ca2; // Warning
+  ///     }
+  ///   }
+  /// }
+  /// </code></example>
+  [AttributeUsage(AttributeTargets.Interface | AttributeTargets.Class | AttributeTargets.Struct)]
+  public sealed class CannotApplyEqualityOperatorAttribute : Attribute { }
+
+  /// <summary>
+  /// When applied to a target attribute, specifies a requirement for any type marked
+  /// with the target attribute to implement or inherit specific type or types.
+  /// </summary>
+  /// <example><code>
+  /// [BaseTypeRequired(typeof(IComponent)] // Specify requirement
+  /// class ComponentAttribute : Attribute { }
+  /// 
+  /// [Component] // ComponentAttribute requires implementing IComponent interface
+  /// class MyComponent : IComponent { }
+  /// </code></example>
+  [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
+  [BaseTypeRequired(typeof(Attribute))]
+  public sealed class BaseTypeRequiredAttribute : Attribute
+  {
+    public BaseTypeRequiredAttribute([NotNull] Type baseType)
+    {
+      BaseType = baseType;
+    }
+
+    [NotNull] public Type BaseType { get; private set; }
+  }
+
+  /// <summary>
+  /// Indicates that the marked symbol is used implicitly (e.g. via reflection, in external library),
+  /// so this symbol will not be marked as unused (as well as by other usage inspections).
+  /// </summary>
+  [AttributeUsage(AttributeTargets.All)]
+  public sealed class UsedImplicitlyAttribute : Attribute
+  {
+    public UsedImplicitlyAttribute()
+      : this(ImplicitUseKindFlags.Default, ImplicitUseTargetFlags.Default) { }
+
+    public UsedImplicitlyAttribute(ImplicitUseKindFlags useKindFlags)
+      : this(useKindFlags, ImplicitUseTargetFlags.Default) { }
+
+    public UsedImplicitlyAttribute(ImplicitUseTargetFlags targetFlags)
+      : this(ImplicitUseKindFlags.Default, targetFlags) { }
+
+    public UsedImplicitlyAttribute(ImplicitUseKindFlags useKindFlags, ImplicitUseTargetFlags targetFlags)
+    {
+      UseKindFlags = useKindFlags;
+      TargetFlags = targetFlags;
+    }
+
+    public ImplicitUseKindFlags UseKindFlags { get; private set; }
+    public ImplicitUseTargetFlags TargetFlags { get; private set; }
+  }
+
+  /// <summary>
+  /// Should be used on attributes and causes ReSharper to not mark symbols marked with such attributes
+  /// as unused (as well as by other usage inspections)
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Class | AttributeTargets.GenericParameter)]
+  public sealed class MeansImplicitUseAttribute : Attribute
+  {
+    public MeansImplicitUseAttribute()
+      : this(ImplicitUseKindFlags.Default, ImplicitUseTargetFlags.Default) { }
+
+    public MeansImplicitUseAttribute(ImplicitUseKindFlags useKindFlags)
+      : this(useKindFlags, ImplicitUseTargetFlags.Default) { }
+
+    public MeansImplicitUseAttribute(ImplicitUseTargetFlags targetFlags)
+      : this(ImplicitUseKindFlags.Default, targetFlags) { }
+
+    public MeansImplicitUseAttribute(ImplicitUseKindFlags useKindFlags, ImplicitUseTargetFlags targetFlags)
+    {
+      UseKindFlags = useKindFlags;
+      TargetFlags = targetFlags;
+    }
+
+    [UsedImplicitly] public ImplicitUseKindFlags UseKindFlags { get; private set; }
+    [UsedImplicitly] public ImplicitUseTargetFlags TargetFlags { get; private set; }
+  }
+
+  [Flags]
+  public enum ImplicitUseKindFlags
+  {
+    Default = Access | Assign | InstantiatedWithFixedConstructorSignature,
+    /// <summary>Only entity marked with attribute considered used.</summary>
+    Access = 1,
+    /// <summary>Indicates implicit assignment to a member.</summary>
+    Assign = 2,
+    /// <summary>
+    /// Indicates implicit instantiation of a type with fixed constructor signature.
+    /// That means any unused constructor parameters won't be reported as such.
+    /// </summary>
+    InstantiatedWithFixedConstructorSignature = 4,
+    /// <summary>Indicates implicit instantiation of a type.</summary>
+    InstantiatedNoFixedConstructorSignature = 8,
+  }
+
+  /// <summary>
+  /// Specify what is considered used implicitly when marked
+  /// with <see cref="MeansImplicitUseAttribute"/> or <see cref="UsedImplicitlyAttribute"/>.
+  /// </summary>
+  [Flags]
+  public enum ImplicitUseTargetFlags
+  {
+    Default = Itself,
+    Itself = 1,
+    /// <summary>Members of entity marked with attribute are considered used.</summary>
+    Members = 2,
+    /// <summary>Entity marked with attribute and all its members considered used.</summary>
+    WithMembers = Itself | Members
+  }
+
+  /// <summary>
+  /// This attribute is intended to mark publicly available API
+  /// which should not be removed and so is treated as used.
+  /// </summary>
+  [MeansImplicitUse(ImplicitUseTargetFlags.WithMembers)]
+  public sealed class PublicAPIAttribute : Attribute
+  {
+    public PublicAPIAttribute() { }
+    public PublicAPIAttribute([NotNull] string comment)
+    {
+      Comment = comment;
+    }
+
+    public string Comment { get; private set; }
+  }
+
+  /// <summary>
+  /// Tells code analysis engine if the parameter is completely handled when the invoked method is on stack.
+  /// If the parameter is a delegate, indicates that delegate is executed while the method is executed.
+  /// If the parameter is an enumerable, indicates that it is enumerated while the method is executed.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class InstantHandleAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates that a method does not make any observable state changes.
+  /// The same as <c>System.Diagnostics.Contracts.PureAttribute</c>.
+  /// </summary>
+  /// <example><code>
+  /// [Pure] int Multiply(int x, int y) => x * y;
+  /// 
+  /// void M() {
+  ///   Multiply(123, 42); // Waring: Return value of pure method is not used
+  /// }
+  /// </code></example>
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class PureAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates that the return value of method invocation must be used.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class MustUseReturnValueAttribute : Attribute
+  {
+    public MustUseReturnValueAttribute() { }
+    public MustUseReturnValueAttribute([NotNull] string justification)
+    {
+      Justification = justification;
+    }
+
+    public string Justification { get; private set; }
+  }
+
+  /// <summary>
+  /// Indicates the type member or parameter of some type, that should be used instead of all other ways
+  /// to get the value that type. This annotation is useful when you have some "context" value evaluated
+  /// and stored somewhere, meaning that all other ways to get this value must be consolidated with existing one.
+  /// </summary>
+  /// <example><code>
+  /// class Foo {
+  ///   [ProvidesContext] IBarService _barService = ...;
+  /// 
+  ///   void ProcessNode(INode node) {
+  ///     DoSomething(node, node.GetGlobalServices().Bar);
+  ///     //              ^ Warning: use value of '_barService' field
+  ///   }
+  /// }
+  /// </code></example>
+  [AttributeUsage(
+    AttributeTargets.Field | AttributeTargets.Property | AttributeTargets.Parameter |
+    AttributeTargets.Method)]
+  public sealed class ProvidesContextAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates that a parameter is a path to a file or a folder within a web project.
+  /// Path can be relative or absolute, starting from web root (~).
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class PathReferenceAttribute : Attribute
+  {
+    public PathReferenceAttribute() { }
+    public PathReferenceAttribute([PathReference] string basePath)
+    {
+      BasePath = basePath;
+    }
+
+    public string BasePath { get; private set; }
+  }
+
+  /// <summary>
+  /// An extension method marked with this attribute is processed by ReSharper code completion
+  /// as a 'Source Template'. When extension method is completed over some expression, it's source code
+  /// is automatically expanded like a template at call site.
+  /// </summary>
+  /// <remarks>
+  /// Template method body can contain valid source code and/or special comments starting with '$'.
+  /// Text inside these comments is added as source code when the template is applied. Template parameters
+  /// can be used either as additional method parameters or as identifiers wrapped in two '$' signs.
+  /// Use the <see cref="MacroAttribute"/> attribute to specify macros for parameters.
+  /// </remarks>
+  /// <example>
+  /// In this example, the 'forEach' method is a source template available over all values
+  /// of enumerable types, producing ordinary C# 'foreach' statement and placing caret inside block:
+  /// <code>
+  /// [SourceTemplate]
+  /// public static void forEach&lt;T&gt;(this IEnumerable&lt;T&gt; xs) {
+  ///   foreach (var x in xs) {
+  ///      //$ $END$
+  ///   }
+  /// }
+  /// </code>
+  /// </example>
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class SourceTemplateAttribute : Attribute { }
+
+  /// <summary>
+  /// Allows specifying a macro for a parameter of a <see cref="SourceTemplateAttribute">source template</see>.
+  /// </summary>
+  /// <remarks>
+  /// You can apply the attribute on the whole method or on any of its additional parameters. The macro expression
+  /// is defined in the <see cref="MacroAttribute.Expression"/> property. When applied on a method, the target
+  /// template parameter is defined in the <see cref="MacroAttribute.Target"/> property. To apply the macro silently
+  /// for the parameter, set the <see cref="MacroAttribute.Editable"/> property value = -1.
+  /// </remarks>
+  /// <example>
+  /// Applying the attribute on a source template method:
+  /// <code>
+  /// [SourceTemplate, Macro(Target = "item", Expression = "suggestVariableName()")]
+  /// public static void forEach&lt;T&gt;(this IEnumerable&lt;T&gt; collection) {
+  ///   foreach (var item in collection) {
+  ///     //$ $END$
+  ///   }
+  /// }
+  /// </code>
+  /// Applying the attribute on a template method parameter:
+  /// <code>
+  /// [SourceTemplate]
+  /// public static void something(this Entity x, [Macro(Expression = "guid()", Editable = -1)] string newguid) {
+  ///   /*$ var $x$Id = "$newguid$" + x.ToString();
+  ///   x.DoSomething($x$Id); */
+  /// }
+  /// </code>
+  /// </example>
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Method, AllowMultiple = true)]
+  public sealed class MacroAttribute : Attribute
+  {
+    /// <summary>
+    /// Allows specifying a macro that will be executed for a <see cref="SourceTemplateAttribute">source template</see>
+    /// parameter when the template is expanded.
+    /// </summary>
+    public string Expression { get; set; }
+
+    /// <summary>
+    /// Allows specifying which occurrence of the target parameter becomes editable when the template is deployed.
+    /// </summary>
+    /// <remarks>
+    /// If the target parameter is used several times in the template, only one occurrence becomes editable;
+    /// other occurrences are changed synchronously. To specify the zero-based index of the editable occurrence,
+    /// use values >= 0. To make the parameter non-editable when the template is expanded, use -1.
+    /// </remarks>>
+    public int Editable { get; set; }
+
+    /// <summary>
+    /// Identifies the target parameter of a <see cref="SourceTemplateAttribute">source template</see> if the
+    /// <see cref="MacroAttribute"/> is applied on a template method.
+    /// </summary>
+    public string Target { get; set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
+  public sealed class AspMvcAreaMasterLocationFormatAttribute : Attribute
+  {
+    public AspMvcAreaMasterLocationFormatAttribute(string format)
+    {
+      Format = format;
+    }
+
+    public string Format { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
+  public sealed class AspMvcAreaPartialViewLocationFormatAttribute : Attribute
+  {
+    public AspMvcAreaPartialViewLocationFormatAttribute(string format)
+    {
+      Format = format;
+    }
+
+    public string Format { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
+  public sealed class AspMvcAreaViewLocationFormatAttribute : Attribute
+  {
+    public AspMvcAreaViewLocationFormatAttribute(string format)
+    {
+      Format = format;
+    }
+
+    public string Format { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
+  public sealed class AspMvcMasterLocationFormatAttribute : Attribute
+  {
+    public AspMvcMasterLocationFormatAttribute(string format)
+    {
+      Format = format;
+    }
+
+    public string Format { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
+  public sealed class AspMvcPartialViewLocationFormatAttribute : Attribute
+  {
+    public AspMvcPartialViewLocationFormatAttribute(string format)
+    {
+      Format = format;
+    }
+
+    public string Format { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
+  public sealed class AspMvcViewLocationFormatAttribute : Attribute
+  {
+    public AspMvcViewLocationFormatAttribute(string format)
+    {
+      Format = format;
+    }
+
+    public string Format { get; private set; }
+  }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. If applied to a parameter, indicates that the parameter
+  /// is an MVC action. If applied to a method, the MVC action name is calculated
+  /// implicitly from the context. Use this attribute for custom wrappers similar to
+  /// <c>System.Web.Mvc.Html.ChildActionExtensions.RenderAction(HtmlHelper, String)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Method)]
+  public sealed class AspMvcActionAttribute : Attribute
+  {
+    public AspMvcActionAttribute() { }
+    public AspMvcActionAttribute(string anonymousProperty)
+    {
+      AnonymousProperty = anonymousProperty;
+    }
+
+    public string AnonymousProperty { get; private set; }
+  }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. Indicates that a parameter is an MVC area.
+  /// Use this attribute for custom wrappers similar to
+  /// <c>System.Web.Mvc.Html.ChildActionExtensions.RenderAction(HtmlHelper, String)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class AspMvcAreaAttribute : Attribute
+  {
+    public AspMvcAreaAttribute() { }
+    public AspMvcAreaAttribute(string anonymousProperty)
+    {
+      AnonymousProperty = anonymousProperty;
+    }
+
+    public string AnonymousProperty { get; private set; }
+  }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. If applied to a parameter, indicates that the parameter is
+  /// an MVC controller. If applied to a method, the MVC controller name is calculated
+  /// implicitly from the context. Use this attribute for custom wrappers similar to
+  /// <c>System.Web.Mvc.Html.ChildActionExtensions.RenderAction(HtmlHelper, String, String)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Method)]
+  public sealed class AspMvcControllerAttribute : Attribute
+  {
+    public AspMvcControllerAttribute() { }
+    public AspMvcControllerAttribute(string anonymousProperty)
+    {
+      AnonymousProperty = anonymousProperty;
+    }
+
+    public string AnonymousProperty { get; private set; }
+  }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. Indicates that a parameter is an MVC Master. Use this attribute
+  /// for custom wrappers similar to <c>System.Web.Mvc.Controller.View(String, String)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class AspMvcMasterAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. Indicates that a parameter is an MVC model type. Use this attribute
+  /// for custom wrappers similar to <c>System.Web.Mvc.Controller.View(String, Object)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class AspMvcModelTypeAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. If applied to a parameter, indicates that the parameter is an MVC
+  /// partial view. If applied to a method, the MVC partial view name is calculated implicitly
+  /// from the context. Use this attribute for custom wrappers similar to
+  /// <c>System.Web.Mvc.Html.RenderPartialExtensions.RenderPartial(HtmlHelper, String)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Method)]
+  public sealed class AspMvcPartialViewAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. Allows disabling inspections for MVC views within a class or a method.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
+  public sealed class AspMvcSuppressViewErrorAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. Indicates that a parameter is an MVC display template.
+  /// Use this attribute for custom wrappers similar to 
+  /// <c>System.Web.Mvc.Html.DisplayExtensions.DisplayForModel(HtmlHelper, String)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class AspMvcDisplayTemplateAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. Indicates that a parameter is an MVC editor template.
+  /// Use this attribute for custom wrappers similar to
+  /// <c>System.Web.Mvc.Html.EditorExtensions.EditorForModel(HtmlHelper, String)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class AspMvcEditorTemplateAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. Indicates that a parameter is an MVC template.
+  /// Use this attribute for custom wrappers similar to
+  /// <c>System.ComponentModel.DataAnnotations.UIHintAttribute(System.String)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class AspMvcTemplateAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. If applied to a parameter, indicates that the parameter
+  /// is an MVC view component. If applied to a method, the MVC view name is calculated implicitly
+  /// from the context. Use this attribute for custom wrappers similar to
+  /// <c>System.Web.Mvc.Controller.View(Object)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Method)]
+  public sealed class AspMvcViewAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. If applied to a parameter, indicates that the parameter
+  /// is an MVC view component name.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class AspMvcViewComponentAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. If applied to a parameter, indicates that the parameter
+  /// is an MVC view component view. If applied to a method, the MVC view component view name is default.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Method)]
+  public sealed class AspMvcViewComponentViewAttribute : Attribute { }
+
+  /// <summary>
+  /// ASP.NET MVC attribute. When applied to a parameter of an attribute,
+  /// indicates that this parameter is an MVC action name.
+  /// </summary>
+  /// <example><code>
+  /// [ActionName("Foo")]
+  /// public ActionResult Login(string returnUrl) {
+  ///   ViewBag.ReturnUrl = Url.Action("Foo"); // OK
+  ///   return RedirectToAction("Bar"); // Error: Cannot resolve action
+  /// }
+  /// </code></example>
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Property)]
+  public sealed class AspMvcActionSelectorAttribute : Attribute { }
+
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.Field)]
+  public sealed class HtmlElementAttributesAttribute : Attribute
+  {
+    public HtmlElementAttributesAttribute() { }
+    public HtmlElementAttributesAttribute(string name)
+    {
+      Name = name;
+    }
+
+    public string Name { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Field | AttributeTargets.Property)]
+  public sealed class HtmlAttributeValueAttribute : Attribute
+  {
+    public HtmlAttributeValueAttribute([NotNull] string name)
+    {
+      Name = name;
+    }
+
+    [NotNull] public string Name { get; private set; }
+  }
+
+  /// <summary>
+  /// Razor attribute. Indicates that a parameter or a method is a Razor section.
+  /// Use this attribute for custom wrappers similar to 
+  /// <c>System.Web.WebPages.WebPageBase.RenderSection(String)</c>.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Method)]
+  public sealed class RazorSectionAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates how method, constructor invocation or property access
+  /// over collection type affects content of the collection.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Property)]
+  public sealed class CollectionAccessAttribute : Attribute
+  {
+    public CollectionAccessAttribute(CollectionAccessType collectionAccessType)
+    {
+      CollectionAccessType = collectionAccessType;
+    }
+
+    public CollectionAccessType CollectionAccessType { get; private set; }
+  }
+
+  [Flags]
+  public enum CollectionAccessType
+  {
+    /// <summary>Method does not use or modify content of the collection.</summary>
+    None = 0,
+    /// <summary>Method only reads content of the collection but does not modify it.</summary>
+    Read = 1,
+    /// <summary>Method can change content of the collection but does not add new elements.</summary>
+    ModifyExistingContent = 2,
+    /// <summary>Method can add new elements to the collection.</summary>
+    UpdatedContent = ModifyExistingContent | 4
+  }
+
+  /// <summary>
+  /// Indicates that the marked method is assertion method, i.e. it halts control flow if
+  /// one of the conditions is satisfied. To set the condition, mark one of the parameters with 
+  /// <see cref="AssertionConditionAttribute"/> attribute.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class AssertionMethodAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates the condition parameter of the assertion method. The method itself should be
+  /// marked by <see cref="AssertionMethodAttribute"/> attribute. The mandatory argument of
+  /// the attribute is the assertion type.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class AssertionConditionAttribute : Attribute
+  {
+    public AssertionConditionAttribute(AssertionConditionType conditionType)
+    {
+      ConditionType = conditionType;
+    }
+
+    public AssertionConditionType ConditionType { get; private set; }
+  }
+
+  /// <summary>
+  /// Specifies assertion type. If the assertion method argument satisfies the condition,
+  /// then the execution continues. Otherwise, execution is assumed to be halted.
+  /// </summary>
+  public enum AssertionConditionType
+  {
+    /// <summary>Marked parameter should be evaluated to true.</summary>
+    IS_TRUE = 0,
+    /// <summary>Marked parameter should be evaluated to false.</summary>
+    IS_FALSE = 1,
+    /// <summary>Marked parameter should be evaluated to null value.</summary>
+    IS_NULL = 2,
+    /// <summary>Marked parameter should be evaluated to not null value.</summary>
+    IS_NOT_NULL = 3,
+  }
+
+  /// <summary>
+  /// Indicates that the marked method unconditionally terminates control flow execution.
+  /// For example, it could unconditionally throw exception.
+  /// </summary>
+  [Obsolete("Use [ContractAnnotation('=> halt')] instead")]
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class TerminatesProgramAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates that method is pure LINQ method, with postponed enumeration (like Enumerable.Select,
+  /// .Where). This annotation allows inference of [InstantHandle] annotation for parameters
+  /// of delegate type by analyzing LINQ method chains.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class LinqTunnelAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates that IEnumerable, passed as parameter, is not enumerated.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class NoEnumerationAttribute : Attribute { }
+
+  /// <summary>
+  /// Indicates that parameter is regular expression pattern.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class RegexPatternAttribute : Attribute { }
+
+  /// <summary>
+  /// XAML attribute. Indicates the type that has <c>ItemsSource</c> property and should be treated
+  /// as <c>ItemsControl</c>-derived type, to enable inner items <c>DataContext</c> type resolve.
+  /// </summary>
+  [AttributeUsage(AttributeTargets.Class)]
+  public sealed class XamlItemsControlAttribute : Attribute { }
+
+  /// <summary>
+  /// XAML attribute. Indicates the property of some <c>BindingBase</c>-derived type, that
+  /// is used to bind some item of <c>ItemsControl</c>-derived type. This annotation will
+  /// enable the <c>DataContext</c> type resolve for XAML bindings for such properties.
+  /// </summary>
+  /// <remarks>
+  /// Property should have the tree ancestor of the <c>ItemsControl</c> type or
+  /// marked with the <see cref="XamlItemsControlAttribute"/> attribute.
+  /// </remarks>
+  [AttributeUsage(AttributeTargets.Property)]
+  public sealed class XamlItemBindingOfItemsControlAttribute : Attribute { }
+
+  [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
+  public sealed class AspChildControlTypeAttribute : Attribute
+  {
+    public AspChildControlTypeAttribute(string tagName, Type controlType)
+    {
+      TagName = tagName;
+      ControlType = controlType;
+    }
+
+    public string TagName { get; private set; }
+    public Type ControlType { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Property | AttributeTargets.Method)]
+  public sealed class AspDataFieldAttribute : Attribute { }
+
+  [AttributeUsage(AttributeTargets.Property | AttributeTargets.Method)]
+  public sealed class AspDataFieldsAttribute : Attribute { }
+
+  [AttributeUsage(AttributeTargets.Property)]
+  public sealed class AspMethodPropertyAttribute : Attribute { }
+
+  [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
+  public sealed class AspRequiredAttributeAttribute : Attribute
+  {
+    public AspRequiredAttributeAttribute([NotNull] string attribute)
+    {
+      Attribute = attribute;
+    }
+
+    public string Attribute { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Property)]
+  public sealed class AspTypePropertyAttribute : Attribute
+  {
+    public bool CreateConstructorReferences { get; private set; }
+
+    public AspTypePropertyAttribute(bool createConstructorReferences)
+    {
+      CreateConstructorReferences = createConstructorReferences;
+    }
+  }
+
+  [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
+  public sealed class RazorImportNamespaceAttribute : Attribute
+  {
+    public RazorImportNamespaceAttribute(string name)
+    {
+      Name = name;
+    }
+
+    public string Name { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true)]
+  public sealed class RazorInjectionAttribute : Attribute
+  {
+    public RazorInjectionAttribute(string type, string fieldName)
+    {
+      Type = type;
+      FieldName = fieldName;
+    }
+
+    public string Type { get; private set; }
+    public string FieldName { get; private set; }
+  }
+
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class RazorHelperCommonAttribute : Attribute { }
+
+  [AttributeUsage(AttributeTargets.Property)]
+  public sealed class RazorLayoutAttribute : Attribute { }
+
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class RazorWriteLiteralMethodAttribute : Attribute { }
+
+  [AttributeUsage(AttributeTargets.Method)]
+  public sealed class RazorWriteMethodAttribute : Attribute { }
+
+  [AttributeUsage(AttributeTargets.Parameter)]
+  public sealed class RazorWriteMethodParameterAttribute : Attribute { }
+
+  /// <summary>
+  /// Prevents the Member Reordering feature from tossing members of the marked class.
+  /// </summary>
+  /// <remarks>
+  /// The attribute must be mentioned in your member reordering patterns
+  /// </remarks>
+  [AttributeUsage(AttributeTargets.All)]
+  public sealed class NoReorder : Attribute { }
+}
\ No newline at end of file

HashingTool/ViewModel/HashComponentDataViewModel.cs

+using System;
+using System.ComponentModel;
+using HashingTool.Model;
+
+namespace HashingTool.ViewModel
+{
+	public class HashComponentDataViewModel : ObservableObject, IMainView
+	{
+		private MainWindowViewModel _homeView;
+
+		public HashComponentDataViewModel(MainWindowViewModel homeView)
+		{
+			_homeView = homeView;
+		}
+
+		public string Name
+		{
+			get { return "Hash Component Data"; }
+		}
+	}
+}

HashingTool/ViewModel/IMainView.cs

+namespace HashingTool.ViewModel
+{
+	public interface IMainView
+	{
+		string Name { get; }
+	}
+}

HashingTool/ViewModel/MainWindowViewModel.cs

+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows.Input;
+using HashingTool.Views;
+
+namespace HashingTool.ViewModel
+{
+	public class MainWindowViewModel : ObservableObject
+	{
+		private ICommand _changeViewCommand;
+
+		private IMainView _currentView;
+		private List<IMainView> _availableViews;
+		private ICommand _homeView;
+
+		public MainWindowViewModel()
+		{
+			//var homeView = new HomeViewModel();
+			_availableViews = new List<IMainView> {
+				new HashComponentDataViewModel(this),
+				new VerifyInputDataViewModel(this)
+			};
+
+			CurrentViewModel = _availableViews[0];
+
+			_homeView = new RelayCommand(() => CurrentViewModel = _availableViews[0]);
+		}
+
+		public List<IMainView> MainViewModels
+		{
+			get { return _availableViews ?? (_availableViews = new List<IMainView>()); }
+		}
+
+		public IMainView CurrentViewModel
+		{
+			get { return _currentView; }
+			set {
+				if (_currentView == value) {
+					return;
+				}
+				_currentView = value;
+				RaisePropertyChanged("CurrentViewModel");
+			}
+		}
+
+		public ICommand ChangeViewCommand
+		{
+			get { return _changeViewCommand ?? (_changeViewCommand = new RelayCommand<IMainView>(ChangeViewModel)); }
+		}
+
+		public ICommand ShowHomeView
+		{
+			get { return _homeView; }
+		}
+
+		private void ChangeViewModel(IMainView mainView)
+		{
+			if (!MainViewModels.Contains(mainView)) {
+				return;
+			}
+
+			CurrentViewModel = MainViewModels.FirstOrDefault(mv => mv == mainView);
+		}
+	}
+}

HashingTool/ViewModel/ObservableObject.cs

+using System.ComponentModel;
+
+namespace HashingTool.ViewModel
+{
+	public abstract class ObservableObject : INotifyPropertyChanged
+	{
+		public event PropertyChangedEventHandler PropertyChanged;
+
+		protected void RaisePropertyChanged(string propertyName)
+		{
+			var handler = PropertyChanged;
+			if (handler != null) {
+				handler(this, new PropertyChangedEventArgs(propertyName));
+			}
+		}
+	}
+}

HashingTool/ViewModel/RelayCommand.cs

+//  Original author - Josh Smith - http://msdn.microsoft.com/en-us/magazine/dd419663.aspx#id0090030
+
+using System;
+using System.Diagnostics;
+using System.Windows.Input;
+
+namespace HashingTool.ViewModel
+{
+	/// <summary>
+	/// A command whose sole purpose is to relay its functionality to other objects by invoking delegates. The default return value for the CanExecute method is 'true'.
+	/// </summary>
+	public class RelayCommand<T> : ICommand
+	{
+		#region Declarations
+
+		readonly Predicate<T> _canExecute;
+		readonly Action<T> _execute;
+
+		#endregion
+
+		#region Constructors
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="RelayCommand&lt;T&gt;"/> class.
+		/// </summary>
+		/// <param name="execute">The execution logic.</param>
+		/// <param name="canExecute">The execution status logic.</param>
+		public RelayCommand(Action<T> execute, Predicate<T> canExecute = null)
+		{
+			if (execute == null) {
+				throw new ArgumentNullException("execute");
+			}
+			_execute = execute;
+			_canExecute = canExecute;
+		}
+
+		#endregion
+
+		#region ICommand Members
+
+		public event EventHandler CanExecuteChanged
+		{
+			add {
+				if (_canExecute != null) {
+					CommandManager.RequerySuggested += value;
+				}
+			}
+			remove {
+				if (_canExecute != null) {
+					CommandManager.RequerySuggested -= value;
+				}
+			}
+		}
+
+		[DebuggerStepThrough]
+		public Boolean CanExecute(Object parameter)
+		{
+			return _canExecute == null || _canExecute((T)parameter);
+		}
+
+		public void Execute(Object parameter)
+		{
+			_execute((T)parameter);
+		}
+
+		#endregion
+	}
+
+	/// <summary>
+	/// A command whose sole purpose is to relay its functionality to other objects by invoking delegates. The default return value for the CanExecute method is 'true'.
+	/// </summary>
+	public class RelayCommand : ICommand
+	{
+		#region Declarations
+
+		readonly Func<Boolean> _canExecute;
+		readonly Action _execute;
+
+		#endregion
+
+		#region Constructors
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="RelayCommand&lt;T&gt;"/> class.
+		/// </summary>
+		/// <param name="execute">The execution logic.</param>
+		/// <param name="canExecute">The execution status logic.</param>
+		public RelayCommand(Action execute, Func<Boolean> canExecute = null)
+		{
+			if (execute == null) {
+				throw new ArgumentNullException("execute");
+			}
+			_execute = execute;
+			_canExecute = canExecute;
+		}
+
+		#endregion
+
+		#region ICommand Members
+
+		public event EventHandler CanExecuteChanged
+		{
+			add {
+				if (_canExecute != null) {
+					CommandManager.RequerySuggested += value;
+				}
+			}
+			remove {
+				if (_canExecute != null) {
+					CommandManager.RequerySuggested -= value;
+				}
+			}
+		}
+
+		[DebuggerStepThrough]
+		public Boolean CanExecute(Object parameter)
+		{
+			return _canExecute == null || _canExecute();
+		}
+
+		public void Execute(Object parameter)
+		{
+			_execute();
+		}
+
+		#endregion
+	}
+}

HashingTool/ViewModel/VerifyInputDataViewModel.cs

+namespace HashingTool.ViewModel
+{
+	public class VerifyInputDataViewModel : ObservableObject, IMainView
+	{
+		public VerifyInputDataViewModel(MainWindowViewModel mainWindowViewModel) {}
+
+		public string Name
+		{
+			get { return "Verify Input Data"; }
+		}
+	}
+}

HashingTool/Views/HashComponentData.xaml

+<UserControl x:Class="HashingTool.Views.HashComponentData"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             mc:Ignorable="d" 
+             d:DesignHeight="300" d:DesignWidth="300">
+    <Grid>
+		<Label Content="Hash Component Data" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top"/>
+
+	</Grid>
+</UserControl>

HashingTool/Views/HashComponentData.xaml.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace HashingTool.Views
+{
+	/// <summary>
+	/// Interaction logic for HashComponentData.xaml
+	/// </summary>
+	public partial class HashComponentData : UserControl
+	{
+		public HashComponentData()
+		{
+			InitializeComponent();
+		}
+	}
+}

HashingTool/Views/VerifyInputData.xaml

+<UserControl x:Class="HashingTool.Views.VerifyInputData"
+			xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+			xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+			xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+			xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+			mc:Ignorable="d"
+			d:DesignHeight="300" d:DesignWidth="300">
+	<Grid>
+		<Label Content="Verify Input Data" HorizontalAlignment="Left" Margin="131,115,0,0" VerticalAlignment="Top" />
+
+	</Grid>
+</UserControl>
\ No newline at end of file

HashingTool/Views/VerifyInputData.xaml.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace HashingTool.Views
+{
+	/// <summary>
+	/// Interaction logic for VerifyInputData.xaml
+	/// </summary>
+	public partial class VerifyInputData : UserControl
+	{
+		public VerifyInputData()
+		{
+			InitializeComponent();
+		}
+	}
+}