MVVM Light framework (MVVM Mode)

The MVVM Light framework is an MVVM mode implementation for WPF and silverlight development. The following briefly summarizes the framework.

[The following is based on Silverlights4]

MVVM Light Composition

The current framework has two library files.

GalaSoft. MvvmLight Library

ViewModelBase: basic class of View Model, VM implementation in MVVM

Messenger: messages transmitted between ViewModel and View. Note that some frequently used Message Processing classes have been predefined in the GalaSoft. MvvmLight. Messaging namespace of the system,

Such as DialogMessage, icationicationmessageaction, notifmessmessagewithcallback, etc.

Command: Command, RelayCommand, language and Interface Element response binding

GalaSoft. MvvmLight. Extras Library

EventToCommand: bind Command with XAML, used in Expression4

DispatcherHelper: multi-thread processing

Install and use MVVM Light

GalaSoft.MvvmLight.Binaries.V3.zip

Decompress the package to the system's Program files directory.

GalaSoft.MvvmLight.Templates.V3.VS10.zip

Copy the Silverlight content under ItemTemplates ProjectTemplates to the corresponding

C: \ Users \ Administrator \ Documents ents \ Visual Studio 2010 \ Templates

In this case, the MVVM light Template under Silverlight can be selected for the New Project. However, this template is relatively simple.

General Project usage:

1. Add GalaSoft. MvvmLight. SL4.dll GalaSoft. MvvmLight. Extras. SL4.dll reference

2. Add ViewModelLocator to App. xaml. Of course, you do not need to use the code or MEF to bind the View and ViewModel.

Xmlns: vm = "clr-namespace: MvvmLight1.ViewModel"

<vm:ViewModelLocator x:Key="Locator d:IsDataSource="True" />

3. Add ViewModel and View

At this point:

ViewModel: Add Command implementation, send messages, and View transmission information

View: Data Binding, Command binding, message registration, and ICleanup are enabled for ViewModel clearing and registering message cleaning, interface and interaction design.

For the initialization association between View and ViewModel, you can use ViewModelLocator. cs to establish and bind [this form is still somewhat troublesome]. Of course, you can also use IOC such as MEF for automatic injection.

You can use

DataContext = "{Binding Main, Source = {StaticResource Locator}", you can also use code to bind [the Locator here is declared in App. xaml]

MVVM Light instance

Message Registration	It is generally registered in View to respond to messages in ViewModel. Of course, it can also be registered elsewhere. Messenger.Default.Register(this, OnReadOnlyIssueMessage); Messenger.Default.Register<Brush>(this, true, m => BackgroundBrush = m);
Message sending	Messenger.Default.Send(new CommandMessage(Notifications.NotifyShutdown)); Messenger.Default.Send<Brush, MainViewModel>(savedSettings.ApplicationBackgroundBrush);
Command Definition	public RelayCommand ShutdownCommand         {             get;             private set;         }   public MainViewModel()         {             if (IsInDesignMode)             {                            }             else             {                                ShutdownCommand = new RelayCommand(ShutdownService.RequestShutdown);             }         } RemoveFileCommand = new RelayCommand<Data.Web.File>(g => this.OnRemoveFileCommand(g), g => g != null);
Command binding	<Button  Content="Shut" Command="{Binding Path= ShutdownCommand }" />   …        Command="{Binding Path=RemoveFileCommand}"        CommandParameter="{Binding SelectedItem, ElementName=listBox_Files}"
ICLeanup MEF	public partial class AllIssues : UserControl, ICleanup     {         public AllIssues()         {             InitializeComponent();             if (!ViewModelBase.IsInDesignModeStatic)             {                 // Use MEF To load the View Model                 CompositionInitializer.SatisfyImports(this);             }         }         [Import(ViewModelTypes.AllIssuesViewModel)]         public object ViewModel         {             set             {                 DataContext = value;             }         }    public void Cleanup()         {             // call Cleanup on its ViewModel             ((ICleanup)this.DataContext).Cleanup();             // call Cleanup on IssueEditor             this.issueEditor.Cleanup();             // Cleanup itself             Messenger.Default.Unregister(this);         }
DispatcherHelper	GalaSoft. MvvmLight. Test (SL). csproj in the source code TestDispatcherHelper. cs details
ViewModel	Inherit the class corresponding to the view from ViewModelBase