}publicDelegateCommand(Action<T> execute, Predicate<T>canExecute) {if(execute ==null) {thrownewArgumentNullException("execute"); } _execute=execute; _canExecute=canExecute; }#regionICommand MemberspublicboolCanExecute(objectparameter) {return_canExecute ==null?true: _canExecute((T)parameter); }public...
命令、 RelayCommands 和 EventToCommand:Laurent Bugnion2013 年 5 月文章介紹如何將事件轉換為命令,這對於不實現 ICommandSource 介面的控制項很有用 (msdn.microsoft.com/magazine/dn237302)。 棱鏡框架:棱鏡框架的官方文檔討論 MVVM 模式和 DelegateCommand (bit.ly/1k2Q6sY)。 NuGet 無國籍的包裝:NuGet Web...
_execute=executeValue; _canExecute=canExecuteValue; }publicDelCmd(Action executeValue) :this(executeValue,null) { _execute=executeValue; }publicboolCanExecute(objectparameter) {if(_canExecute ==null) {returntrue; }return_canExecute(parameter); }publicvoidExecute(objectparameter) { _execute(parameter);...
RelayCommand 是中找到的 DelegateCommand 的简化变体,Microsoft 复合应用程序库. relaycommand 类如 图3 所示。 图3 RelayCommand 类 复制 public class RelayCommand : ICommand { #region Fields readonly Action _execute; readonly Predicate _canExecute; #endregion // Fields #region Constructors public...
How to bind different DelegateCommands to button down and button up How to Bind EventArgs and Command Parrameter to Command Event? How to bind image source to resource dictionary in code behind How to bind image to MenuItem.Icon? how to bind list view to a viewModel class in mvvm How to...
最后如果有一个框架能帮助实现我们的 MVVM 代码那就更好了。PRISM 就是其中一个可复用的框架。PRISM 的主要用途是为了提供模块化开发,但是它提供了一个很好的“DelegateCommand”类拿来代替我们自己创建的 command 类。 所以,第一件事情就是从这里下载 PRISM,编译这个解决方案,添加“Microsoft.Practices.Prism.Mvvm.dll...
定义DelegateCommand实现 ICommand public class DelegateCommand : ICommand { public event EventHandler CanExecuteChanged; private readonly Action _executeMethod; private readonly Func_canExecuteMethod; /// Creates a new instance of DelegateCommand with the Action to invoke on execution. ///...
private DelegateCommand _openViewA; private DelegateCommand _openViewB; private DelegateCommand _goBackView; private DelegateCommand _goForwardView; private IModuleInfo _moduleInfo; //导航日志 private IRegionNavigationJournal _navigationJournal; public IView View { get; set; } public string Title { get...
The CommandParameter was mentioned before, and it is a way for the invoker to pass some data along with the command. In this case, notice that I just pass the string that will be passed to the handlers through the StringDelegateCommand. The codebehind of the view (the Window ...
public WatchListService(IMarketFeedService marketFeedService) { this.marketFeedService = marketFeedService; WatchItems = new ObservableCollection<string>(); AddWatchCommand = new DelegateCommand<string>(AddWatch); } In addition to routing commands between the view and a presenter...