/// <summary>/// Delegatecommand，这种WPF.SL都可以用，VIEW里面直接使用INTERACTION的trigger激发。比较靠谱，适合不同的UIElement控件/// </summary>public class DelegateCommand : ICommand{Func<object, bool> canExecute;Action<object> executeAction;bool canExecuteCache;public DelegateCommand(Action<object> executeAction, Func<object, bool> canExecute){this.executeAction = executeAction;this.canExecute = canExecute;}#region ICommand Memberspublic bool CanExecute(object parameter){bool temp = canExecute(parameter);if (canExecuteCache != temp){canExecuteCache = temp;if (CanExecuteChanged != null){CanExecuteChanged(this, new EventArgs());}}return canExecuteCache;}public event EventHandler CanExecuteChanged;public void Execute(object parameter){executeAction(parameter);}#endregion}

public class TestViewModels:INotifyPropertyChanged
{public TestViewModels(){......cm1click = new DelegateCommand(cm1Click,Cancm1Click);   //初始化delegatecommand}....//DelegateCommand#region command1public ICommand cm1click { get; set; }public void cm1Click(object param){MessageBox.Show("CM1 clicked!");}private bool Cancm1Click(object param){return true;}#endregion command1......
}

<Button x:Name="BTN_CM1" Content="DelegateCommand" Height="115" Width="148" ><i:Interaction.Triggers><i:EventTrigger EventName="Click"><i:InvokeCommandAction Command="{Binding cm1click}"/></i:EventTrigger></i:Interaction.Triggers></Button>

public class RelayCommand<T> : ICommand{public RelayCommand(Action<T> execute): this(execute, null){}public RelayCommand(Action<T> execute, Predicate<T> canExecute){if (execute == null)throw new ArgumentNullException("execute");_execute = execute;_canExecute = canExecute;}[DebuggerStepThrough]public bool CanExecute(object parameter){return _canExecute == null ? true : _canExecute((T)parameter);}public event EventHandler CanExecuteChanged{add{}remove{} //add//{//    if (_canExecute != null)//        CommandManager.RequerySuggested += value;//}//remove//{//    if (_canExecute != null)//        CommandManager.RequerySuggested -= value;//}}public void Execute(object parameter){_execute((T)parameter);}readonly Action<T> _execute = null;readonly Predicate<T> _canExecute = null;bool ICommand.CanExecute(object parameter){throw new NotImplementedException();}event EventHandler ICommand.CanExecuteChanged{add { throw new NotImplementedException(); }remove { throw new NotImplementedException(); }}void ICommand.Execute(object parameter){throw new NotImplementedException();}}

public class RelayCommand : ICommand{public RelayCommand(Action execute): this(execute, null){}public RelayCommand(Action execute, Func<bool> canExecute){if (execute == null)throw new ArgumentNullException("execute");_execute = execute;_canExecute = canExecute;}[DebuggerStepThrough]public bool CanExecute(object parameter){return _canExecute == null ? true : _canExecute();}public event EventHandler CanExecuteChanged{   //这里把实现注释掉了，这样在SL下面也可以用。add { }remove { }//add//{//    if (_canExecute != null)//        CommandManager.RequerySuggested += value;//}//remove//{//    if (_canExecute != null)//        CommandManager.RequerySuggested -= value;//}}public void Execute(object parameter){_execute();}readonly Action _execute;readonly Func<bool> _canExecute;}

<Button x:Name="BTN_CM2" Content="Command2" Height="103" HorizontalAlignment="Left" Margin="115,123,0,0" VerticalAlignment="Top" Width="109" Command="{Binding command2}" />

private ICommand _command2;public ICommand command2{get{if (this._command2 == null){this._command2 = new RelayCommand(() => this.cm2Click(),() => this.Cancm2Click);}return this._command2;}set { }}public bool Cancm2Click{get { return true; }}public void cm2Click(){MessageBox.Show("CM2 Clicked!");}