这里有一个版本。

using System; using System.Diagnostics; #if METRO using Windows.UI.Xaml.Input; using System.Windows.Input; #else using System.Windows.Input; #endif namespace MyToolkit.MVVM { #if METRO public class RelayCommand : NotifyPropertyChanged, ICommand #else public class RelayCommand : NotifyPropertyChanged, ICommand #endif { private readonly Action execute; private readonly Func canExecute; public RelayCommand(Action execute) : this(execute, null) { } public RelayCommand(Action execute, Func canExecute) { if (execute == null) throw new ArgumentNullException("execute"); this.execute = execute; this.canExecute = canExecute; } bool ICommand.CanExecute(object parameter) { return CanExecute; } public void Execute(object parameter) { execute(); } public bool CanExecute { get { return canExecute == null || canExecute(); } } public void RaiseCanExecuteChanged() { RaisePropertyChanged("CanExecute"); if (CanExecuteChanged != null) CanExecuteChanged(this, new EventArgs()); } public event EventHandler CanExecuteChanged; } public class RelayCommand : ICommand { private readonly Action execute; private readonly Predicate canExecute; public RelayCommand(Action execute) : this(execute, null) { } public RelayCommand(Action execute, Predicate canExecute) { if (execute == null) throw new ArgumentNullException("execute"); this.execute = execute; this.canExecute = canExecute; } [DebuggerStepThrough] public bool CanExecute(object parameter) { return canExecute == null || canExecute((T)parameter); } public void Execute(object parameter) { execute((T)parameter); } public void RaiseCanExecuteChanged() { if (CanExecuteChanged != null) CanExecuteChanged(this, new EventArgs()); } public event EventHandler CanExecuteChanged; } } 

如果ICommand在Metro中提供，则没有实现，尽管有几个版本可用，例如CodeProject上的这个版本。

Windows Store应用程序的Prism现在可用，其中包含DelegateCommand（实现ICommand），以及OnPropertyChanged的实现。

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