// 摘要:     //     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'. This class does not allow you to accept command parameters in     //     the Execute and CanExecute callback methods.     public class RelayCommand : ICommand     {         // 摘要:         //     Initializes a new instance of the RelayCommand class that can always execute.          public RelayCommand(Action execute);         //         // 摘要:         //     Initializes a new instance of the RelayCommand class.          public RelayCommand(Action execute, Func<bool> canExecute);          // 摘要:         //     Occurs when changes occur that affect whether the command should execute.         public event EventHandler CanExecuteChanged;          // 摘要:         //     Defines the method that determines whether the command can execute in its         //     current state.          [DebuggerStepThrough]         public bool CanExecute(object parameter);         //         // 摘要:         //     Defines the method to be called when the command is invoked.          public void RaiseCanExecuteChanged();     }

public RelayCommand<string> GotoView1         {             get;             set;         }

  public void GoToView11(string msg)  {         System.Windows.MessageBox.Show(msg + "Go to View1");  }

//对这个方法属性赋值,test只是形式参数，无任何意义，意思是把字符串类型的test传递给GotoView方法GotoView1 = new RelayCommand<string>((test) => GoToView11(test));

            <HyperlinkButton x:Name="View1" Grid.Row="1" Content="Go to View1" Command="{Binding GotoView1}" CommandParameter="Hello" ></HyperlinkButton>