一、自定义命令
自定义命令必须要实现ICommand接口，如下代码所示：

/// <summary>
/// 自定义的清除命令。光脚丫思考 2014-7-31 06:51:32
/// </summary>
public class ClearCommand : ICommand
{
    public bool CanExecute(object parameter)
    {
        throw new NotImplementedException();
    }

    /// <summary>
    /// 当命令可执行状态发生改变时，应激发该事件。
    /// </summary>
    public event EventHandler CanExecuteChanged;

    /// <summary>
    /// 命令被执行，执行与业务相关的Clear逻辑。
    /// </summary>
    /// <param name="parameter">执行命令的目标对象。</param>
    public void Execute(object parameter)
    {
        IView view = parameter as IView;
        if (view != null) view.Clear();
    }
}

/// <summary>
/// 自定义命令源。崔有来 2014-7-31 06:54:26
/// </summary>
public class MyCommandSource : UserControl, ICommandSource
{
    public ICommand Command { get; set; }
    public object CommandParameter { get; set; }
    public System.Windows.IInputElement CommandTarget { get; set; }

    protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
    {
        base.OnMouseLeftButtonDown(e);

        // 在命令目标上执行命令。
        if (this.CommandTarget != null && this.Command != null)
            this.Command.Execute(this.CommandTarget);
    }
}

ClearCommand ClearCmd = new ClearCommand();
this.MyCommandSource1.Command = ClearCmd;
this.MyCommandSource1.CommandTarget = this.MiniView1;

WPF自定义命令Command