WPF 自定义一个控件，当点击按钮是触发到ViewModel(业务逻辑部分)和Xaml路由事件(页面逻辑部分)

Posted 2020-11-23 搬砖的L先生

#region - 用于绑定ViewModel部分 -

    public ICommand Command
    {
        get { return (ICommand)GetValue(CommandProperty); }
        set { SetValue(CommandProperty, value); }
    }

    // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty CommandProperty =
        DependencyProperty.Register("Command", typeof(ICommand), typeof(MyUserControl), new PropertyMetadata(default(ICommand)));
    
    public object CommandParameter
    {
        get { return (object)GetValue(CommandParameterProperty); }
        set { SetValue(CommandParameterProperty, value); }
    }

    // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty CommandParameterProperty =
        DependencyProperty.Register("CommandParameter", typeof(object), typeof(MyUserControl), new PropertyMetadata(default(object)));

    public IInputElement CommandTarget { get; set; }

    #endregion

region 用于Xaml触发路由事件部分

    //声明和注册路由事件
    public static readonly RoutedEvent MyEventRoutedEvent =
        EventManager.RegisterRoutedEvent("MyEvent", RoutingStrategy.Bubble, typeof(EventHandler<RoutedEventArgs>), typeof(MyUserControl));
    //CLR事件包装
    public event RoutedEventHandler MyEvent
    {
        add { this.AddHandler(MyEventRoutedEvent, value); }
        remove { this.RemoveHandler(MyEventRoutedEvent, value); }
    }

    //激发路由事件,借用Click事件的激发方法

    protected void OnMyEvent()
    {
        RoutedEventArgs args = new RoutedEventArgs(MyEventRoutedEvent, this);
        this.RaiseEvent(args);
    }

    #endregion

///

内部触发的路由事件和自定义命令方法

private void Button_Click(object sender, RoutedEventArgs e)
{
//命令作用于命令目标
if (this.Command != null)
{
this.Command.Execute(CommandParameter);

            this.OnMyEvent();
        }
    }

<local:MyUserControl Grid.Row="1" Command="{Binding RelayCommand}" CommandParameter="Sumit">
<local:MyUserControl.Triggers>



<DoubleAnimation Storyboard.TargetProperty="Opacity" From="0" To="1" BeginTime="00:00:00" Duration="00:00:01"/>



</local:MyUserControl.Triggers>