菲佣WPF——2(ViewModel binding RouteEvent)

在ViewModel中绑定RouteEvent,参考国外的大牛，自娱自乐写了一个。

1：XAML  代码

<Window x:Class="WpfApplication4.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:local="clr-namespace:WpfApplication4"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="MainWindow" Height="350" Width="525">

    <Grid>

        <CheckBox Width="100" Height="20" Content="Demo CheckBox" local:CheckBoxBehavior.Click="{Binding DemoClick}" />

    </Grid>

</Window>

2：ViewModel 代码

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Input;



namespace WpfApplication4

{

    public class MainWindowsViewModel

    {

        #region << Property >>

        public ICommand DemoClick { get; set; }

        #endregion



        #region << Constructor >>

        public MainWindowsViewModel()

        {

            DemoClick = new DeletegateCommand(DemoMethod);

        }

        #endregion



        #region << Method >>

        public void DemoMethod()

        {

            MessageBox.Show("Demo CheckBox Click");

        }



        public bool CanDemoMethod()

        {

            return false;

        }

        #endregion



    }

}

3：CheckBoxBehavior 代码

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Input;



namespace WpfApplication4

{

    public static class CheckBoxBehavior

    {

        #region << Property >>

        public static readonly DependencyProperty ClickProperty = DependencyProperty.RegisterAttached("Click", typeof(ICommand), typeof(CheckBoxBehavior), new UIPropertyMetadata(null,ClickCallBack));



        public static ICommand GetClick(DependencyObject obj)

        {

            return (ICommand)obj.GetValue(ClickProperty);

        }



        public static void SetClick(DependencyObject obj,ICommand cmd)

        {

            obj.SetValue(ClickProperty, cmd);

        }

        #endregion



        #region << Method >>

        private static  void ClickCallBack(DependencyObject obj, DependencyPropertyChangedEventArgs e)

        {

            if (obj is CheckBox)

            {

                var checkBox = obj as CheckBox;



                if (e.NewValue != null)

                {

                    checkBox.Click += ClickEvent;

                }

                else

                {

                    checkBox.Click -= ClickEvent;

                }

            }

        }



        static void ClickEvent(object sender, RoutedEventArgs e)

        {

            var cmd = GetClick(sender as CheckBox);



            if (cmd != null)

            {

                cmd.Execute(null);

            }



        }

        #endregion

    }

}

 

用了这么多代码来实现绑定RouteEvent事件，很多人说着又必要吗。

写这么多代码有意义吗，，，

那请想下为什么用WPF，UI开发的目的是什么？

UI最终的目的是UI和逻辑分离。

写这么多其实就是为了逻辑和Ui分离。