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。