c#--wpf数据绑定binding_c# content="{binding}-优快云博客

本文介绍了一个使用 WPF 的 Binding 特性进行数据绑定的例子。通过实例代码展示了如何将 UI 控件与 ViewModel 中的数据进行绑定，并实现了数据的双向更新。具体包括 XAML 文件中 Button 的 Content 属性绑定到 ViewModel 中的 cd 类属性，以及点击事件触发数据更改的过程。

xaml

<Window x:Class="测试binding.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:测试binding"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <StackPanel>
        <Button Content="{Binding Path=aa}" ></Button>      //banding  aa    当cd类的name值改变时在view层显示
        <DockPanel Height="100">
            <Button Content="liushaui" Click="btn"></Button>   //写了个click事件来改变数据
        </DockPanel>
    </StackPanel>
</Window>

MainWindow.xaml.cs

using System;
using System.Windows;

namespace 测试binding
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        private cd cd = new cd();   //将cd binding类 实例化

        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = this.cd;   //设置数据源为cd 类的

       
        }



        private void btn(object sender, RoutedEventArgs e)
        {
            Random r = new Random();
              int i=  r.Next();
            cd.name = i.ToString();   //改变cd类的 name  的值
            
        }
    }


    public class cd: DependencyObject
    {


        public static DependencyProperty nameProperty;
        public string name
        {
            #region
            get
            {
                return (string)GetValue(nameProperty);
            }
            set
            {
                SetValue(nameProperty , value);
            }
            #endregion
        }

        public event DependencyPropertyChangedEventHandler OnDependencyPropertyChanged;
        protected static void PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            #region
            cd mn = (cd)d;

            if (mn.OnDependencyPropertyChanged != null)
            {
                mn.OnDependencyPropertyChanged(d, e);
            }
            #endregion
        }


        static cd()
        {

            FrameworkPropertyMetadata metadata = new  FrameworkPropertyMetadata("");   //默认值为空
            metadata.PropertyChangedCallback = new PropertyChangedCallback(PropertyChanged);
            cd.nameProperty = DependencyProperty.Register("aa", typeof(string), typeof(cd), metadata);  //生成 aa binding

        }


        public cd()
        {
            #region
            this.name ="aaaaaa";    // 这个是初始值
            #endregion
        }



    }

 
   
}