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    WPF中界面全部都用XAML显示相应的控件，确切来说，WPF是想让WINFORM界面的开发像网页开发一样。在Winform中只要控件名.属性=设置的属性值，那么在WPF中不用再这么麻烦了。这里就说说数据绑定的用法吧。界面上有很多要显示后台数据的控件，后台数据改变了，那么如何让界面数据也实时发生改变呢？这就用到绑定。

/// 
    /// NotiyObject必须实现INotifyPropertyChanged接口    /// 
    public abstract class NotifyProperty : INotifyPropertyChanged    {        public event PropertyChangedEventHandler PropertyChanged;        public void OnChangedProperties(string propertyName)        {            if (this.PropertyChanged != null)            {                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));            }        }    }

2、页面显示的数据模型类

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel;using System.Windows;namespace TestAttributeDependency.BindData{    public class MainFormDataModel : NotifyProperty    {        private string textBoxContent = string.Empty;        private Visibility btnShowContent = Visibility.Visible;        private Visibility btnClearContent = Visibility.Collapsed;        /// 
        /// 文本框内显示的内容        /// 
        public string TextBoxContent        {            get            {                return this.textBoxContent;            }            set            {                this.textBoxContent = value;                //必须调用该事件才能完成前台相应绑定内容的改变                //而且propertyName最好和绑定的对象名称一致                this.OnChangedProperties(@"TextBoxContent");            }        }        /// 
        /// 显示内容按钮是否显示        /// 
        public Visibility BtnShowContent        {            get            {                return this.btnShowContent;            }            set            {                this.btnShowContent = value;                this.OnChangedProperties(@"BtnShowContent");            }        }        /// 
        /// 清空内容按钮是否显示        /// 
        public Visibility BtnClearContent        {            get             {                 return btnClearContent;            }            set             {                btnClearContent = value;                this.OnChangedProperties(@"BtnClearContent");            }        }    }}

3、界面的后台声明数据模型对象

using System.Windows;using TestAttributeDependency.BindData;namespace TestAttributeDependency{    /// 
    /// MainWindow.xaml 的交互逻辑    /// 
    public partial class MainWindow : Window    {        /// 
        /// 需要绑定的对象        /// 
        internal MainFormDataModel mainFormDataModel = new MainFormDataModel();        /// 
        /// 构造函数        /// 
        public MainWindow()        {            InitializeComponent();            this.DataContext = this.mainFormDataModel;//绑定，这句才实现了绑定            InitializeCutom();        }        /// 
        /// 自定义初始化        /// 
        void InitializeCutom()        {            mainFormDataModel.TextBoxContent = string.Empty;            mainFormDataModel.BtnShowContent = System.Windows.Visibility.Visible;            mainFormDataModel.BtnClearContent = System.Windows.Visibility.Collapsed;        }        /// 
        /// 显示内容按钮点击事件        /// 
        ///         ///         private void btnShowContent_Click(object sender, RoutedEventArgs e)        {            mainFormDataModel.TextBoxContent = @"哈哈，按钮被点击了！";            //通过Visibility控制控件的显示            mainFormDataModel.BtnShowContent = Visibility.Collapsed;            mainFormDataModel.BtnClearContent = Visibility.Visible;        }        /// 
        /// 清空内容按钮点击事件        /// 
        ///         ///         private void btnClearContent_Click(object sender, RoutedEventArgs e)        {            if (this.txtShowContent.Text.Length > 0)            {                this.txtShowContent.Text = string.Empty;            }            mainFormDataModel.BtnShowContent = Visibility.Visible;            mainFormDataModel.BtnClearContent = Visibility.Collapsed;        }    }}

4、前台界面的写法

完成后效果如下：

点击“显示内容”按钮，TextBox中显示内容，并且“显示内容”按钮隐藏，"清空内容"按钮显示；点击"清空内容"按钮则相反。

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