WPF 精修篇 数据绑定 更新通知

原文: WPF 精修篇 数据绑定 更新通知

开始更新一点有意思的了

首先 数据绑定  其中之一 Element 绑定

看例子

  
  
<Window x:Class= "WpfApplication20.MainWindow"
xmlns= "http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x= "http://schemas.microsoft.com/winfx/2006/xaml"
Title= "MainWindow" Height= "156.383" Width= "246.489" x:Name= "MWindow">
<Grid>
<TextBox HorizontalAlignment= "Left" Height= "23" Margin= "30,48,0,0" TextWrapping= "Wrap" VerticalAlignment= "Top" Width= "120" Text= "{Binding ElementName=MWindow,Path=PresonName}"/>
<TextBlock HorizontalAlignment= "Left" Margin= "30,16,0,0" TextWrapping= "Wrap" VerticalAlignment= "Top" Width= "42" Text= "部门："/>
<Button Content= "提交" HorizontalAlignment= "Left" Margin= "30,85,0,0" VerticalAlignment= "Top" Width= "75" Click= "Button_Click"/>
<Button Content= "重置" HorizontalAlignment= "Left" Margin= "127,85,0,0" VerticalAlignment= "Top" Width= "75" Click= "Button_Click_1"/>
<TextBlock HorizontalAlignment= "Left" Margin= "85,16,0,0" TextWrapping= "Wrap" VerticalAlignment= "Top" Text= "{Binding ElementName=MWindow,Path=Department}"/>

</Grid>
</Window>
 
 

  
  
public partial class MainWindow : Window, INotifyPropertyChanged
{
public MainWindow()
{
InitializeComponent();
}

private string department;

public string Department
{
get { return "软件开发"; }

}
private string presonName;

public string PresonName
{
get { return presonName; }
set { presonName = value;
OnPropertyChanged( "PresonName");
}
}
private void Button_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show( "Hi," + PresonName);
}

private void Button_Click_1(object sender, RoutedEventArgs e)
{
PresonName = "";
}

#region INotifyPropertyChanged 成员

public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string name)
{
if(PropertyChanged!= null){
PropertyChanged.Invoke( this, new PropertyChangedEventArgs(name));
}
}

#endregion
}
 
 

我们在这个例子里有俩个操作

一个是数据绑定

一个是数据通知

绑定 是用Element 指定window 窗体 因为 创建属性以后 window 窗体就有这个属性 通过名字.属性的方式

通知 需要继承 INotifyPropertyChanged

实现接口方法

  public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged(string name) 
        {
            if(PropertyChanged!=null){
            PropertyChanged.Invoke(this,new PropertyChangedEventArgs(name));
            }
        }

在需要通知的属性下面  加上

OnPropertyChanged（“”属性名“”）;

就可以起到通知作用