WPF data binding articles refinement Update Notification

Original: WPF data binding finishing papers Update Notifications

Interestingly, the point to start the update

First Data Binding One of the Element Binding

See examples

  
  
<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
}
 
 

We have two operations in this example

A data binding

A data notification

Element Binding is specified window because the window after window to create a form has this attribute by attribute name. How properties

Notification needs to inherit INotifyPropertyChanged

Implement an interface method

  public event PropertyChangedEventHandler PropertyChanged;

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

In the properties need to be informed of the following plus

OnPropertyChanged ( "" property name "");

They can play the role of the notification