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如果某個類屬性是雙向綁定到文本框的文本屬性,那麼當更改文本框中的文本時,該類的「PropertyChanged」事件應該開火嗎?它不符合我的情況 - 當我更改文本框內容時,消息框永遠不會彈出。如果屬性更改文本框更改,則綁定仍然有效,反之亦然。Silverlight PropertyChanged事件未在雙向文本框綁定中觸發
編輯:現在我意識到它會觸發,但只有當文本框失去焦點。我想這背後必然有一個原因。
代碼:
public class BaselineAreas : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private double _Impervious = 0;
public double Impervious
{
get { return _Impervious; }
set
{
if (value != this._Impervious)
{
_Impervious = value;
NotifyPropertyChanged("Impervious");
}
}
}
private double _Pervious = 0;
public double Pervious
{
get { return _Pervious; }
set
{
if (value != this._Pervious)
{
_Pervious = value;
NotifyPropertyChanged("Pervious");
}
}
}
public void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
private BaselineAreas baselineAreas = new BaselineAreas();
public MainPage()
{
InitializeComponent();
baselineAreas.Impervious = 100;
baselineAreas.Pervious = 500;
textBoxTotalImperviousArea.DataContext = baselineAreas;
textBoxTotalPerviousArea.DataContext = baselineAreas;
baselineAreas.PropertyChanged += new PropertyChangedEventHandler(baselineAreas_PropertyChanged);
}
void baselineAreas_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
MessageBox.Show(baselineAreas.Impervious.ToString());
}
的XAML:
<TextBox Height="23" HorizontalAlignment="Left" Margin="138,16,0,0" Name="textBoxTotalImperviousArea" VerticalAlignment="Top" Width="62"
Text="{Binding Impervious, Mode=TwoWay}"/>
<TextBox Height="23" HorizontalAlignment="Right" Margin="0,45,226,0" Name="textBoxTotalPerviousArea" VerticalAlignment="Top" Width="62"
Text="{Binding Pervious, Mode=TwoWay}"/>
感謝Boluc。這非常有幫助! – xyk 2013-04-07 11:54:45