BindingExpression.DataItem 属性

定义

命名空间:

System.Windows.Data

程序集:

PresentationFramework.dll

获取此 BindingExpression 使用的绑定源对象。

public:
 property System::Object ^ DataItem { System::Object ^ get(); };

public object DataItem { get; }

member this.DataItem : obj

Public ReadOnly Property DataItem As Object

属性值

Object

此 BindingExpression 使用的绑定源对象。

示例

下面的示例演示事件处理程序的 Click 实现，该事件处理程序使用 GetBindingExpression 方法获取 BindingExpression ，然后调用 DataItem 属性以访问绑定源对象。

TextBlockSavingsText是绑定目标对象，其 Text 属性是绑定目标属性。

private void OnRentRaise(Object sender, RoutedEventArgs args)
{
  // Update bills
  System.Random random = new System.Random();
  double i = random.Next(10);
  BindingExpression bindingExpression =
    BindingOperations.GetBindingExpression(SavingsText, TextBlock.TextProperty);
  SDKSample.NetIncome sourceData = (SDKSample.NetIncome) bindingExpression.DataItem;
  sourceData.Rent = (int)((1 + i / 100) * (double)sourceData.Rent);
}

Private Sub OnRentRaise(ByVal sender As Object, ByVal args As RoutedEventArgs)
    Dim _random As New System.Random()
    Dim num1 As Double = _random.Next(10)
    Dim expression1 As BindingExpression = BindingOperations.GetBindingExpression(Me.SavingsText, TextBlock.TextProperty)
    Dim income1 As NetIncome = DirectCast(expression1.DataItem, NetIncome)
    income1.Rent = CInt(((1 + (num1 / 100)) * income1.Rent))
End Sub