BindingExpression.DataItem Properti

Definisi

Ruang nama:

System.Windows.Data

Rakitan:

PresentationFramework.dll

Mendapatkan objek sumber pengikatan yang digunakan ini BindingExpression .

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

public object DataItem { get; }

member this.DataItem : obj

Public ReadOnly Property DataItem As Object

Nilai Properti

Object

Objek sumber pengikatan yang digunakan ini BindingExpression .

Contoh

Contoh berikut menunjukkan implementasi Click penanganan aktivitas yang menggunakan GetBindingExpression metode untuk mendapatkan BindingExpression lalu memanggil DataItem properti untuk mengakses objek sumber pengikatan.

TextBlockSavingsText adalah objek target pengikatan, dan propertinya Text adalah properti target pengikatan.

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