HierarchicalDataBoundControl.OnDataPropertyChanged Method
Important
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Called when one of the base data source identification properties is changed, to re-bind the data-bound control to its data.
protected:
override void OnDataPropertyChanged();protected override void OnDataPropertyChanged();override this.OnDataPropertyChanged : unit -> unitProtected Overrides Sub OnDataPropertyChanged ()The following code example demonstrates how a data-bound control can call the OnDataPropertyChanged method if a property that identifies a data source is changed after the data-bound control is initialized. This code example is part of a larger example provided for the HierarchicalDataBoundControl class.
public string DataTextField {
get {
object o = ViewState["DataTextField"];
return((o == null) ? string.Empty : (string)o);
}
set {
ViewState["DataTextField"] = value;
if (Initialized) {
OnDataPropertyChanged();
}
}
}
Public Property DataTextField() As String
Get
Dim o As Object = ViewState("DataTextField")
If o Is Nothing Then
Return String.Empty
Else
Return CStr(o)
End If
End Get
Set(ByVal value As String)
ViewState("DataTextField") = value
If Initialized Then
OnDataPropertyChanged()
End If
End Set
End Property
The OnDataPropertyChanged method is called when the DataSource or DataSourceID is changed any time after the page's PreRender event.
| Produkt | Verzie |
|---|---|
| .NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
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