Assembly: System.Web (in system.web.dll)
'Declaration Protected Property RequiresDataBinding As Boolean 'Usage Dim value As Boolean value = Me.RequiresDataBinding Me.RequiresDataBinding = value
/** @property */ protected boolean get_RequiresDataBinding () /** @property */ protected void set_RequiresDataBinding (boolean value)
protected function get RequiresDataBinding () : boolean protected function set RequiresDataBinding (value : boolean)
Property ValueThe returned value is true if the data-bound control's DataBind method should be called before the control is rendered; otherwise, the value is false.
If you set the RequiresDataBinding property to true when the data-bound control has already begun to render its output to the page, the current HTTP request is not a callback, and you are using the DataSourceID property to identify the data source control to bind to, the DataBind method is called immediately. In this case, the RequiresDataBinding property is not actually set to true.
The following code example demonstrates how the RequiresDataBinding property is used by a derived data-bound control class. After data is retrieved by the GetData method and bound to the control with the PerformDataBinding method, the RequiresDataBinding property is set to false and the MarkAsDataBound method is called to signal that the control has completed binding and no longer requires this property during the current page's lifecycle. This code example is part of a larger example provided for the DataBoundControl class.
Protected Overrides Sub PerformSelect() ' Call OnDataBinding here if bound to a data source using the ' DataSource property (instead of a DataSourceID) because the ' data-binding statement is evaluated before the call to GetData. If Not IsBoundUsingDataSourceID Then OnDataBinding(EventArgs.Empty) End If ' The GetData method retrieves the DataSourceView object from the ' IDataSource associated with the data-bound control. GetData().Select(CreateDataSourceSelectArguments(), _ AddressOf OnDataSourceViewSelectCallback) ' The PerformDataBinding method has completed. RequiresDataBinding = False MarkAsDataBound() ' Raise the DataBound event. OnDataBound(EventArgs.Empty) End Sub 'PerformSelect