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BaseDataBoundControl.RequiresDataBinding Property

Note: This property is new in the .NET Framework version 2.0.

Gets or sets a value indicating whether the DataBind method should be called.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

protected bool RequiresDataBinding { get; set; }
/** @property */
protected boolean get_RequiresDataBinding ()

/** @property */
protected void set_RequiresDataBinding (boolean value)

protected function get RequiresDataBinding () : boolean

protected function set RequiresDataBinding (value : boolean)

Property Value

The 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 override void PerformSelect() {            

   // Call OnDataBinding here if bound to a data source using the
   // DataSource property (instead of a DataSourceID), because the
   // databinding statement is evaluated before the call to GetData.       
    if (! IsBoundUsingDataSourceID) {
        OnDataBinding(EventArgs.Empty);
    }            
    
    // The GetData method retrieves the DataSourceView object from  
    // the IDataSource associated with the data-bound control.            
    GetData().Select(CreateDataSourceSelectArguments(), 
        OnDataSourceViewSelectCallback);
    
    // The PerformDataBinding method has completed.
    RequiresDataBinding = false;
    MarkAsDataBound();
    
    // Raise the DataBound event.
    OnDataBound(EventArgs.Empty);
}

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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