Determines if the server control contains any child controls.
Public Overridable Function HasControls As Boolean
Dim instance As Control Dim returnValue As Boolean returnValue = instance.HasControls()
public virtual bool HasControls()
public: virtual bool HasControls()
public function HasControls() : boolean
Since this method simply determines if any child controls exist, it can enhance performance by allowing you to avoid an unnecessary Count property call. Calls to this property require a ControlCollection object to be instantiated. If there are no children, this object creation wastes server resources.
The HasControls method should be overridden only to change metadata attributes such as EditorBrowsableAttribute. For more information about using attributes, see Extending Metadata Using Attributes.
The following example uses the HasControls method to determine if any controls exist before using the Count property to iterate through a ControlCollection object.
If HasControls() Then Dim i As Integer For i = 0 To Controls.Count - 1 Controls(i).RenderControl(writer) Next i End If
if (HasControls()) { for (int i=0; i < Controls.Count; i++) { Controls[i].RenderControl(writer); } }
if (HasControls()) { for (var i : int = 0; i < Controls.Count; i++) { Controls[i].RenderControl(writer); } }
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98