Control.HasControls Method
.NET Framework 3.0
Determines if the server control contains any child controls.
Namespace: System.Web.UI
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
'Declaration Public Overridable Function HasControls As Boolean 'Usage Dim instance As Control Dim returnValue As Boolean returnValue = instance.HasControls
public boolean HasControls ()
public function HasControls () : boolean
Not applicable.
Return Value
true if the control contains other controls; otherwise, false.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.
Notes to Inheritors: 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 < get_Controls().get_Count(); i++) {
get_Controls().get_Item(i).RenderControl(writer);
}
}
if (HasControls()) { for (var i : int = 0; i < Controls.Count; i++) { Controls[i].RenderControl(writer); } }
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