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Control.HasControls Method

Determines if the server control contains any child controls.

Namespace: System.Web.UI
Assembly: System.Web (in system.web.dll)
public virtual bool 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()) {
                 for (int i=0; i < Controls.Count; i++) {
                     Controls[i].RenderControl(writer);
                 }
   }

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);
                 }
   }

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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