Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
HasChildren Property
Collapse the table of content
Expand the table of content

Control.HasChildren Property

Gets a value indicating whether the control contains one or more child controls.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public bool HasChildren { get; }
/** @property */
public boolean get_HasChildren ()

public function get HasChildren () : boolean

Not applicable.

Property Value

true if the control contains one or more child controls; otherwise, false.

If the Controls collection has a Count greater than zero, the HasChildren property will return true. Accessing the HasChildren property does not force the creation of a Control.ControlCollection if the control has no children, so referencing this property can provide a performance benefit when walking a tree of controls.

The following code example sets the BackColor and ForeColor of the controls to the default system colors. The code recursively calls itself if the control has any child controls. This code example requires that you have a Form with at least one child control; however, a child container control, like a Panel or GroupBox, with its own child control(s) would better demonstrate the recursion.

// Reset all the controls to the user's default Control color. 
private void ResetAllControlsBackColor(Control control)
{
   control.BackColor = SystemColors.Control;
   control.ForeColor = SystemColors.ControlText;
   if(this.HasChildren)
   {
      // Recursively call this method for each child control.
      foreach(Control childControl in control.Controls)
      {
         ResetAllControlsBackColor(childControl);
      }
   }
}

// Reset all the controls to the user's default Control color. 
private void ResetAllControlsBackColor(Control control)
{
    control.set_BackColor(SystemColors.get_Control());
    control.set_ForeColor(SystemColors.get_ControlText());
    if (this.get_HasChildren()) {
        for (int iCtr=0; iCtr < control.get_Controls().get_Count(); iCtr++) {
            // Recursively call this method for each child control.
            Control childControl = control.get_Controls().get_Item(iCtr);
            ResetAllControlsBackColor(childControl);
        }
    }
} //ResetAllControlsBackColor

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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

Community Additions

ADD
Show:
© 2015 Microsoft