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IContainerControl Interface

Provides the functionality for a control to act as a parent for other controls.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public interface IContainerControl

The IContainerControl type exposes the following members.

  NameDescription
Public propertyActiveControlGets or sets the control that is active on the container control.
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  NameDescription
Public methodActivateControlActivates a specified control.
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Notes to Implementers

Implement this interface in classes that you want to parent a collection of controls. The members of this interface allow you to activate a child control, or determine which control is currently active. When implemented in a class, ActivateControl takes a Control as a parameter and activates the specified control. The ActiveControl property activates or retrieves the control that is active.

In most common scenarios, you do not need to directly implement this interface. For example, if you create a Windows Control Library project, Visual Studio generates an initial class for you. That class inherits from the UserControl class, and UserControl implements IContainerControl for you.

The following example inherits from the ScrollableControl class and implements the IContainerControl interface. Implementation is added to the ActiveControl property and the ActivateControl method.


using System;
using System.Windows.Forms;
using System.Drawing;

	public class MyContainer : ScrollableControl, IContainerControl
	{
		private Control activeControl;
		public MyContainer() 
		{
			// Make the container control Blue so it can be distinguished on the form.
			this.BackColor = Color.Blue;
			
			// Make the container scrollable.
			this.AutoScroll = true;
		}

		// Add implementation to the IContainerControl.ActiveControl property.
		public Control ActiveControl
		{
			get
			{
				return activeControl;
			}

			set
			{
				// Make sure the control is a member of the ControlCollection.
				if(this.Controls.Contains(value))
				{
					activeControl = value;
				}
			}
		}

		// Add implementations to the IContainerControl.ActivateControl(Control) method.
		public bool ActivateControl(Control active)
		{
			if(this.Controls.Contains(active))
			{
				// Select the control and scroll the control into view if needed.
				active.Select();
				this.ScrollControlIntoView(active);
				this.activeControl = active;
				return true;
			}
			return false;
		}
	}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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