IContainerControl 接口
为某控件提供功能，使其用作其他控件的父级。
**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）
语法
声明
Public Interface IContainerControl
用法
Dim instance As IContainerControl
public interface IContainerControl
public interface class IContainerControl
public interface IContainerControl
public interface IContainerControl
备注
给实现者的说明 在这些希望成为控件集合的父级的类中实现该接口。该接口的成员使您能够激活子控件，或确定哪个控件当前是活动的。当在类中实现时，ActivateControl 将 Control 用作参数并激活指定控件。ActiveControl 属性激活或检索活动控件。 在大多数常见情况下，您不必直接实现该接口。例如，如果创建一个 Windows 控件库项目，Visual Studio 会为您创建一个初始类。该类从 UserControl 类中继承而来，并且 UserControl 可为您实现 IContainerControl。
示例
下面的示例从 ScrollableControl 类继承，并实现 IContainerControl 接口。将实现添加到 ActiveControl 属性和 ActivateControl 方法。
Imports System
Imports System.Windows.Forms
Imports System.Drawing
Public Class MyContainerControl
Inherits ScrollableControl
Implements IContainerControl
Private myActiveControl As Control
Public Sub New()
' Make the container control Blue so it can be distinguished on the form.
Me.BackColor = Color.Blue
' Make the container scrollable.
Me.AutoScroll = True
End Sub
' Add implementation to the IContainerControl.ActiveControl property.
Public Property ActiveControl() As Control Implements IContainerControl.ActiveControl
Get
Return Me.myActiveControl
End Get
Set
' Make sure the control is a member of the ControlCollection.
If Me.Controls.Contains(value) Then
Me.myActiveControl = value
End If
End Set
End Property
' Add implementation to the IContainerControl.ActivateControl(Control) method.
public Function ActivateControl(active As Control) As Boolean Implements IContainerControl.ActivateControl
If Me.Controls.Contains(active) Then
' Select the control and scroll the control into view if needed.
active.Select()
Me.ScrollControlIntoView(active)
Me.myActiveControl = active
Return True
End If
Return False
End Function
End Class
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;
}
}
using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;
public ref class MyContainer: public ScrollableControl, public 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;
}
property Control^ ActiveControl
{
// Add implementation to the IContainerControl.ActiveControl property.
virtual Control^ get()
{
return activeControl;
}
virtual void set( Control^ value )
{
// 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.
virtual 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;
}
};
import System.*;
import System.Windows.Forms.*;
import System.Drawing.*;
public class MyContainer extends ScrollableControl implements IContainerControl
{
private Control activeControl;
public MyContainer()
{
// Make the container control Blue so it can be
// distinguished on the form.
this.set_BackColor(Color.get_Blue());
// Make the container scrollable.
this.set_AutoScroll(true);
} //MyContainer
// Add implementation to the IContainerControl.ActiveControl property.
/** @property
*/
public Control get_ActiveControl()
{
return activeControl;
} //get_ActiveControl
/** @property
*/
public void set_ActiveControl(Control value)
{
// Make sure the control is a member of the ControlCollection.
if (this.get_Controls().Contains(value)) {
activeControl = value;
}
} //set_ActiveControl
// Add implementations to the IContainerControl.
// ActivateControl(Control) method.
public boolean ActivateControl(Control active)
{
if (this.get_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;
} //ActivateControl
} //MyContainer
平台
Windows 98、Windows 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
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
请参见
参考
IContainerControl 成员
System.Windows.Forms 命名空间
ContainerControl 类
Control 类