Control.Contains 方法

检索一个值,该值指示指定控件是否为一个控件的子控件。

**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms(在 system.windows.forms.dll 中)

语法

声明
Public Function Contains ( _
    ctl As Control _
) As Boolean
用法
Dim instance As Control
Dim ctl As Control
Dim returnValue As Boolean

returnValue = instance.Contains(ctl)
public bool Contains (
    Control ctl
)
public:
bool Contains (
    Control^ ctl
)
public boolean Contains (
    Control ctl
)
public function Contains (
    ctl : Control
) : boolean

参数

返回值

如果指定控件是控件的子控件,则为 true;否则为 false

示例

下面的代码示例通过调用 LabelBringToFront 方法来确保它可见。该示例要求有一个 Form,其上带有名为 panel1Panel 和名为 label1Label

Private Sub MakeLabelVisible()
   ' If the panel contains label1, bring it 
   ' to the front to make sure it is visible. 
   If panel1.Contains(label1) Then
      label1.BringToFront()
   End If
End Sub
private void MakeLabelVisible()
{
   /* If the panel contains label1, bring it 
   * to the front to make sure it is visible. */
   if(panel1.Contains(label1))
   {
      label1.BringToFront();
   }
}
private:
   void MakeLabelVisible()
   {
      
      /* If the panel contains label1, bring it
         * to the front to make sure it is visible. */
      if ( panel1->Contains( label1 ) )
      {
         label1->BringToFront();
      }
   }
private void MakeLabelVisible()
{
    /* If the panel contains label1, bring it 
       to the front to make sure it is visible. 
     */
    if (panel1.Contains(label1)) {
        label1.BringToFront();
    }
} //MakeLabelVisible

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

Control 类
Control 成员
System.Windows.Forms 命名空间
Contains
Controls
Parent