TreeNode.Toggle 方法

将树节点切换为展开或折叠状态。

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

语法

声明
Public Sub Toggle
用法
Dim instance As TreeNode

instance.Toggle

public void Toggle ()

public:
void Toggle ()

public void Toggle ()

public function Toggle ()

备注

将树节点切换为与当前状态相反的状态（展开或折叠）。

提示

保持 TreeNode 的状态。例如，如果下一级子节点原来未折叠，则在调用 Expand 方法时，子节点将显示为原来展开的状态。

示例

下面的代码示例在用户右击 TreeNode 时移除它，而当用户在其上单击鼠标轮时将它从展开切换到折叠。本示例要求有一个含有 TreeView 控件的 Form。TreeView 应该有两个或更多根树节点，而且每个根树节点至少有一个子节点。

Private Sub treeView1_MouseDown(sender As Object, _
  e As MouseEventArgs) Handles treeView1.MouseDown
   Select Case e.Button
      ' Remove the TreeNode under the mouse cursor 
      ' if the right mouse button was clicked. 
      Case MouseButtons.Right
         treeView1.GetNodeAt(e.X, e.Y).Remove()
      
      ' Remove the TreeNode under the mouse cursor 
      ' if the middle mouse button (mouse wheel) was clicked. 
      Case MouseButtons.Middle
         treeView1.GetNodeAt(e.X, e.Y).Toggle()
   End Select
End Sub

private void treeView1_MouseDown(object sender, MouseEventArgs e)
{
   switch(e.Button)
   {
      // Remove the TreeNode under the mouse cursor 
      // if the right mouse button was clicked. 
      case MouseButtons.Right:
         treeView1.GetNodeAt(e.X, e.Y).Remove();
         break;
      
      // Remove the TreeNode under the mouse cursor 
      // if the middle mouse button (mouse wheel) was clicked. 
      case MouseButtons.Middle:
         treeView1.GetNodeAt(e.X, e.Y).Toggle();
         break;
   }
}

private:
   void treeView1_MouseDown( Object^ /*sender*/, MouseEventArgs^ e )
   {
      switch ( e->Button )
      {
         case ::MouseButtons::Right:
            treeView1->GetNodeAt( e->X, e->Y )->Remove();
            break;

         // Remove the TreeNode under the mouse cursor
         // if the middle mouse button (mouse wheel) was clicked.
         case ::MouseButtons::Middle:
            treeView1->GetNodeAt( e->X, e->Y )->Toggle();
            break;
      }
   }

private void treeView1_MouseDown(Object sender, MouseEventArgs e)
{
    switch (e.get_Button()) {
        // Remove the TreeNode under the mouse cursor 
        // if the right mouse button was clicked. 
        case MouseButtons.Right:
            treeView1.GetNodeAt(e.get_X(), e.get_Y()).Remove();
            treeView1.GetNodeAt(e.get_X(), e.get_Y()).Remove();
            break;

        // Remove the TreeNode under the mouse cursor 
        // if the middle mouse button (mouse wheel) was clicked. 
        case get_MouseButtons().Middle:
            treeView1.GetNodeAt(e.get_X(), e.get_Y()).Toggle();
            break;
    }
} //treeView1_MouseDown

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

.NET Compact Framework

受以下版本支持：2.0、1.0

请参见

参考

TreeNode 类
TreeNode 成员
System.Windows.Forms 命名空间
Expand
ExpandAll
Collapse
IsExpanded