ContextMenu.Popup 事件

public:
 event EventHandler ^ Popup;

public event EventHandler Popup;

member this.Popup : EventHandler 

Public Custom Event Popup As EventHandler 

事件类型

示例

下面的代码示例为 Popup 该事件的事件处理程序创建一 ContextMenu个事件处理程序。 事件处理程序中的代码确定命名控件和命名textBox1控件PictureBoxpictureBox1中的哪一TextBox个是显示快捷菜单的控件。 根据哪个控件导致ContextMenu显示其快捷菜单，该控件会将相应的MenuItem对象添加到该控件。ContextMenu 此示例要求你具有在窗体中定义的类的实例 ContextMenu （命名 contextMenu1）。 此示例还要求你已向窗体添加一个 TextBox 并 PictureBox 已添加到窗体，并且 ContextMenu 这些控件的属性设置为 contextMenu1。

private:
   void MyPopupEventHandler( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      // Define the MenuItem objects to display for the TextBox.
      MenuItem^ menuItem1 = gcnew MenuItem( "&Copy" );
      MenuItem^ menuItem2 = gcnew MenuItem( "&Find and Replace" );
      // Define the MenuItem object to display for the PictureBox.
      MenuItem^ menuItem3 = gcnew MenuItem( "C&hange Picture" );
      
      // Clear all previously added MenuItems.
      contextMenu1->MenuItems->Clear();

      if ( contextMenu1->SourceControl == textBox1 )
      {
         
         // Add MenuItems to display for the TextBox.
         contextMenu1->MenuItems->Add( menuItem1 );
         contextMenu1->MenuItems->Add( menuItem2 );
      }
      else if ( contextMenu1->SourceControl == pictureBox1 )
      {
         // Add the MenuItem to display for the PictureBox.
         contextMenu1->MenuItems->Add( menuItem3 );
      }
   }

private void MyPopupEventHandler(System.Object sender, System.EventArgs e)
 {
    // Define the MenuItem objects to display for the TextBox.
    MenuItem menuItem1 = new MenuItem("&Copy");
    MenuItem menuItem2 = new MenuItem("&Find and Replace");
    // Define the MenuItem object to display for the PictureBox.
    MenuItem menuItem3 = new MenuItem("C&hange Picture");

    // Clear all previously added MenuItems.
    contextMenu1.MenuItems.Clear();
 
    if(contextMenu1.SourceControl == textBox1)
    {
       // Add MenuItems to display for the TextBox.
       contextMenu1.MenuItems.Add(menuItem1);
       contextMenu1.MenuItems.Add(menuItem2);
    }
    else if(contextMenu1.SourceControl == pictureBox1)
    {
       // Add the MenuItem to display for the PictureBox.
       contextMenu1.MenuItems.Add(menuItem3);
    }
 }

Private Sub MyPopupEventHandler(sender As System.Object, e As System.EventArgs)
    ' Define the MenuItem objects to display for the TextBox.
    Dim menuItem1 As New MenuItem("&Copy")
    Dim menuItem2 As New MenuItem("&Find and Replace")
    ' Define the MenuItem object to display for the PictureBox.
    Dim menuItem3 As New MenuItem("C&hange Picture")
    
    ' Clear all previously added MenuItems.
    contextMenu1.MenuItems.Clear()
    
    If contextMenu1.SourceControl Is textBox1 Then
        ' Add MenuItems to display for the TextBox.
        contextMenu1.MenuItems.Add(menuItem1)
        contextMenu1.MenuItems.Add(menuItem2)
    ElseIf contextMenu1.SourceControl Is pictureBox1 Then
        ' Add the MenuItem to display for the PictureBox.
        contextMenu1.MenuItems.Add(menuItem3)
    End If
End Sub

注解

可以在显示对象之前使用此事件初始化 MenuItem 对象。 例如，如果使用三个ContextMenuTextBox控件，并且想要根据显示快捷菜单的不同禁用某些菜单项ContextMenuTextBox，则可以为此事件创建事件处理程序。 可以使用该SourceControl属性来确定要显示ContextMenu哪些TextBox对象并禁用相应的MenuItem对象。

有关处理事件的详细信息，请参阅 处理和引发事件。