RichTextBox实现鼠标右键(剪切，复制，粘贴)功能

private static void InitRichTextBoxContextMenu(RichTextBox textBox)

{

//创建剪切子菜单

var cutMenuItem = new System.Windows.Forms.MenuItem("剪切");

cutMenuItem.Click += (sender, eventArgs) => textBox.Cut();

//创建复制子菜单

var copyMenuItem = new System.Windows.Forms.MenuItem("复制");

copyMenuItem.Click += (sender, eventArgs) => textBox.Copy();

//创建粘贴子菜单

var pasteMenuItem = new System.Windows.Forms.MenuItem("粘贴");

pasteMenuItem.Click += (sender, eventArgs) => textBox.Paste();

//创建右键菜单并将子菜单假日到右键菜单中

var contextMenu = new ContextMenu();

contextMenu.MenuItems.Add(cutMenuItem);

contextMenu.MenuItems.Add(copyMenuItem);

contextMenu.MenuItems.Add(pasteMenuItem);

textBox.ContextMenu = contextMenu;

}