C# ContextMenu，上下文菜单，在窗体正文区点击右键弹出的菜单，支持多层次显示的右键菜单，大多数的窗体都具备类似的菜单效果，在C#中使用这种菜单，也是比较基本的吧，因此本例子对C#初学者来说，可能比较实用吧。-C# ContextMenu, context menu, right-click in the text area form the pop-up menu, support for multi-level display the context menu, most of the forms all have similar menu effect, use this menu in C#, but also the more basic right Therefore, this example of a C# beginners, it may be more practical.