Tài liệu Adding Menus and Processing Menu Events ppt

Adding Menus and Processing Menu Events

Microsoft Visual Studio 2005 lets you add menus and menu items to a form in two ways.

You can use the Visual Studio 2005 integrated development environment (IDE) and the

menu editor to create a menu graphically. You can also write code that creates a

MenuStrip object (MenuStrip is a class defined in the Windows Forms library), and then

add ToolStripMenuItem objects to it (ToolStripMenuItem is another class in the

Windows Forms library).

Laying out a menu is only half of the story. When a user clicks a command on a menu,

the user expects something to happen! You activate the commands by trapping menu

events and executing code in much the same way as you do for handling control events.

Creating a Menu

In the following exercise, you will use the graphical approach to create menus for the

Middleshire Bell Ringers Association application. We will cover how to manipulate and

create menus programmatically later in this chapter.

Create the File menu

1. Start Visual Studio 2005.

2. Open the BellRingers project, located in the \Microsoft Press\Visual CSharp Step

by Step\Chapter 21\BellRingers folder in your My Documents folder. This is the

Middleshire Bell Ringers application. It should be the same as the version that you

completed in Chapter 20.

3. Display MemberForm in the Design View window. (Click MemberForm.cs in the

Solution Explorer, and then click Designer on the View menu, or double-click

MemberForm.cs in the Solution Explorer).

MemberForm appears.

4. In the Toolbox, expand the Menus & Toolbars category. Drag a MenuStrip control

anywhere onto MemberForm.

IMPORTANT

Be sure to drop the MenuStrip control onto the form, and not onto a control on the

form. Some controls, such as GroupBox, can have their own menus, and dropping

a menu on such a control will create a menu for that control only.