C# MenuItem.MergeOrder属性代码示例

// The following code example demonstrates using the MenuItem 
// Merge-Order property to control the way a merged menu is displayed.

using System.Windows.Forms;

public class Form1:
    System.Windows.Forms.Form

    //Declare a MainMenu object and its items.
{
    internal System.Windows.Forms.MainMenu mainMenu1;
    internal System.Windows.Forms.MenuItem fileItem;
    internal System.Windows.Forms.MenuItem newItem;
    internal System.Windows.Forms.MenuItem openItem;
    internal System.Windows.Forms.MenuItem saveItem;
    internal System.Windows.Forms.MenuItem optionsMenu;
    internal System.Windows.Forms.MenuItem viewItem;
    internal System.Windows.Forms.MenuItem toolsItem;

    // Declare a ContextMenu object and its items.
    internal System.Windows.Forms.ContextMenu contextMenu1;
    internal System.Windows.Forms.MenuItem cutItem;
    internal System.Windows.Forms.MenuItem copyItem;
    internal System.Windows.Forms.MenuItem pasteItem;

    public Form1() : base()
    {        
        this.mainMenu1 = new System.Windows.Forms.MainMenu();
        this.fileItem = new System.Windows.Forms.MenuItem();
        this.newItem = new System.Windows.Forms.MenuItem();
        this.openItem = new System.Windows.Forms.MenuItem();
        this.saveItem = new System.Windows.Forms.MenuItem();

        this.viewItem = new System.Windows.Forms.MenuItem();
        this.toolsItem = new System.Windows.Forms.MenuItem();

        this.optionsMenu = new System.Windows.Forms.MenuItem();
        this.toolsItem = new System.Windows.Forms.MenuItem();
        this.viewItem = new System.Windows.Forms.MenuItem();

        this.contextMenu1 = new System.Windows.Forms.ContextMenu();
        this.cutItem = new System.Windows.Forms.MenuItem();
        this.copyItem = new System.Windows.Forms.MenuItem();
        this.pasteItem = new System.Windows.Forms.MenuItem();

        //Add file menu item and options menu item to the MainMenu.
        this.mainMenu1.MenuItems.AddRange(
            new System.Windows.Forms.MenuItem[]
            {this.fileItem, this.optionsMenu});

        // Initialize the file menu and its contents.
        this.fileItem.Index = 0;
        this.fileItem.Text = "File";
        this.newItem.Index = 0;
        this.newItem.Text = "New";
        this.openItem.Index = 1;
        this.openItem.Text = "Open";
        this.saveItem.Index = 2;
        this.saveItem.Text = "Save";

        // Set the merge order of fileItem to 2 so it has a lower priority 
        // on the merged menu.
        this.fileItem.MergeOrder = 2;

        //Add the new items to the fileItem menu item collection.
        this.fileItem.MenuItems.AddRange(new MenuItem[]
            {this.newItem, this.openItem, this.saveItem});

        // Initalize the optionsMenu item and its contents.
        this.optionsMenu.Index = 1;
        this.optionsMenu.Text = "Options";

        this.viewItem.Index = 0;
        this.viewItem.Text = "View";
        this.toolsItem.Index = 1;
        this.toolsItem.Text = "Tools";

        // Set mergeOrder property to 1, so it has a higher priority than
        // the fileItem on the merged menu.
        this.optionsMenu.MergeOrder = 1;

        //Add view and tool items to the optionsItem menu item.
        this.optionsMenu.MenuItems.AddRange(new MenuItem[]
            {this.viewItem, this.toolsItem});

        // Initialize the menu items for the shortcut menu.
        this.cutItem.Index = 0;
        this.cutItem.Text = "Cut";
        this.cutItem.MergeOrder = 0;
        this.copyItem.Index = 1;
        this.copyItem.Text = "Copy";
        this.copyItem.MergeOrder = 0;
        this.pasteItem.Index = 2;
        this.pasteItem.Text = "Paste";
        this.pasteItem.MergeOrder = 0;

        // Add menu items to the shortcut menu.
        this.contextMenu1.MenuItems.AddRange(new MenuItem[]
            {cutItem, copyItem, pasteItem});

        // Add the mainMenu1 items to the shortcut menu as well, by
        // calling the MergeMenu method.
        contextMenu1.MergeMenu(mainMenu1);

        //Initialize the form.
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Name = "Form1";
        this.Text = "Right click on form for merged menu.";
        
        // Associate the event-handling method with the
        // MouseDown event.
        this.MouseDown +=new MouseEventHandler(Form1_MouseDown);

        // Add mainMenu1 to the form.
        this.Menu = mainMenu1;
    }

    private void Form1_MouseDown(object sender, MouseEventArgs e)
    {

        // Check for a right mouse click.
        if (e.Button==MouseButtons.Right)

            // Display a merged menu containing items from mainMenu1 
            // and contextMenu1.
        {
            contextMenu1.Show(this, new System.Drawing.Point(30, 30));
        }
    }

    [System.STAThreadAttribute]
    public static void Main()
    {
        Application.Run(new Form1());
    }
}