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Menu::MergeMenu Method

Merges the MenuItem objects of one menu with the current menu.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

virtual void MergeMenu(
	Menu^ menuSrc


Type: System.Windows.Forms::Menu

The Menu whose menu items are merged with the menu items of the current menu.


It was attempted to merge the menu with itself.

This method merges MenuItem objects from one menu with the current menu. MenuItem objects are merged according to the values of the MenuItem::MergeType and MenuItem::MergeOrder properties.

Menu merging is typically done to merge the menus of a Multiple Document Interface (MDI) parent form with those of its active MDI child form. This is performed automatically by the .NET Framework common language runtime. For example, if an MDI parent form contains a set of menus for handling files and your MDI child form also has file-related menu items, the menu sets will automatically merge into a single file menu set when the child form is displayed in the MDI parent form.

You can use the MergeMenu method if you are merging two menu structures that are not part of an MDI application. This implementation can be called by the MainMenu or ContextMenu classes to merge two or more objects that derive from Menu.

To merge two MenuItem objects use the MenuItem::MergeMenu method.

This example creates two menus, mainMenu1 and mainMenu2. The first menu contains one MenuItem, File, and the second contains one MenuItem, Edit. Using the MergeMenu method, mainMenu2 is merged with mainMenu1. When displayed, mainMenu1 will contain the two menu items, File and Edit. This example requires that you have created a Form named Form1.

   void InitializeMyMainMenu()
      // Create the 2 menus and the menu items to add.
      MainMenu^ mainMenu1 = gcnew MainMenu;
      MainMenu^ mainMenu2 = gcnew MainMenu;
      MenuItem^ menuItem1 = gcnew MenuItem;
      MenuItem^ menuItem2 = gcnew MenuItem;

      // Set the caption for the menu items.
      menuItem1->Text = "File";
      menuItem2->Text = "Edit";

      // Add a menu item to each menu for displaying.
      mainMenu1->MenuItems->Add( menuItem1 );
      mainMenu2->MenuItems->Add( menuItem2 );

      // Merge mainMenu2 with mainMenu1
      mainMenu1->MergeMenu( mainMenu2 );

      // Assign mainMenu1 to the form. 
      this->Menu = mainMenu1;

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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