WPF：你怎么能在运行时添加一个新的菜单项添加到菜单？ [英] WPF: How can you add a new menuitem to a menu at runtime?

问题描述

我有一个菜单一个简单的WPF应用程序。我需要在运行时动态添加菜单项。当我简单地创建一个新的菜单项，并把它添加到它的父菜单项，它不会在菜单中显示，无论是否UpdateLayout请叫。

要发生什么事？让一个菜单，在运行时动态添加额外的项目

请注意：下面的代码不能正常工作

 菜单项MI =新菜单项（）; 
 mi.Header =项中增加; 
 mi.Visibility = Visibility.Visible; 
 // addTest是存在于定义的菜单
 addTest.Items.Add（英里）的形式一个菜单项; 
 addTest.UpdateLayout（）; 
  

目前，默认的菜单项目在XAML文件中定义。我想添加额外的菜单项到这个菜单和它现有的菜单项。然而，按照规定，上面的代码什么也不做。

解决方案

  //添加到主菜单
菜单项newMenuItem1 =新菜单项（）; 
 newMenuItem1.Header =测试123; 
 this.MainMenu.Items.Add（newMenuItem1）; 
 
 //加入一个子项
菜单项newMenuItem2 =新菜单项（）; 
菜单项newExistMenuItem =（菜单项）this.MainMenu.Items [0]; 
 newMenuItem2.Header =测试456; 
 newExistMenuItem.Items.Add（newMenuItem2）; 
  

I have a simple WPF application with a menu. I need to add menu items dynamically at runtime. When I simply create a new menu item, and add it onto its parent MenuItem, it does not display in the menu, regardless of if UpdateLayout is called.

What must happen to allow a menu to have additional items dynamically added at runtime?

Note: the following code doesn't work.

            MenuItem mi = new MenuItem();
            mi.Header = "Item to add";
            mi.Visibility = Visibility.Visible;
            //addTest is a menuitem that exists in the forms defined menu
            addTest.Items.Add(mi);
            addTest.UpdateLayout();

At the moment, the default menu items are defined in the xaml file. I want to add additional menu items onto this menu and its existing menu items. However, as stated, the above code does nothing.

解决方案

//Add to main menu
MenuItem newMenuItem1 = new MenuItem();
newMenuItem1.Header = "Test 123";
this.MainMenu.Items.Add(newMenuItem1);

//Add to a sub item
MenuItem newMenuItem2 = new MenuItem();
MenuItem newExistMenuItem = (MenuItem)this.MainMenu.Items[0];
newMenuItem2.Header = "Test 456";
newExistMenuItem.Items.Add(newMenuItem2);

这篇关于WPF：你怎么能在运行时添加一个新的菜单项添加到菜单？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！