动态禁用特定上下文菜单项

本文关键字：上下文 菜单项 动态 | 更新日期: 2023-09-27 18:20:08

我在上下文菜单中添加了4个菜单。如果在启动过程中单击上下文菜单项，如何禁用特定的("Start")菜单项？

ContextMenu conMenu1 = new ContextMenu();
public Form1()
{
            InitializeComponent();
    conMenu1.MenuItems.Add("Start", new System.EventHandler(this.Start_Click));
    conMenu1.MenuItems.Add("Pause", new System.EventHandler(this.Pause_Click));
    conMenu1.MenuItems.Add("Resume", new System.EventHandler(this.Resume_Click));
    conMenu1.MenuItems.Add("Stop", new System.EventHandler(this.Stop_Click));
}
private void Start_Click(object sender, EventArgs e)
{
    // Functionalities to disable start context menu item
}

动态禁用特定上下文菜单项

您可以这样做。处理上下文菜单。打开事件

private void conMenu1_Opening(object sender, CancelEventArgs e)
{
    conMenu1.Items[0].Enabled= false;
}

使用PopUp事件，如

申报

var trayMenu = new ContextMenu();
trayMenu.Popup += MenuOpening;
trayMenu.MenuItems.Add(...);
...

订阅事件

private void MenuOpening(object sender, EventArgs e)
{         
    var cm = sender as ContextMenu;
    if (cm != null)
         cm.MenuItems[0].Enabled = false;
}
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