如何禁用菜單條子菜單

Question

我需要動態禁用菜單項的子子項。這裏在菜單欄中如果我運行啓動時，禁用啓動選項應該禁用如何實現這一點。我已附上快照參考

// Run At Startup 
private void runAtStartupToolStripMenuItem_Click(object sender, EventArgs e) 
{ 
    rkApp.SetValue("TimeCalculation", "\"" + Application.ExecutablePath.ToString() + "\""); 
    Environment.GetFolderPath(Environment.SpecialFolder.Startup); 
    menuStrip1.Items["disableStartupToolStripMenuItem"].Enabled = false; 

} 

//Disable Startup 
private void disableStartupToolStripMenuItem_Click(object sender, EventArgs e) 
{ 
    rkApp.DeleteValue("TimeCalculation", false); 
    menuStrip1.Items["runAtStartupToolStripMenuItem"].Enabled = false; 
} 

快照：

Answer 1

使用標誌：

private bool flag = true; 

private void runAtStartupToolStripMenuItem_Click(object sender, EventArgs e) 
{ 
    //... 
    flag = true; 
} 

private void disableStartupToolStripMenuItem_Click(object sender, EventArgs e) 
{ 
    //... 
    flag = false; 
} 

然後使用DropDownOpening事件啓用/禁用的項目。

private void bToolStripMenuItem_DropDownOpening(object sender, EventArgs e) { 
    runAtStartupToolStripMenuItem.Enabled = !flag; 
    disableStartupToolStripMenuItem.Enabled = flag; 
} 

如果你想隱藏的項目使用Available：

runAtStartupToolStripMenuItem.Available= !flag; 
    disableStartupToolStripMenuItem.Available= flag;