c# - 动态添加上下文菜单项

Question

由于某种原因，无论将toolstripmenuitem添加到上下文菜单多少次，它总是说上下文菜单不包含该项目。

ToolStripMenuItem Colour = new ToolStripMenuItem("Colour");

ctmFile.Show(Cursor.Position);
Selecteditem = lvFiles.FocusedItem.Text.ToString();
if (lvFiles.FocusedItem.ImageKey.ToString() == "Folder")
{

    if (ctmFile.Items.Contains(Colour) == false)
    {
        ctmFile.Items.Add(Colour);
    }

}
else
{
    if(ctmFile.Items.Contains(Colour))
    {
        ctmFile.Items.Remove(Colour);
    }
}

Answer 1

只是为了在 Ed 的答案之上添加，我建议使用键:

ctmFile.Show(Cursor.Position);
Selecteditem = lvFiles.FocusedItem.Text.ToString();
if (lvFiles.FocusedItem.ImageKey.ToString() == "Folder")
{

    if (!ctmFile.Items.ContainsKey("Colour")) 
    {
        ToolStripMenuItem Colour = new ToolStripMenuItem("Colour");
        Colour.Name= "Colour"; //Add a name (key) to your menu.
        ctmFile.Items.Add(Colour);
    }

}
else
{
    if (ctmFile.Items.ContainsKey("Colour")) 
    {
        ctmFile.Items.RemoveByKey("Colour");
    }
}