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C#:当链接到两个不同的对象时,如何检测谁是上下文菜单的菜单项的调用者?

我有两个标签,lblOn 和 lblOff。我将“一个”上下文菜单链接到两个标签以放弃必须制作两个相同的标签。

我将如何找出名为 contextmenu.menuitem 的标签对象?这样点击的 menuitem 就知道它的 contextmenu 是由 lblOn 标签还是 lblOffline 调用的?

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4 回答 4

16

检查. SourceControl_ContextMenuStrip

于 2009-06-10T11:30:30.940 回答
6

漠视。在谷歌搜索了一下之后,我找到了一个解决方案+代码示例。

private void deleteToolStripMenuItem_Click(object sender, EventArgs e)
{
    //Make sure the sender is a ToolStripMenuItem
    ToolStripMenuItem myItem = sender as ToolStripMenuItem;
    if (myItem != null)
    {
        //Get the ContextMenuString (owner of the ToolsStripMenuItem)
        ContextMenuStrip theStrip = myItem.Owner as ContextMenuStrip;
        if (theStrip != null)
        {
            //The SourceControl is the control that opened the contextmenustrip.
            //In my case it could be a linkLabel
            LinkLabel linkLabel = theStrip.SourceControl as LinkLabel;
            if (linkLabel == null)
                MessageBox.Show("Invalid item selected.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            else
            {
                if (MessageBox.Show(string.Format("Are you sure you want to remove BOL {0} from this Job?", linkLabel.Text), "Confirm Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    linkLabel.Text = Program.NullValue(linkLabel);
                }
            }
        }
    }
}

来源: http ://www.tek-tips.com/viewthread.cfm?qid=1441041&page=8

于 2009-06-10T11:48:48.877 回答
2

我知道这是很久以前提出的一个问题,但我真的无法用代码找到一个简单的答案......我知道 SLaks 有点指出了这一点,但我认为那里的其他人需要一个代码示例......

我想知道谁调用了富文本框或标签之间的上下文菜单。原因是我只想要一个上下文菜单,并且如果调用者是富文本框且未选择任何内容,则希望禁用其中的复制按钮。

这是我的代码:

    private void contextMenuStrip1_Opened(object sender, EventArgs e)
    {
        //get the context menu (it holds the caller)
        ContextMenuStrip contextMenu = sender as ContextMenuStrip;
        //get the callers name for testing 
        string controlName = contextMenu.SourceControl.Name;

        //test if it is infact me rich text editor making the call.
        if (controlName == "text_rchtxt")
        {
            //if I have nothing selected... I should not be able to copy
            if (text_rchtxt.SelectedText == "")
                copy_shrtct.Enabled = false; 
        }
        else
        {
            //if I do have something selected or if its another control making the call, enable copying
            copy_shrtct.Enabled = true;
        }
    }
于 2012-09-14T21:20:55.747 回答
-1

用这个:

contextMenuStrip1.SourceControl;
于 2015-09-30T06:18:45.693 回答