C#:当链接到两个不同的对象时,如何检测谁是上下文菜单菜单项的调用者?

时间:2009-06-10 11:27:22

标签: c# .net winforms contextmenu menuitem

C#:当链接到两个不同的对象时,如何检测谁是上下文菜单菜单项的调用者?

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,以丢弃必须制作两个相同的标签。

我如何找出名为contextmenu.menuitem的标签对象?这样点击菜单项就知道是不是它的上下文菜单是由lblOn标签还是lblOffline调用的?

4 个答案:

答案 0 :(得分:15)

检查SourceControl的{​​{1}}属性。

答案 1 :(得分:6)

否认。谷歌搜索后,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

答案 2 :(得分:2)

我知道这是许多月前的一个问题,但我真的找不到 一个简单的代码答案...... 我知道SLaks有点指出,但我认为其他人需要代码示例......

我想知道在富文本框或标签之间调用上下文菜单的人。 原因是我只想要一个上下文菜单,并希望其中的复制按钮 如果调用者是未选中任何内容的富文本框,则禁用。

继承我的代码:

    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;
        }
    }

答案 3 :(得分:-1)

使用它:

contextMenuStrip1.SourceControl;

样品:

using (MemoryStream ms = new MemoryStream())
{
    Chart chartx = (Chart)stripChart.SourceControl;
    chartx.SaveImage(ms, ChartImageFormat.Png);
    Bitmap bm = new Bitmap(ms);
    Clipboard.SetImage(bm);
}