How to detrmine the control that cause ContextMenuStrip

Question

I am very new to .NET and I had to write a program in which there is a TreeView with different kind of nodes, Each kind of node has a different ContextMenuStrip, So I create multiple kind of ContextMenuStrip and assign then to different kind of TreeNode. Now my question is, when user show a context menu how should I find which TreeNode was the node that cause ContextMenuStrip to show. I try to use ContextMenuStrip.SourceControl but it return a TreeView and it never help me, because I know that my source is TreeView I want to know which node of the view! Now should I use some kind of hit test? and if yes what about ContextMenu that shown using keyboard?

Answer 1

You may use Tag property to "link" the source nodes. For example, in your form's Load event handler:

    private void Form1_Load(object sender, EventArgs e)
    {
        TreeNode rootNode = treeView1.Nodes[0];        

        rootNode.Nodes[0].ContextMenuStrip = contextMenuStrip1;
        contextMenuStrip1.Tag = rootNode.Nodes[0];

        rootNode.Nodes[1].ContextMenuStrip = contextMenuStrip2;
        contextMenuStrip2.Tag = rootNode.Nodes[1];
    }

Then you can bind all ContextMenuStrip controls' Opened event handlers to one method, as below:

    private void contextMenuStrip_Opened(object sender, EventArgs e)
    {
        ContextMenuStrip cms = sender as ContextMenuStrip;
        TreeNode aNode = cms.Tag as TreeNode;
        if (aNode != null)
        {
            MessageBox.Show(aNode.Text);
        }
    }

There might be better ways to do it, but I think this should be able to solve your problem.

Updated 2012-10-17:

    private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
    {
        if (e.Button == MouseButtons.Right)
        {
            contextMenuStrip1.Tag = e.Node;
        }
    }

    private void contextMenuStrip1_Opened(object sender, EventArgs e)
    {
        ContextMenuStrip cms = sender as ContextMenuStrip;
        TreeNode aNode = cms.Tag as TreeNode;
        if (aNode == null)
        {
            aNode = treeView1.SelectedNode;
        }
        MessageBox.Show(aNode.Text);
    }

    private void contextMenuStrip1_Closed(object sender, ToolStripDropDownClosedEventArgs e)
    {
        ContextMenuStrip cms = sender as ContextMenuStrip;
        cms.Tag = null;
    }