Treeview Thread

[StephenMcAllister]

Hi, I am wanting to create a Treeview Thread for loading the tree. I tried just calling the procedure that loads it and I got a control invoke issue. I have never created a thread before so I am looking for a sample if possible. Thanks Stephen

[Marc Clifton]

StephenMcAllister wrote: I tried just calling the procedure that loads it and I got a control invoke issue. Controls should be manipulated in the application thread. At best, you can load your data into an in-memory table or some sort of structure using a thread, then populate the tree in the application thread. Marc MyXaml Advanced Unit Testing YAPO

[Luis Alonso Ramos]

There's somenthing you can do. I've not done it, but I'm thinking it might be possible. You can see this article[^] but the main steps are something like this:

// 1. declare a delegate
public delegate void AddTreeNodeHandler(TreeNode node);
...
// 2. handler for the delegate
void myAddTreeNode(TreeNode node)
{
    treeView.Nodes.Add(node);
}
...
// 3. Start the thread (something like this.)
// Pass any control created by main thread and delegate that will add node.
MyThread t = new MyThread(treeView, new AddTreeNodeHandler(myAddTreeNode));
Thread t = new Thread(new ThreadStart(t.ThreadMain));
t.Start();
...
// 4. Thread class
class MyThread
{
    Control ctl;
    AddTreeNodeHandler atn;
    void MyThread(Control ctl, AddTreeNodeHandler atn)
    {
        this.ctl = ctl;  // Save for later user
        this.atn = atn;
    } 
    void ThreadMain()
    {
        while(all nodes you need to add)
        {
            TreeNode node = new TreeNode("text");

            // This will post a call the delegate on the main thread,
            // and not block until it returns. The second parameter is an
            // array that will be passed as the arguments for the delegate.
            ctl.BeginInvoke(atn, new object[] { node });
        }
    }
}

I did it all from the top of my head, without checking docs, and obviously without compiling it, so it might have some mistakes. But it's a good start for what your trying to do. -- LuisR

---

Luis Alonso Ramos Intelectix - Chihuahua, Mexico Not much here: My CP Blog!

[S Senthil Kumar]

This[^] article might help you. Regards Senthil _____________________________ My Blog | My Articles | WinMacro