委托具有多个签名的方法

Question

How do I add a method with signature to a thread?

I'm trying to add an item to TreeView GUI using a method testAdd(DirectoryEntry d, TreeNode t)

I did it as normal creation of a thread:

Thread t1;
t1 = new Thread(new ThreadStart(testAdd(directory,rootNode));t1.Start();
t1=new Thread(delegate() {testAdd(directory, rootNode);})
t1.start();

I get error telling me to use invoke.

How can this be solved?

Answer 1

The problem you're running into is that you can't access UI elements from a background thread in a WinForms application. There is nothing wrong with the signature you're using you're just doing an illegal operation on the UI element. The actual mutation of the UI element must occur on the UI / Main thread of the application. A new Thread instance guarantees this won't be true.

It's possible to do the work to calculate what you will add on a background thread and then use Invoke to get back to the UI thread. But the actual add must happen on the UI.