Using of threads to update labels after receiving string from bluetooth
Hi all i have a thread that is able to read data being received across from bluetooth stream. On the sender part i made it a while loop where count keeps on increasing + 1. I did a messagebox.show(test); and it works fine but when i do a label.text = test i get :
"Control.Invoke must be used to interact with controls created on a separate thread." error. My follow code in C# :
Thread t = new Thread(new ThreadStart(readStream)); t.Start(); public void readStream() { while (true) { String test = manager.Reader.ReadLine(); label1.Text = test; } }
My question is , how do i update the label in a thread? Any simple ways with control invoke?
Hello here is an example how to do this:
http://msdn.microsoft.com/en-us/library/ms171728.aspx
You should use a function similar to this one if you want to update a label from another thread. You cannot update it directly.
In short: you should write something like this:
delegate void SetTextCallback(string text); private void SetText(string text) { // InvokeRequired required compares the thread ID of the // calling thread to the thread ID of the creating thread. // If these threads are different, it returns true. if (this.textBox1.InvokeRequired) { SetTextCallback d = new SetTextCallback(SetText); this.Invoke(d, new object[] { text }); } else { this.textBox1.Text = text; } }链接地址: http://www.djcxy.com/p/57926.html
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