problem accessing a control from a thread (the callback is in another user defined class)

[George Nistor]

Hi, I have a custom class CReadCDD where I intend to do some processing. I placed the callbacks also inside this class (like mLoadXmlOnHeap_WorkThread). From the Form class I instantiate my CReadCDD class and create the thread with call to mLoadXmlOnHeap_WorkThread. In mLoadXmlOnHeap_WorkThread (not to have an additional proprty for the Form, I send an event to the Form class with the text I want as event args); the event is received in the Forms class, it goes to mfHandleCustomEvent_PrintRichTextConsole but here after entering in Invoke method IT BLOCK my Form. The richtext control is not updated. Where I did the mistake? I read the MSDN but still I have problem to access the control from my thread :) George

public class CReadCDD
{
	//Fields
	private CProcessXMLdoc mdoc;
	private string mFileName;
	public  RichTextBox pRichTextBox1 {get; set;}
	
	//private Form1 myForm;

	// Declare the event using EventHandler<T>
    public event EventHandler<CCustomEventArgs> RaiseCustomEvent;

    protected void pOnRaiseCustomEvent(CCustomEventArgs pEv)
    {
    	EventHandler<CCustomEventArgs> handler = RaiseCustomEvent;
		
    	// Event will be null if there are no subscribers
        if (handler != null)
            handler(this, pEv);
    }

	
    public CReadCDD(string pFileName, Form1 pForm)
	{
   	//mDelSetText= mSetText;
   	
	mFileName= 	pFileName;   	
	//myForm= pForm;
	}

	    	
    #region Worker Threads
    public void mLoadXmlOnHeap\_WorkThread()
    {
    	mdoc = new CProcessXMLdoc(mFileName);
    	
    	CCustomEventArgs evObj= new CCustomEventArgs("Load The XML Data from Cdd file on the HEAP\\n");
    	
    	pOnRaiseCustomEvent(evObj);
    }
	
	// ......................................
}

namespace CddToCaplDiagnosticTestsGenerator
{
public partial class Form1 : Form
{

    private CReadCDD objReadCdd;   
    public delegate void DelegateTypePrntText(string text);
    public DelegateTypePrntText mdelT;	
      	
	public Form1()
    {
		mdelT = new DelegateTypePrntText(mSetTextToRichTextControl);
		InitializeComponent();
    }
	
	// Define what actions to take when the event is raised.
	void mfHandleCustomEvent\_PrintRichTextConsole(object sender, CCustomEventArgs e)
	{
		byte debug=0;
		
		string

[Covean]

After the first look I would say thrdLoadXmlOnHeap.Join(); is your problem. After you started your thread from your main/guithread your main/guithread waits for the end of the thread you started. This blocks your ui. At first I would try just to comment this line out.

Greetings Covean

[George Nistor]

Yep... thx

[Covean]

You are welcome.

Greetings Covean