Question

I am currently developing a WCF Publish Subscribe service. The subscriber is a winform app. As the subscriber needs to implement the callback method for the service, which in my case is the PostReceived() method, and the publisher has the PublishPost() method.

For the PostReceived() method for my winform, it is unable to access the UI thread of my winform. The subscribe method is done on my main method. How do I program my PostReceived() method in such a way that it is able to access the labels and such of my mainForm?

EDIT

what I have tried so far is calling the mainForm object from my program.cs but it crashes when i run all 3 , stating the error that it is unable to access the UI thread.

EDIT 2

I have tried using the following code but there is an error for it.

mainForm b;   
public void PostReceived(string postSampleData)
    {
        b.BeginInvoke((MethodInvoker)delegate()
        {
            b.lblSearch.Text = "lakjslkaja";
        });

After running the code, there is an error of

Object reference not set to an instance of an object.

Any idea how to fix it?

Answer 1

Your PostReceived method should be something like this

void PostReceived()
        {
            yourform.BeginInvoke((MethodInvoker)delegate()
                {
                    yourform.button.Text = "new label";
                    //More stuff here
                });
        }

This will guarantee that all the stuff after BeginInvoke is invoked in the UI thread.