CODEWITHSUNDEEP
c#multithreading
UnderPaidIntern
UnderPaidIntern

Reputation: 59

Thread was in an invalid state for the operation being executed. c#

I have an app which crashes when trying to open a SaveFileDialog. I searched for answers and I found that I needed to put this in a new thread, and that's what I did but I had an error about the STA. So I put 

th.SetApartmentState(ApartmentState.STA);

After few issues, I managed to make the thread work but now I have

Thread was in an invalid state for the operation being executed.

This is my Thread function : 

public static void ouvrir(object name)
{
    saveFileDialog1.Filter = "Microsoft Word Document (.docx)|*.docx";
    saveFileDialog1.RestoreDirectory = true;
    saveFileDialog1.Title = "Where to save the " + (string)name + " ? ";
    DialogResult result = saveFileDialog1.ShowDialog();
    oke = true;
    try
    {
        if (result == DialogResult.OK)
        {
            boule = true;
            ptth = saveFileDialog1.FileName;
        }
    }
    catch (Exception exc)
    { MessageBox.Show(exc.Message); }
}

This line thows the error (I save a word doc using interop): 

doc.SaveAs(imp);

I googled the error but it seems that i'm the only one on earth to have this issue... This is way out of my understanding, I sail in an ocean of doubt and ignorance.

Thank you

Upvotes: 1

Views: 1188

Answers (1)

EventHorizon
EventHorizon

Reputation: 2986

You must show the dialog on the same thread you used to create the form, so you shouldn't use a thread here at all. If you need to invoke the save dialog from a worker thread, use the Invoke method to execute the code on the UI thread.

Example: How to update the GUI from another thread in C#?

Here's some more information from MSDN: Control.InvokeRequired Property

Upvotes: 1

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