Question

I am very confused here and not sure if the framework (4.0) supports some of the answers I found so far online.

I have the following structure

public class Form1() 
{

    public int GenerateID(OtherThreadObj oto)
    {
       int result;
       if (this.InvokeRequired)
                {
                    return (int)this.Invoke((MethodInvoker)delegate { GenerateIDSafe(oto); });
                // now this doesn't work obviously. I was looking at .begininvoke, end, etc and got really lost there

                }
                else
                {
               return   GenerateIDSafe(oto);
                }
    }


    private int GenerateIDSafe(OtherThreadObj oto)
    {

    return oto.id.ToSuperID(); // Assume ToSuperID some extension method.

    }

    }

Now the Idea is to call The Generate ID from another Thread and get
that return value.

    public class OtherThreadObj 
    {

    private Form1 parentform;

    private int GetSuperID()
    {

    return parentform.GenerateID(this);

    }
    }

so obviously the above is no good because I don’t get the right return on the .Invoke. I am totally lost on how to do this properly.

Answer 1

You were almost there:

public int GenerateID(OtherThreadObj oto)
{
    int result;
    this.Invoke((MethodInvoker)delegate { result = GenerateIDSafe(oto); });
    return result;
}