Question

I have the following piece of code:

delegate string CD();
void MyFunction()
{
    stringBuilder.Append((CD)delegate()
    {
        switch(whatever)
        {
            case 1 : return "A";
            ...
            default: return "X";
        }
    });
}

But the stringBuilder appends text MyNamespace.MyClass+CD instead of A or X. Why does this happen?

Answer 1

You have declared a delegate of type CD within your call to Append and ToString() is called on it which returns the type name by default i.e. “MyNamespace.MyClass+CD”.

You need to invoke the delegate to get it to evaluate, e.g.:

    void MyFunction()
    {
        stringBuilder.Append(((CD)delegate
        {
            switch (whatever)
            {
                case 1:
                    return "A";
                    ...
                default:
                    return "X";
            }
        }).Invoke());
    }