Question

I am trying to get an item[i] to a string from a ListView. I just don’t seem to understand what I am supposed to do, when the ListView is on another thread.

public delegate void getCurrentItemCallBack (int location);
...
private void runAsThread()
{
   While (..>i)
   {
    //I tried the following //Doesn't work.
    //string item_path = listView.Item[i].toString();   

    //attempting thread safe. How do I get it to return a string?
    string item_path = GetCurrentItem(i);
   }
}
private void GetCurrentItem(int location)
{
   if (this.listViewModels.InvokeRequired)
      {
       getCurrentItemCallback d = new getCurrentItemCallback(GetCurrentItem);
       this.Invoke(d, new object[] { location });
      }
      else
      {
       this.listViewModels.Items[location].ToString();
      }
}

What am I missing?

Answer 1

You need to have a delegate type that returns a string, not a void, to begin with.

Then, you need the matching method to return a string as well.

public delegate string getCurrentItemCallBack (int location);

...

private string GetCurrentItem(int location)
{
   if (this.listViewModels.InvokeRequired)
      {
       getCurrentItemCallback d = new getCurrentItemCallback(GetCurrentItem);
       return this.Invoke(d, new object[] { location });
      }
      else
      {
       return this.listViewModels.Items[location].ToString();
      }
}