Question c# thread exception

[Rafal1991]

  th1 = new Thread(async() =>
            {
                System.Diagnostics.Debug.WriteLine(Thread.CurrentThread.ManagedThreadId);
                ObservableCollection<Image> col = new ObservableCollection<Image>();
                List<string> listt = Directory.GetFiles("E:/anime").ToList();
                List<FileInfo> filee = new List<FileInfo>();



                foreach (string file in listt)
                {
                    filee.Add(new FileInfo(file));
                }
             
               
                    System.Diagnostics.Debug.WriteLine("Task1");
                col = await Copier.CopyFiles(filee, (x) => { });

                this.Dispatcher.Invoke(() =>
                {
                    Dispatcher.Invoke(() =>
                    {
                          list.ItemsSource= col;

                     
                    });
                 

                });
            });




            th1.SetApartmentState(ApartmentState.STA);
            th1.Start();
            th1.Join();

   System.Diagnostics.Debug.WriteLine(Thread.CurrentThread.ManagedThreadId);

            th1 = new Thread(async() =>
            {
                System.Diagnostics.Debug.WriteLine(Thread.CurrentThread.ManagedThreadId);
                ObservableCollection<Image> col = new ObservableCollection<Image>();
                List<string> listt = Directory.GetFiles("E:/anime").ToList();
                List<FileInfo> filee = new List<FileInfo>();



                foreach (string file in listt)
                {
                    filee.Add(new FileInfo(file));
                }
             
               
                    System.Diagnostics.Debug.WriteLine("Task1");
                col = await Copier.CopyFiles(filee, (x) => { });

                this.Dispatcher.Invoke(() =>
                {
                    Dispatcher.Invoke(() =>
                    {
                        list.ItemsSource = new ObservableCollection<Image> { new Image()};
                     

                     
                    });
                 

                });
            });




            th1.SetApartmentState(ApartmentState.STA);
            th1.Start();
            th1.Join();
         
         

        }

 

[Skydiver]

What exception are you getting?

 

[Rafal1991]

if(!CheckAccess())
{
throw new InvalidOperationException(SR.Get(SRID.VerifyAccess));
}
}

 

[Rafal1991]

i search formus but i didnt find solution

 

[Rafal1991]

"The calling thread cannot access this object because it belongs to another thread." it is exception

 

[Skydiver]

What does CheckAccess() do? Is it called in the working version?

Anyway, it looks like you are comparing apples to oranges. In the non-working version, you are using whatever Copier.CopyFiles() returns, while in the working version you are using an ObservableCollection<Image> . It seems like the former has some kind of thread affinity.