Error: The calling thread cannot access this object because a different thread owns it

Question

I get this error. Here is the code: ``` Image image; BitmapImage BmpImg; MemoryStream ms; public void Convert() { ms = new MemoryStream(); image.Save(ms, ImageFormat.Jpeg); BmpImg = new BitmapImage(); BmpImg.BeginInit(); BmpImg.StreamSource = new MemoryStream(ms.ToArray()); BmpImg.EndInit(); } private void Btn_Click(object sender, RoutedEventArgs e) { Dispatcher.Invoke(new Action(() => { Image.Source = BmpImg; })); } ``` How to convert a System.Drawing.Image to BitmapImage and display the same on wpf?

Accepted Answer

`BmpImg` is created on background thread. You cannot bind to `Image Source DP` object which is created on thread other than UI thread.

Since you are using `Dispatcher`, i assume you now how to delegate stuff on UI thread.

So all you need to do is put the creation of `BmpImg` on UI thread as well via Dispatcher.

You can get UI dispatcher like this as well - `App.Current.Dispatcher`.

OR

As @Clemens suggested in comments, if you call `Freeze()` on BitmapImage instance, you can access it across threads.

```
BmpImg.Freeze()
```

Error: The calling thread cannot access this object because a different thread owns it

Solution

Problem