使用MemoryStream后C＃WPF UI冻结

Question

I have some trouble with this code:

private Bitmap WriteableBitmapToBitmap(WriteableBitmap wb)
{
     BitmapEncoder encoder = new BmpBitmapEncoder();
     encoder.Frames.Add(BitmapFrame.Create(wb));
     using (MemoryStream ms = new MemoryStream())
     {
         encoder.Save(ms);
         Bitmap b = new Bitmap(ms);
         return b;
      }
}

If I start this code, the WPF UI freezes. I only want to convert a WriteableBitmap to a Bitmap so that I can use it for Emgu picture processing. The WriteableBitmap is created from Depthdata from the Kinect. I am new to programming so there is certainly a better way, but I hope this will work too.

Can anyone help me with that code?

Answer 1

It is a little bit late, but I would like to add some more information.

The problem is that you are using a synchronous call which uses the UI thread, unlike all other synchronous calls, this call takes some time, and therefore, your application is frozen until the call will finish.

You need to use an asynchronous call, so that your UI thread will be free, so the UI will not be frozen.

There are many ways to make an asynchronous calls, such as opening a new task, thread, or my preferable way, is to use the async await, which is very great - you can write a synchronous code, and to add async and await in the right places, and woops - it is an asynchronous code!

To read more about async await click here .