Dont throw the exception in the code #530

    catch (Exception err)
    {
        switch (err.HResult)
        {
            case unchecked((int)0x88982F81): //WINCODEC_ERR_UNSUPPORTEDOPERATION
                                             // If the encoder does not support writing a thumbnail, then try again
                                             // but disable thumbnail generation.
                encoder.IsThumbnailGenerated = false;
                break;
            default:
                throw err;
        }
    }

            try
            {
                await encoder.FlushAsync();
            }
            catch (Exception exception)
            {
                const int WINCODEC_ERR_UNSUPPORTEDOPERATION = unchecked((int) 0x88982F81);

                switch (exception.HResult)
                {
                    case WINCODEC_ERR_UNSUPPORTEDOPERATION:
                        // If the encoder does not support writing a thumbnail, then try again
                        // but disable thumbnail generation.
                        encoder.IsThumbnailGenerated = false;
                        break;
                    default:
                        throw;
                }
            }