How to Convert BitmapImage to Storage File in Windows Phone 8.1 Win RT

BitmapImage to Storage File conversion requires following steps.

1. BitmapImage to byte array conversion.
2. Creation of temporary StorageFile.
3. Writing byte array data on empty storage file.

BitmapImage to byte array conversion

BitmapImage bitmap = ImageBoxPreview.Source as BitmapImage;

RandomAccessStreamReference rasr = RandomAccessStreamReference.CreateFromUri(bitmap.UriSource);

var streamWithContent = await rasr.OpenReadAsync();

byte[] buffer = new byte[streamWithContent.Size];

await streamWithContent.ReadAsync(buffer.AsBuffer(),(uint)streamWithContent.Size, InputStreamOptions.None);

Creation of temporary StorageFile

StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync("temp.jpeg", CreationCollisionOption.ReplaceExisting);

Writing byte array data on empty storage file

using (IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.ReadWrite))

{

      using (IOutputStream outputStream = fileStream.GetOutputStreamAt(0))

      {

               using (DataWriter dataWriter = new DataWriter(outputStream))

               {

                      dataWriter.WriteBytes(buffer);

                      await dataWriter.StoreAsync(); // 

                      dataWriter.DetachStream();

               }

               // write data on the empty file:

               outputStream.FlushAsync();

       }

        fileStream.FlushAsync();

}

Complete code will be:

Convert BitmapImage to Storage File in Windows Phone 8.1 Win RT.