如何异步写入图像字节？

Question

I am trying to store a file in local directory using Windows.Storage but I get an error when I try to store a second image

I am using the Windows.Storage

async void ReceiveDecodedData(byte[] data, int width, int height)
{
   StorageFolder storageFolder = KnownFolders.PicturesLibrary;

   string filename = "sample" + ".jpg";

   StorageFile file = await storageFolder.CreateFileAsync(filename, CreationCollisionOption.OpenIfExists);
   await FileIO.WriteBytesAsync(file, data);

}

I want to write the bytes to the image without any error/exceptions.

Exception: "The process cannot access the file because it is being used by another process."

Answer 1

If the method does not return a Task then you can't use it within an async/await pattern. JSteward is correct that you should replace async void with async Task. If you are calling the function somewhere else then create a synchronous version of the method and call the same underlying function.

How and when to use 'async' and 'await'