public async Task <Stream> OpenFileAsync(string path, FileMode mode, FileAccess access)
{
StorageFile file;
switch (mode)
{
case FileMode.CreateNew:
file = await _folder.CreateFileAsync(path, CreationCollisionOption.FailIfExists).AsTask().ConfigureAwait(false);
break;
case FileMode.Create:
case FileMode.Truncate: // TODO See if ReplaceExisting already truncates
file = await _folder.CreateFileAsync(path, CreationCollisionOption.ReplaceExisting).AsTask().ConfigureAwait(false);
break;
case FileMode.OpenOrCreate:
case FileMode.Append:
file = await _folder.CreateFileAsync(path, CreationCollisionOption.OpenIfExists).AsTask().ConfigureAwait(false);
break;
case FileMode.Open:
file = await _folder.GetFileAsync(path);
break;
default:
throw new ArgumentException("mode was an invalid FileMode", "mode");
}
switch (access)
{
case FileAccess.Read:
return(await file.OpenStreamForReadAsync().ConfigureAwait(false));
case FileAccess.Write:
Stream stream = await file.OpenStreamForWriteAsync().ConfigureAwait(false);
if (mode == FileMode.Append)
{
stream.Position = stream.Length;
}
return(stream);
case FileAccess.ReadWrite:
IRandomAccessStream randStream = await file.OpenAsync(FileAccessMode.ReadWrite).AsTask().ConfigureAwait(false);
return(randStream.AsStream());
default:
throw new ArgumentException("access was an invalid FileAccess", "access");
}
}
public Task <Stream> OpenFileAsync(string path, FileMode mode, FileAccess access, FileShare share)
{
return(OpenFileAsync(path, mode, access));
}