SeekableStreamCopyToAsync - метод

Список перегрузок

CopyToAsync(Stream)Asynchronously reads the bytes from the current stream and writes them to another stream.
CopyToAsync(Stream, Int32)Asynchronously reads the bytes from the current stream and writes them to another stream, using a specified buffer size.
CopyToAsync(Stream, CancellationToken)Asynchronously reads the bytes from the current stream and writes them to another stream, using a specified cancellation token.
CopyToAsync(Stream, Int32, CancellationToken)Asynchronously reads the bytes from the current stream and writes them to another stream, using a specified buffer size and cancellation token.

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