// Use Service to download stream (returns System.IO.Stream) 
Stream stream = MyService.Download(("1231"));
// ReadStream
StreamReader reader = new StreamReader(stream);
reader.ReadToEnd();

// Write this stream to a file/Hard disk
???

解决方法

Stream stream = MyService.Download(("1231"));
using (Stream s = File.Create(path))
{
    stream.CopyTo(s);
}

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