Stream.Write()和Stream.Read()， Stream.Flush的作用，待学习

1.参考地址：

https://docs.microsoft.com/en-us/dotnet/api/system.io.stream.write?view=net-6.0

Stream.Write(bytes, 0, bytes.Length) 是把bytes写入到Stream流

Stream.Read(bytes, 0 , bytes.Length) 是把Stream流写入到bytes