<PackageReference Include="NETStandard.Library" Version="2.0.3" />

System.IO.StreamWriter

public class StreamWriter : TextWriter
namespace System.IO { public class StreamWriter : TextWriter { public new static readonly StreamWriter Null; public virtual bool AutoFlush { get; set; } public virtual Stream BaseStream { get; } public StreamWriter(Stream stream); public StreamWriter(Stream stream, Encoding encoding); public StreamWriter(Stream stream, Encoding encoding, int bufferSize); public StreamWriter(Stream stream, Encoding encoding, int bufferSize, bool leaveOpen); public StreamWriter(string path); public StreamWriter(string path, bool append); public StreamWriter(string path, bool append, Encoding encoding); public StreamWriter(string path, bool append, Encoding encoding, int bufferSize); } }