<PackageReference Include="System.Text.Encoding.CodePages" Version="10.0.7" />

System.Text.DBCSCodePageEncoding

namespace System.Text { internal class DBCSCodePageEncoding : BaseCodePageEncoding { protected unsafe char* mapBytesToUnicode; protected unsafe ushort* mapUnicodeToBytes; protected char charUnknown; public DBCSCodePageEncoding(int codePage); protected virtual bool CleanUpBytes(ref int bytes); protected unsafe virtual void CleanUpEndBytes(char* chars); } }