<PackageReference Include="Newtonsoft.Json.Bson" Version="1.0.1" />

Newtonsoft.Json.Bson.BsonDataWriter

public class BsonDataWriter : JsonWriter
Represents a writer that provides a fast, non-cached, forward-only way of generating BSON data.
namespace Newtonsoft.Json.Bson { public class BsonDataWriter : JsonWriter { public DateTimeKind DateTimeKindHandling { get; set; } public BsonDataWriter(Stream stream); public BsonDataWriter(BinaryWriter writer); public void WriteObjectId(byte[] value); public void WriteRegex(string pattern, string options); } }