ln.bson/ln.bson/BsonValue.cs

using System;
using System.Dynamic;
using System.IO;

namespace ln.bson
{
    public abstract class BsonValue : DynamicObject
    {
        public BsonType BsonType { get; }

        protected BsonValue(BsonType bsonType)
        {
            BsonType = bsonType;
        }
        
        public abstract object ToNative();
        public abstract Byte[] GetBytes();

        public virtual T As<T>() => throw new NotImplementedException();

        public virtual void WriteTo(Stream stream) => stream.Write(GetBytes());

        public virtual int WriteTo(byte[] buffer, int offset)
        {
            byte[] vBytes = GetBytes();
            Array.Copy(vBytes, 0, buffer, offset, vBytes.Length);
            return vBytes.Length;
        }

        public override bool Equals(object? obj) => (obj is BsonValue bsonValue) && object.Equals(this.ToNative(), bsonValue.ToNative());


        public static implicit operator BsonValue(bool b) => b ? BsonBoolean.True : BsonBoolean.False;
        public static implicit operator BsonValue(String s) => new BsonString(s);
        public static implicit operator BsonValue(double d) => new BsonDouble(d);
        public static implicit operator BsonValue(DateTime dt) => new BsonDateTime(dt);
        public static implicit operator BsonValue(int i) => new BsonInt32(i);
        public static implicit operator BsonValue(long l) => new BsonInt64(l);
        public static implicit operator BsonValue(byte[] b) => new BsonBinary(BsonBinarySubType.Generic, b);
        public static implicit operator BsonValue(Guid guid) => new BsonGuid(guid);

        public static implicit operator string(BsonValue bsonString) => ((BsonString)bsonString).Value;
    }
}