MongoDB.Bson.Serialization.BsonMemberMap.GetDefaultValue C# (CSharp) Метод

        private static object GetDefaultValue(Type type)
        {
            if (type.IsEnum)
            {
                return Enum.ToObject(type, 0);
            }

            switch (Type.GetTypeCode(type))
            {
                case TypeCode.Empty:
                case TypeCode.DBNull:
                case TypeCode.String:
                    break;
                case TypeCode.Object:
                    if (type.IsValueType)
                    {
                        return Activator.CreateInstance(type);
                    }
                    break;
                case TypeCode.Boolean: return false;
                case TypeCode.Char: return '\0';
                case TypeCode.SByte: return (sbyte)0;
                case TypeCode.Byte: return (byte)0;
                case TypeCode.Int16: return (short)0;
                case TypeCode.UInt16: return (ushort)0;
                case TypeCode.Int32: return 0;
                case TypeCode.UInt32: return 0U;
                case TypeCode.Int64: return 0L;
                case TypeCode.UInt64: return 0UL;
                case TypeCode.Single: return 0F;
                case TypeCode.Double: return 0D;
                case TypeCode.Decimal: return 0M;
                case TypeCode.DateTime: return DateTime.MinValue;
            }
            return null;
        }