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

        private Func<object, object> GetGetter()
        {
            var propertyInfo = _memberInfo as PropertyInfo;
            if (propertyInfo != null)
            {
                var getMethodInfo = propertyInfo.GetGetMethod(true);
                if (getMethodInfo == null)
                {
                    var message = string.Format(
                        "The property '{0} {1}' of class '{2}' has no 'get' accessor.",
                        propertyInfo.PropertyType.FullName, propertyInfo.Name, propertyInfo.DeclaringType.FullName);
                    throw new BsonSerializationException(message);
                }
            }

            // lambdaExpression = (obj) => (object) ((TClass) obj).Member
            var objParameter = Expression.Parameter(typeof(object), "obj");
            var lambdaExpression = Expression.Lambda<Func<object, object>>(
                Expression.Convert(
                    Expression.MakeMemberAccess(
                        Expression.Convert(objParameter, _memberInfo.DeclaringType),
                        _memberInfo
                    ),
                    typeof(object)
                ),
                objParameter
            );

            return lambdaExpression.Compile();
        }