System.Linq.Dynamic.ExpressionParser.GenerateNullableMethodCall C# (CSharp) Method

		private Maybe<Expression> GenerateNullableMethodCall(Type type, Expression instance, int errorPos, string id, TokenId nextToken)
		{
			if (IsNullableType(type))
			{
				var expression = TryParseMemberAccess(type.GetGenericArguments()[0], Expression.Property(instance, "Value"), nextToken, errorPos, id);
				return expression.Select(e => new
				{
					expression = e,
					protectedExpression = !IsNullableType(e.Type) && e.Type.IsValueType
						? Expression.Convert(e, typeof(Nullable<>).MakeGenericType(e.Type))
						: e
				}).Select(notNull =>
				{
					var condition = (Expression) Expression.Condition(Expression.Equal(instance, Expression.Constant(null, type)),
						Expression.Constant(null, notNull.protectedExpression.Type), notNull.protectedExpression);

					// attach raw expression to condition to get it name in GetConditionalName()
					ExtensionsProvider.SetValue(condition, notNull.expression);
					return condition;
				}
					).ToMaybe();
			}
			return Maybe.Nothing;
		}