Multiple Sort Expression

public static IQueryable<T> DataTablesSort<T>(this IQueryable<T> query, IEnumerable<(string column, string direction)> sortExpressions)
        {
            ParameterExpression param = Expression.Parameter(typeof(T));
            for (int i = 0; i < sortExpressions.Count(); i++)
            {
                var index = i;
                MemberExpression prop = Expression.PropertyOrField(param, sortExpressions.ElementAt(index).column);
                LambdaExpression sort = Expression.Lambda(prop, param);

                var functionName = index == 0 ? "OrderBy" : "ThenBy";
                functionName = sortExpressions.ElementAt(index).direction == "desc" ? functionName + "Descending" : functionName;

                MethodCallExpression resultExp = Expression.Call(typeof(Queryable), functionName, new Type[] { typeof(T), prop.Type }, query.Expression, Expression.Quote(sort));

                query = query.Provider.CreateQuery<T>(resultExp);
            }

            return query;
        }