NPoco OrderBy与比较器

Question

以下问题：OrderBy extension method for NPoco.Linq

，因此是这个问题：Natural sort with Dynamic Linq including multiple sorting parameters

带有比较器的OrderBy对NPOCO的外观如何？ 我一直试图匹配自己创建的答案，但没有设法将带有比较器的Expression.Call转换为Invoke。到目前为止，我都没有尝试过这个：

    public static IQueryProvider<T> OrderByField<T, ComparerType>(this IQueryProvider<T> queryProvider, IComparer<ComparerType> comparer, string SortField, bool ascending)
    {
        var param = Expression.Parameter(typeof(T), "p");
        var prop = Expression.Property(param, SortField);
        string methodName = ascending ? "OrderBy" : "OrderByDescending";
        Expression conversion = Expression.Convert(prop, typeof(object));
        LambdaExpression lambda = Expression.Lambda(conversion, param);
        try
        {
            object result = typeof(IQueryProvider<T>).GetMethods().Single(
                    method => method.Name == methodName)
                .Invoke(queryProvider, new object[] { comparer, lambda });

            return (IQueryProvider<T>)result;
        }
        catch(Exception exc)
        {
            return null;
        }

    }