... public static IQueryable<T> OrderByEx<T>(this IQueryable<T> q, string direction, string fieldName) { try { var customProperty = typeof(T).GetCustomAttributes(false).OfType<ColumnAttribute>().FirstOrDefault(); if (customProperty != null) { fieldName = customProperty.Name; } var param = Expression.Parameter(typeof(T), "p"); var prop = Expression.Property(param, fieldName); var exp = Expression.Lambda(prop, param); string method = direction.ToLower() == "asc" ? "OrderBy" : "OrderByDescending"; Type[] types = new Type[] {q.ElementType, exp.Body.Type}; var mce = Expression.Call(typeof(Queryable), method, types, q.Expression, exp); return q.Provider.CreateQuery<T>(mce); } catch (Exception ex) { _log.ErrorFormat("error form OrderByEx."); _log.Error(ex); throw ; } } ...
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