Example documentation - best practices to extract column for server side sorting?

Hello, fantastic library, just had a question on best practices in sorting via LINQ based on the IDataTablesRequest request

For example, I know I can extract the given column for which the sort has been applied on the client side by:

var sortColumn = request.Columns.Where(c => c.Sort != null).FirstOrDefault();

From there, I have access to the field name as a string and can check the string to conditionally create a where clause, but is there a better way?

[sintetico82]

Hi! inspired by this stackoverflow answer: http://stackoverflow.com/a/36303246/726868

I create this extension method for IQueryable OrderBy

 public static IQueryable<T> OrderBy<T>(this IQueryable<T> source, IEnumerable<DataTables.AspNet.Core.IColumn> sortModels)
        {
            var expression = source.Expression;
            int count = 0;
            foreach (var item in sortModels)
            {
                var parameter = Expression.Parameter(typeof(T), "x");
                var selector = Expression.PropertyOrField(parameter, item.Field);
                var method = item.Sort.Direction == DataTables.AspNet.Core.SortDirection.Descending ?
                    (count == 0 ? "OrderByDescending" : "ThenByDescending") :
                    (count == 0 ? "OrderBy" : "ThenBy");
                expression = Expression.Call(typeof(Queryable), method,
                    new Type[] { source.ElementType, selector.Type },
                    expression, Expression.Quote(Expression.Lambda(selector, parameter)));
                count++;
            }
            return count > 0 ? source.Provider.CreateQuery<T>(expression) : source;
        }

So you can active your goals like this:

 var orderColums = request.Columns.Where(x => x.Sort != null);
 var dataPage = data.OrderBy(orderColums).Skip(request.Start).Take(request.Length);

bye

[sintetico82]

It’s so funny. I was searching for the same solution now… and i found the answer of myself ahaha We live in the loop!