Jquery Datatable服务器端排序和过滤性能

Question

如何提高数据表服务器端处理的排序和过滤性能，

我有100K记录，在我下面的例子中，我只显示了2列，但我有25列

这是我的代码

var allrecords = UserDataAccess.GetAllUsers(Uow).ToList(); // here i call ToList in order to use the count

    var totalRec = allrecords.Count;
    int filteredRecords;

    IList<User> filter;
    IEnumerable<User> sort;

    // filter
    if (!string.IsNullOrEmpty(param.Search.Value))
    {
        filter = UserSearch(param.Search.Value, allrecords).ToList();
        filteredRecords = filter.Count;

    }
    else
    {
        filter = allrecords;
        filteredRecords = totalRec;
    }

    // sort
    if (param.SortOrder != null && param.Order != null)
    {
        sort =
            Sort(filter, param.Order[0], param.SortOrder)
                .Skip(param.Start)
                .Take(param.Length);
    }
    else
    {
        sort = filter.Skip(param.Start)
                .Take(param.Length);
    }


internal static IEnumerable<User> Sort(IEnumerable<User> data, DTOrder order, string columnName)
 {
  var sortColumnIndex = order.Column;
   Func<User, string> orderingFunction = (
        c =>sortColumnIndex == 0 ? c.Name : sortColumnIndex == 1 ?
        c.IC :ortColumnIndex == 2 ? c.Age :"");
        var sortDirection = order.Dir.ToString().ToLower(); // asc or desc
        return sortDirection == "asc" ? data.OrderBy(orderingFunction) : data.OrderByDescending(orderingFunction);

  }

    internal static IEnumerable<User> UserSearch(string search, IEnumerable<User> records)
    {
        return records
            .Where(c => c.Name.ToLower().Contains(search.ToLower())
                            ||
                            c.FuelAssembly.Lot != null && c.IC .ToString().ToLower().Contains(search.ToLower())
                            ); ;

    }

我怎样才能改善这一点？我还有以下代码用于排序，但我的id给出了错误

public static IOrderedQueryable<TSource> Sort<TSource, TKey>(this IQueryable<TSource> source, Func<TSource, TKey> keySelector, bool descending = false)
{
  if (descending) return source.OrderByDescending(keySelector);
  else return source.OrderBy(keySelector);
}

  

无法将类型'System.Linq.IOrderedEnumerable'隐式转换为'System.Linq.IOrderedQueryable'

排序和过滤需要很长时间