Don't re-evaluate to get total count

Author: mcintyre321

Mvc.JQuery.Datatables/DataTablesFilter.cs

@@ -7,7 +7,7 @@ namespace Mvc.JQuery.Datatables
 {
     public class DataTablesFilter
     {
-        public IQueryable FilterPagingSortingSearch(DataTablesParam dtParameters, IQueryable data, out int totalRecordsDisplay, Tuple<string, string, Type>[] columns)
+        public IQueryable FilterPagingSortingSearch(DataTablesParam dtParameters, IQueryable data, Tuple<string, string, Type>[] columns)
         {
             if (!String.IsNullOrEmpty(dtParameters.sSearch))
             {
@@ -47,8 +47,6 @@ public IQueryable FilterPagingSortingSearch(DataTablesParam dtParameters, IQuery
                 sortString += columnName + " " + sortDir;
             }
 
-            totalRecordsDisplay = data.Count();
-
             data = data.OrderBy(sortString);
             data = data.Skip(dtParameters.iDisplayStart);
             if (dtParameters.iDisplayLength > -1)

Mvc.JQuery.Datatables/DataTablesResult.cs

@@ -85,16 +85,13 @@ public static void RegisterFilter<TVal>(GuardedValueTransformer<TVal> filter)
         private DataTablesData GetResults(IQueryable<T> data, DataTablesParam param, Tuple<string, string, Type>[] searchColumns)
         {
 
-            int totalRecords = data.Count();
-
-
-            int totalRecordsDisplay;
+            int totalRecords = data.Count(); //annoying this, as it causes an extra evaluation..
 
             var filters = new DataTablesFilter();
 
 
             var dataArray = data.Select(_transform).AsQueryable();
-            dataArray = filters.FilterPagingSortingSearch(param, dataArray, out totalRecordsDisplay, searchColumns).Cast<TRes>();
+            dataArray = filters.FilterPagingSortingSearch(param, dataArray, searchColumns).Cast<TRes>();
 
             var type = typeof(TRes);
             var properties = type.GetProperties();
@@ -104,12 +101,13 @@ private DataTablesData GetResults(IQueryable<T> data, DataTablesParam param, Tup
                                let values = pairs.Select(p => GetTransformedValue(p.PropertyType, p.Value))
                                select values;
 
+            IEnumerable<object>[] aaData = toArrayQuery.ToArray();
             var result = new DataTablesData
             {
                 iTotalRecords = totalRecords,
-                iTotalDisplayRecords = totalRecordsDisplay,
+                iTotalDisplayRecords = aaData.Length,
                 sEcho = param.sEcho,
-                aaData = toArrayQuery.ToArray()
+                aaData = aaData
             };
 
             return result;