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The ToDataSourceResult() method should support aggregates with DataTables for ASP.NET Core #4798

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Alex-Bubblemaster opened this issue Jan 25, 2019 · 2 comments

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@Alex-Bubblemaster
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commented Jan 25, 2019

Enhancement

Ticket ID: 1384643

Reproduction of the problem

Create a grid using DataTables. Add agggregates to the data source:

           .Aggregates(aggregates =>
           {
               foreach (System.Data.DataColumn column in Model.Columns)
               {
                   if (column.DataType == typeof(int))
                   {
                       aggregates.Add(column.ColumnName, typeof(int)).Sum();
                   }
                   if (column.DataType == typeof(string))
                   {
                       aggregates.Add(column.ColumnName, typeof(int)).Count();
                   }
               }
           })

An error is thrown:

Stack trace

Expected/desired behavior

The aggregates should be calculated correctly

Workaround

  • add a System.Data.DataSetExtensions.dll and use the .AsEnumerable() method

  • specify the fields and object types. While this takes away from the dynamic definition, it is a way to use the grid at present with aggregates

        public IActionResult Read([DataSourceRequest] DataSourceRequest request)
        {
            var res = GetDataTable(500).AsEnumerable().Select(x=> new {                
                Field1 = x.Field<string>("Field1"),
                Field2 = x.Field<int>("Field2")
            });
            return Json(res.ToDataSourceResult(request));
        }

Environment

  • Kendo UI version: 2019.1.115
@VicTachev

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commented Apr 15, 2019

Reported again in ticket 1404416

@marin-bratanov

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commented Jun 28, 2019

Also requested in 1413810. Raising priority

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