error The type arguments for method 'System.Linq.Enumerable.

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Hi Everyone,

I have written the code as follows:In group by clause i want to group by CellId.

SQL

if (zteBbhRecords.Count > 0)
                           {
                               zteBbhRecords.Cast<IZteBbh>().Select(zteBbh => (zteBbh.CombinedMaster as ICombinedMaster).CellId.ToString()).GroupBy((zteBbhEntity.CombinedMaster as ICombinedMaster).CellId).Where(items => items.Count() > 1).Select(item => item.Key).Distinct().ToArray();
                           }

I am getting the error as follows:

Error	19	The type arguments for method 'System.Linq.Enumerable.GroupBy<TSource,TKey>(System.Collections.Generic.IEnumerable<TSource>, System.Func<TSource,TKey>)' cannot be inferred from the usage. Try specifying the type arguments explicitly.	F:\Quantum India\New Projects\Kaizen\Code\Kaizen.Application\Kaizen.Application.2G\Kaizen.Application.2G.DataManagers\ZteBbhDataManager.cs	218	33	Kaizen.Application.Kaizen2G.DataManagers

Please kindly assist .
Thanks
Harshal

Posted 16-May-14 2:15am

R Harshal

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[no name] 16-May-14 10:07am

Anybody can guide me .Please

Thanks
Harshal

karthik Udhayakumar 17-May-14 1:37am

which line throws this error ..can you insert a breakpoint and let me know?

Abhishek Bose 17-May-14 14:20pm

Hi Karthy,<br>
<br>
I guess it is pretty clear that the group by operator is causing the exception.

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Abhishek Bose · Accepted Answer · 2014-05-17T08:19:00

Hi R Harshal,

The Group By operator cannot be used as the way you are using it. Simply putting the cast doesnot work (This is what you are doing here -

GroupBy((zteBbhEntity.CombinedMaster as ICombinedMaster).CellId)

Rather it should be something like

GroupBy(cells =>(zteBbhEntity.CombinedMaster as ICombinedMaster).CellId)

. Group By has 8 Overloads and for deep insight you can refer the following link - http://msmvps.com/blogs/jon_skeet/archive/2011/01/01/reimplementing-linq-to-objects-part-21-groupby.aspx[^]