How Can I Select The Valuues Using Aggregate Functions Like Count(),Max() In Linq?

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C#

using (School_365Entities db = new School_365Entities())
           {
               var Query = (from x in db.tbl_staticfielddetails
                            where x.institutionid == insid
                            select x.id).Count();

               foreach (var item in Query)
               {
                   cnt = Convert.ToInt32(item.ToString());

               }

           }

I got the error

SQL

Error   foreach statement cannot operate on variables of type 'int' because 'int' does not contain a public definition for 'GetEnumerator'

Posted 8-Jul-14 20:25pm

ilaya muthumanickam

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Аslam Iqbal 9-Jul-14 5:27am

var Query is int type variable not a list. Query represents the count of the written LINQ. Remove the .Count() & try again, foreach will work for Query.

4 solutions

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Raul Iloc · Accepted Answer · 2014-07-08T21:01:00

1.Your code above return only one results of type integer (the count result) and you cannot iterate into one it.

2.For examples of LINQ expresions that are using almost all possible aggregate functions see the next MSDN link:
http://code.msdn.microsoft.com/LINQ-Aggregate-Operators-c51b3869[^]

kedar001 · Accepted Answer · 2014-07-08T20:33:00

Solution 1

this might help you...

http://www.c-sharpcorner.com/UploadFile/3d39b4/aggregate-functions-in-linq-to-sql/[^]

Posted 8-Jul-14 20:33pm

kedar001

DamithSL · Accepted Answer · 2014-07-08T20:53:00

Solution 2

you can directly get the count as below

SQL

int count = (from x in db.tbl_staticfielddetails
                            where x.institutionid == insid
                            select x.id).Count();

reason is Count [^] method return type is int

Posted 8-Jul-14 20:53pm

DamithSL

Updated 8-Jul-14 20:54pm

v2

Pravuprasad · Accepted Answer · 2014-07-08T21:32:00

Solution 4

C#

var Query = (from x in db.tbl_staticfielddetails
                           where x.institutionid == insid
                           select x.id).Count();

here your query returns a integer value. So why are you putting this inside a loop?

Posted 8-Jul-14 21:32pm

Pravuprasad