How to do return array or list<string> Entity Framework ?

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string

JSON

stored-procedure

, +

Hello guys, I have a function with store procedure entity framework, i want to return as JSON string .

C#

public static string GetGroupModFunc(string group_mod_id)
       {

           var idParam = new SqlParameter
           {
               ParameterName = "GID",
               Value = group_mod_id
           };
           var obj= db.Database.SqlQuery<string>("EXEC GET_GROUP_PERMIT @GID", idParam).FirstOrDefault();
           string json = "";
           return json = JsonConvert.SerializeObject(obj);
       }

Posted 17-May-15 16:04pm

headshot9x

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3 solutions

Solution 1

you have .FirstOrDefault(); at the end of your c# statement and it will give only single item or null value as result. if you need array or list, use ToList or ToArray methods

C#

var obj= db.Database.SqlQuery<string>("EXEC GET_GROUP_PERMIT @GID", idParam).ToList();
return JsonConvert.SerializeObject(obj);

Posted 17-May-15 17:05pm

DamithSL

Updated 17-May-15 17:11pm

v2

Comments

headshot9x 17-May-15 23:52pm

Well, when debug at var obj = db.Database.SqlQuery<string>("EXEC GET_GROUP_PERMIT @GID", idParam).ToList();
return JsonConvert.SerializeObject(obj); . It's show error "The data reader has more than one field. Multiple fields are not valid for EDM primitive or enumeration types".

Solution 2

change the code like this

List<columns> data = objectContext.ExecuteStoreQuery<columns>("EXEC GET_GROUP_PERMIT @GID", idParam).AsQueryable().ToList();</columns></columns>

Posted 17-May-15 21:09pm

Santhosh Babu Mahimairaj

Updated 17-May-15 21:10pm

v2

Comments

headshot9x 18-May-15 3:30am

Hi Santhosh Babu Mahimairaj. It's not work , I have see ref http://stackoverflow.com/questions/23910390/the-data-reader-has-more-than-one-field-multiple-fields-are-not-valid-for-edm-p ago, but it's not still work.

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headshot9x · Accepted Answer · 2015-05-19T20:55:00

Solution 3

I found solution for this issue : - Get data of store to DataTable , then conver data from DataTable to JSON. It's work fine.

Posted 19-May-15 20:55pm

headshot9x