Sql to linq query solution

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i try to fetch data from one table first i create sql query and then i try to convert this sql to linq query

What I have tried:

C#

[WebMethod]
public static string GetVol()
{
try
{
TrackDataEntities1 DB = new TrackDataEntities1();
var a = DB.tblVeh;
string data = "[";
foreach (var p in a)
{
var re = (from vehvoila in DB.tblVeh
where vehvoila.MID.Equals("23065") && !(vehvoila.Name == "")
group vehvoila by new { vehvoila.Name } into g
select new
{
g.Key.Name ,
cnt = g.Select(t => t.Name ).Count()
});
}



data = data.Substring(0, data.Length - 1);
data += "]";
return data;
}

catch (Exception exception)
{
throw new Exception();

}

}

actual sql query is

SQL

Select Name, count(*) from tblVeh
WHERE MID = 23065 and Name <> '' Group By Name

data

C#

VName (No column name)
d1     2
s2     1
f3      2

now when i debug `'re'` shows

'System.Data.Objects.ObjectQuery<<>f__AnonymousType1<string,int>>}'
but i want data like this

['d1',2],['s2',1],['f3',20]

i fetch data only from one table

Posted 8-Jun-16 19:48pm

super_user

Updated 8-Jun-16 20:33pm

v2

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Comments

Maciej Los 9-Jun-16 2:13am

If i understand you well, you want to return string in this format: ['d1',2],['s2',1],['f3',20]. Am i right?

super_user 9-Jun-16 2:28am

yes exaclty

1 solution

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Maciej Los · Accepted Answer · 2016-06-08T20:33:00

If you want to return a set of records, try this:

C#

string sMid = "23065";
var re = DB.tblVeh
           .Where(v=>v.MID.Equals(sMid) && v.Name != string.Empty)
           .GroupBy(v=>v.Name)
           .Select(g=> new
               {
                   Vname = g.Key.Name,
                    Count = g.Count()
               }).ToList();

Above code returns:

Vname   Count
d1      2
e3      5
g2      8

To be able to go through the resultset, you have to use foreach(...) loop:

C#

Console.WriteLine("Vname - Count");
foreach(var a in re)
{
    Console.WriteLine("{0} - {1}", a.Vname, a.Count);
}

If you want to return string splited by comma, try this:

C#

string sMid = "23065";
var re1 = String.Join(",", DB.tblVeh
           .Where(v=>v.MID.Equals(sMid) && v.Name != string.Empty)
           .GroupBy(v=>v.Name)
           .Select(g=> new
               {
                   a = String.Format("[{0},{1}]", g.Key.Name, g.Count())
               }));