Problem converting dataset to list in c# using linq

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C#

public List<createUserModel> userAvailabilityCheck(createUserModel obj)
        {
            SqlConnection dbConnection = new SqlConnection(conntection);
            SqlCommand cmd = new SqlCommand("select_User", dbConnection);
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = cmd;
            DataSet ds = new DataSet();
            da.Fill(ds);

            var query = (from n in ds.Tables["User"].AsEnumerable()
                         where n.Field<string>("userName") == obj.UserName
                         select n);
            List<createUserModel> checkList = query.ToList();
            return checkList;
        }

Getting Error on

C#

List<createUserModel> checkList = query.ToList();

this line.

C#

cannot convert source type system.collections.generic.list<System.Data.DataRow> to target type system.collections.generic.list<createUserModel>

Please Help.

Posted 1-Feb-15 20:22pm

Adil Liaqat

Updated 2-Mar-22 1:38am

v3

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Comments

Kenneth Haugland 2-Feb-15 2:53am

You just got the row in your query, you need to get the underlying class of the row i.a. the createUserModel.

Sinisa Hajnal 2-Feb-15 3:05am

The error tells you what is wrong. You're trying to convert DataRow to createUserModel i.e. in your query there are datarows, not createUserModels.

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OriginalGriff · Answer 1 · 2015-02-01T21:50:00

Linq doesn't know what types it should use - so when you iterate a DataTable and select items it returns DataRow items which don't have any casting operations to your own classes! Instead, create a createUserModel constructor that accepts a DataRow and select that instead:

C#

var query = (from n in ds.Tables["User"].AsEnumerable()
             where n.Field<string>("userName") == obj.UserName
             select new createUserModel(n));
List<createUserModel> checkList = query.ToList();