ASP.NET calling stored proc with LINQ and passing in DataTable - asp.net

Question

What am I doing wrong?
Trying to pass in my DataTable to a stored proc using LINQ. Below is my code.
var sqlCommand = new System.Data.SqlClient.SqlCommand {
CommandType = System.Data.CommandType.StoredProcedure,
CommandText = "UserIdList"
};
var dataTable = new System.Data.DataTable("IdList");
dataTable.Columns.Add("AttributeIds", typeof(Int32));
dataTable.Rows.Add(26);
dataTable.Rows.Add(40);
dataTable.Rows.Add(41);
dataTable.Rows.Add(45);
dataTable.Rows.Add(78);
dataTable.Rows.Add(33);
dataTable.Rows.Add(36);
//The parameter for the SP must be of SqlDbType.Structured
var parameter = new System.Data.SqlClient.SqlParameter {
ParameterName = "#AttributeIds",
SqlDbType = System.Data.SqlDbType.Structured,
TypeName = "ecs.IDList",
Value = dataTable,
};
sqlCommand.Parameters.Add(parameter);
var user = myDC.DC.ExecuteQuery("exec ecs.udpUserAttributeDetails {0}, {1}", sqlCommand, userId).SingleOrDefault();

Answer 1

This seems to be the problem
var user = myDC.DC.ExecuteQuery("exec ecs.udpUserAttributeDetails {0}, {1}", sqlCommand, userId).SingleOrDefault();
In your code, you are passing a sqlCommand object as the first parameters and the userId as the 2nd parameter.
A data context ExecuteQuery method has 2 overloads
ExecuteQuery<TResult>(String, Object[])
ExecuteQuery(Type, String, Object[])
You seem to be using Overload 1 - i.e. ExecuteQuery<TResult>(String, Object[]) but in that case you need to specify the type of the returned object
eg :-
var customers = db.ExecuteQuery<Customer>(#"SELECT CustomerID, CompanyName, ContactName FROM dbo.Customers WHERE City = {0}", "London");
NOTE: db.ExecuteQuery<Customer> in the above example is what I am referring to.
I think this might be the cause of the error as the compiler is mapping your request to overload 2 instead which doesnt return any values but takes in 3 parameters resulting in your A query parameter cannot be of type 'System.Data.SqlClient.SqlCommand error.