I'm using Entity Framework for the first time, but it seems not working as expected.
I have this code:
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
public static class QueryClass
{
public static void Query()
{
using (var context = new MyDbEntities())
{
DbSet<MyTable> set = context.Tables;
var query = from val in set select value;
}
}
}
On the query line (exactly the "set" variable is underlined in red) I get the error:
Could not find an implementation of the query pattern for source type 'System.Data.Entity.DbSet'.'Select' not found. Missing a reference or an using directive for 'System.Linq'
MyDbEntities is auto-generated by Entity Framework in a Database-First approach, context.Tables is a DbSet, so it should be able to use Linq, which has been added through the using directive. In order to avoid misurderstantings, within this class I find the following:
public virtual DbSet<MyTable> Tables { get; set; }
What am I missing in order to make the select work?
Thank you.
you will need to add reference to System.Data.Linq
System.Data.Linq is LINQ-SQL specific (DataContext, etc)
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Linq;
using System.Linq;
public static class QueryClass
{
public static void Query()
{
using (var context = new MyDbEntities())
{
IQueryable<MyTable> qTable= from t in context.Tables
select t; // can you confirm if your context has Tables or MyTables?
Console.WriteLine("Table Names:");
foreach (var t in qTable)
{
Console.WriteLine(t.Name);//put the relevant property instead of Name
}
}
}
}