Select with entity does not work

I have this method that makes me a select but it does not return anything to me.

[WebMethod]
[ScriptMethod(UseHttpGet = true)]
public JsonResult GetContratos()
{
     List<object> resultado = new List<object>();
     var contratos = db.Contratos.Where(c => c.Tipo != "N").Select(c => c.Id);

     foreach (string contrato in contratos)
     {
          resultado.Add(new { id = contrato, value = contrato });
     }
     return Json(resultado, JsonRequestBehavior.AllowGet);
}

I have tried to put the .ToList () in the end and nothing

The SQL that is returned to me in the variable var contratos , when I execute it in sql server it works perfectly, it gives me back, but in C # it does not bring me anything.

{SELECT 
    1 AS [C1], 
    [Extent1].[Id] AS [Id], 
    [Extent1].[DtCriacao] AS [DtCriacao], 
    [Extent1].[DtInicioValidade] AS [DtInicioValSELECT 
    [Extent1].[Id] AS [Id]
    FROM [dbo].[Contrato] AS [Extent1]
    WHERE  NOT ((N'N' = [Extent1].[Tipo]) AND ([Extent1].[Tipo] IS NOT NULL))

The image of the code running on the bank is