public Alumno Obtener(int id)
{
var alumnos = new Alumno();
try
{
using (var ctx = new TestContex())
{
alumnos = ctx.Alumno.Where(x => x.Id == id).SingleOrDefault();
}
}
catch (Exception)
{
throw;
}
return(alumnos);
}
public void Eliminar(int id)
{
try
{
using (var ctx = new TestContex())
{
ctx.Entry(new Alumno {
Id = id
}).State = EntityState.Deleted;
ctx.SaveChanges();
}
}
catch (Exception)
{
throw;
}
}
public List <Alumno> Listar()
{
var alumnos = new List <Alumno>();
try
{
using (var ctx = new TestContex())
{
alumnos = ctx.Alumno.ToList();
}
}
catch (Exception)
{
throw;
}
return(alumnos);
}
public void Guardar(Alumno alumno)
{
try
{
using (var ctx = new TestContex())
{
//Regitro que ya existe
if (alumno.Id > 0)
{
ctx.Entry(alumno).State = EntityState.Modified;
}
else
{
ctx.Entry(alumno).State = EntityState.Added;
}
ctx.SaveChanges();
}
}
catch (Exception)
{
throw;
}
}