public T Single(Expression <Func <T, bool> > predicate)
{
using (VirtualStoreContext context = new VirtualStoreContext())
{
return(context.Set <T>().FirstOrDefault(predicate));
}
}
public List <T> Filter(Expression <Func <T, bool> > predicate)
{
using (VirtualStoreContext context = new VirtualStoreContext())
{
return((List <T>)context.Set <T>().Where(predicate).ToList());
}
}
public List <T> GetAll()
{
using (VirtualStoreContext context = new VirtualStoreContext())
{
return((List <T>)context.Set <T>().ToList());
}
}
public virtual void Create(T entity, List <Expression <Func <T, object> > > unchangeProp)
{
// se obtiene la lista de propiedades que deben marcarse con el estado Unchanged
List <string> unchangelist = unchangeProp.Select(x => ((MemberExpression)x.Body).Member.Name).ToList();
using (VirtualStoreContext context = new VirtualStoreContext())
{
context.Set <T>().Add(entity);
if (unchangeProp != null)
{
// se toma la instancia del objeto que esta asignada a la propiedad
// y se asigna el estodo Unchanged
foreach (string property in unchangelist)
{
PropertyInfo propertyInfo = typeof(T).GetProperty(property);
var value = propertyInfo.GetValue(entity, null);
context.Entry(value).State = EntityState.Unchanged;
}
}
context.SaveChanges();
}
}
public Product GetWithCategory(int productID)
{
using (VirtualStoreContext context = new VirtualStoreContext())
{
return(context.Set <Product>().Include("Category").FirstOrDefault(x => x.ProductID == productID));
}
}
public void RemoveEmployees(Territory territory, List <Employee> employees)
{
//validamos que haya algo que remover
if (employees == null || employees.Count == 0)
{
return;
}
using (VirtualStoreContext context = new VirtualStoreContext())
{
//recuperamos el terrotorio y sus empleados
//esto es necesario porque el objeto donde se debe remover tiene que estar dentro del contexto de EF
Territory territorySel = context.Set <Territory>().Include("Employees").FirstOrDefault(x => x.TerritoryId == territory.TerritoryId);
if (territory.Employees == null || territory.Employees.Count == 0)
{
return;
}
employees.ForEach(x =>
{
//localizamos al empleado dentro de la coleccion que se recupero anteriormente
Employee employeeRemove = territorySel.Employees.First(e => e.EmployeeId == x.EmployeeId);
//se remueve de la coleccion haciendo uso de la instancia
territorySel.Employees.Remove(employeeRemove);
});
context.SaveChanges();
}
}
//El método GetById() podría haberse omitido ya que el mismo dato podría haberse recuperado
//mediante la el método Single() que define el repositorio base, utilizando
//Category category = new CategoryRepository().Simple(x => x.CategoryID == categoryId);
public Category GetById(int categoryID)
{
using (VirtualStoreContext context = new VirtualStoreContext())
{
return(context.Set <Category>().FirstOrDefault(x => x.CategoryId == categoryID));
}
}
public void Create(T entity)
{
using (VirtualStoreContext context = new VirtualStoreContext())
{
context.Set <T>().Add(entity);
context.SaveChanges();
}
}
public void Delete(Expression <Func <T, bool> > predicate)
{
using (VirtualStoreContext context = new VirtualStoreContext())
{
var entities = context.Set <T>().Where(predicate).ToList();
entities.ForEach(x => context.Entry(x).State = EntityState.Deleted);
context.SaveChanges();
}
}
public List <T> Filter(Expression <Func <T, bool> > predicate, List <Expression <Func <T, object> > > includes)
{
List <string> includelist = new List <string>();
foreach (var item in includes)
{
MemberExpression body = item.Body as MemberExpression;
if (body == null)
{
throw new ArgumentException("The body must be a member expression");
}
includelist.Add(body.Member.Name);
}
using (VirtualStoreContext context = new VirtualStoreContext())
{
DbQuery <T> query = context.Set <T>();
includelist.ForEach(x => query = query.Include(x));
return((List <T>)query.Where(predicate).ToList());
}
}
