c# - 使用自动映射器更新 Linq？

Question

[HttpPost]
public ActionResult _EditCustomer(CustomerViewModel CustomerViewModel)
{
    if (ModelState.IsValid)
    {
        try
        {
            Customers customer = entity.Customers.FirstOrDefault(x => x.sno == CustomerViewModel.sno);
            customer = AutoMapper.Mapper.Map<CustomerViewModel, Customers>(CustomerViewModel);
            entity.SaveChanges();

            return Content("<div class=\"success\">Müşteri düzenleme işlemi başarılı.</div>", "text/html");
        }
        catch (Exception e)
        {
            ModelState.AddModelError("", "Müşteri güncelleme hatası.");
        }
    }

    //Updating customer is failed!
    CustomerViewModel.Cities = entity.Cities;
    CustomerViewModel.PowerSuppliers = entity.PowerSuppliers;
    CustomerViewModel.Sectors = entity.Sectors;

    return PartialView(CustomerViewModel);
}

我调试了代码，然后在运行时客户正在更新（自动映射器正在工作，我可以看到更改），但entity.SaveChanges();没有工作。

使用自动映射器时，还有其他方法可以更新记录吗？

提前致谢。

Answer 1

您的代码创建了新的客户实体，该实体未附加到上下文：

var newCustomer = Mapper.Map<CustomerViewModel, Customers>(CustomerViewModel);

要更新现有实体，请使用以下Map自动映射器方法：

Mapper.Map(CustomerViewModel, customer);