将ModelState传递给RedirectToAction到ViewModel中 [英] Passing ModelState to RedirectToAction into a ViewModel

问题描述

如何传回使用 DbEntityValidationException

            try
            {
                db.SaveChanges();
            }
            catch (DbEntityValidationException dbEx)
            {
                foreach (var validationErrors in dbEx.EntityValidationErrors)
                {
                    foreach (var validationError in validationErrors.ValidationErrors)
                    {
                        this.ModelState.AddModelError(validationError.PropertyName, 
                        validationError.ErrorMessage);
                    }
                }
                return RedirectToAction("AccessDetail", "Home", new { IDValue = access.ID });
            }

看来，当我这样做时 RedirectToAction 我的 ModelState 刷新，我无法查看发现的错误。

It appears that when I do this RedirectToAction my ModelState refreshes and I can not view the errors it found.

AccessDetail填充了一个视图模型，其中包含许多不同的数据源。因此，仅将访问权限传递给视图是行不通的。

The AccessDetail populates a view model that has many different sources of data in it. So passing just the access to the View does not work.

我正在查看此问题，但由于我的视图中装有ViewModel，因此它不符合我的需求

I was looking at this question but it didn't fit my needs as my view is populated with a ViewModel

推荐答案

RedirectToAction 辅助方法对 302 响应发出客户端，使客户端可以向新的url发出新的 GET 请求。

RedirectToAction helper method issues a 302 response to the client which makes the clients to issue a new GET request to the new url.

如果您想在这两个请求之间保留一些数据，使用 TempData 。

If you want to persist some data between these 2 requests, Use TempData.

TempData["Errors"] = yourListOfErrors;
return RedirectToAction("AccessDetail", "Home", new { IDValue = access.ID });

在您的 GET 操作中，阅读

但是如果您不想执行RedirecToAction，则可以简单地将viewmodel返回到视图，并且您具有ValidationSummary帮助器方法。 ，它将显示验证错误消息。

But If you do not want to do the RedirecToAction, You may simply return the viewmodel back to the view and if you have the ValidationSummary helper method, it will show the validation error messages.

简单使用

return View(model);

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