ASP.NET MVC [HttpPost] 操作接受单个对象，将验证错误吐回 ViewPage<CustomViewModel> [英] ASP.NET MVC [HttpPost] action accepts single object, spits back validation errors to ViewPage&lt;CustomViewModel&gt;

问题描述

我正在试验强类型视图模型、完整视图和部分视图的不同组合，同时使用 RenderPartial() 和 RenderAction().不过，我要问的表单发布场景是来自主"视图的场景——不是局部的.这个主视图的控制器构造了视图模型，该模型为部分视图提供了它们的模型.

I'm experimenting with different combinations of strongly typed view models, full views and partial views, using both RenderPartial() and RenderAction(). The form-post scenario I'm asking about, though, is one that comes from the "main" view--one that isn't a partial. This main view's controller constructs the view model that provides the partial views with their models.

[HttpPost] 动作也在主控制器中，并且接受单个对象:

The [HttpPost] action is also in the main controller, and accepts a single object:

    [HttpPost]
    public ActionResult Edit([Bind(Prefix="Book")]Book book)

当 ModelState 有效并且更新成功时，我使用 RedirectToAction()，这一切都很好.

When the ModelState is valid, and the update is successful, I use a RedirectToAction(), which is all fine.

然而，当 ModelState 出现错误时，我会尝试:

When there are errors in the ModelState, however, I attempt to:

Return View(book);

-当然，视图期望包含各种其他对象和选择列表等的主"视图模型对象，这就是问题所在.

-and the view, of course, is expecting the "main" view model object that contains all kinds of other objects and Select Lists, etc., which is the problem.

在这种情况下，人们是否将整个视图模型对象用作 [HttpPost] 操作的参数，以便在出现错误时将其传回?我知道这不可能是正确的，而是认为有一个我不知道的更简单的解决方案.

In this case, do people use the whole view model object as a parameter to their [HttpPost] action, so that they can pass it back if there is an error? I know this can't be right, but rather think there is an easier solution that I am unaware of.

推荐答案

一种值得考虑的常见模式是 PRG 或 Post-Redirect-Get.

One common pattern worth considering is PRG or Post-Redirect-Get.

如果验证失败，重定向到原始的 Get 操作，如果验证通过，则获取序列中的下一个页面.

If validation fails, redirect to the original Get action, if validation passes, GET your next page in the sequence.

1. /products/create"的 HTTP GET，呈现创建"视图
2. HTTP POST 到/products/submit"
3. 验证失败，重定向到/products/create"，呈现Create"视图
4. HTTP POST 到/products/submit"
5. 项目已创建，重定向到/products/confirm"，呈现Confirm"视图

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