手动控制器设置ModelState.isValid [英] Manually Set ModelState.isValid from Controller

问题描述

有我手动设置的方式 ModelState.isValid =假从控制器？

Is there a way for me to manually set the ModelState.isValid = False from the controller?

我有一些code这样的

I have some code like this

    Dim _region As Domain.Region = RegionService.GetRegionByNameAndParentID(user.UserRegion, user.ParentRegionID)
    If ModelState.IsValid AndAlso Not _region Is Nothing Then
           ''# ...
    Else
           Return View(user)
    End If

但如果_region什么的话，我没有得到任何验证错误射击。

But if _region is nothing, then I don't get any Validation Errors firing.

我想过实现自定义的验证，但它需要访问数据库两次（审定一次，一次设置的值）。

I thought about implementing a custom validator, but it would require hitting the database twice (once for validation and once to set the value).

推荐答案

您不能设置 ModelState.IsValid 直接，因为它是一个衍生属性，简单地检查模型错误的集合。但是，您可以添加自己的模型误差，例如：

You can't set ModelState.IsValid directly, as it's a derived property that simply checks the models error collection. You can however add your own model errors, e.g:

ModelState.AddModelError("Region", "Region is mandatory");

ModelState.IsValid 然后将返回false。

ModelState.IsValid will then return false.

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