ModelState.AddModelError - 我如何添加一个错误，不是财产？ [英] ModelState.AddModelError - How can I add an error that isn't for a property?

问题描述

我检查我的数据库中创建（FooViewModel FVM）{...} 来查看是否 fvm.prop1 和 fvm.prop2 已经存在在组合;如果是的话，我想的错误添加到的ModelState，则返回全图。我想：

I am checking my database in Create(FooViewModel fvm){...} to see if the fvm.prop1 and fvm.prop2 already exist in that combination; if so, I want to add an error to the modelstate, then return the whole view. I tried:

public ActionResult Create(FooViewModel fvm){
    if (ThatComboAlreadyExists(fvm)) {
      ModelState.AddModelError("Model", "There is already one like that");
      return View(fvm);
    }
}

...但我没有得到任何的验证摘要，这是错误的显示，我相信他们会出现。我有怀疑，模式是不正确的钥匙，但我一直没能找到任何一拉谷歌。

...but I get no display of errors in the validation summary, which is where I assume they would appear. I have the suspicion that "Model" is not the right key, but I haven't been able to find anything a la Google.

推荐答案

我最终偶然发现的an我一直在寻找的使用的例子 - 的错误分配给一般的模型，而不是它的一个特性，像往常一样打电话：

I eventually stumbled upon an example of the usage I was looking for - to assign an error to the Model in general, rather than one of it's properties, as usual you call:

ModelState.AddModelError(string key, string errorMessage);

但使用空字符串键值：

but use an empty string for the key:

ModelState.AddModelError(string.Empty, "There is something wrong with Foo.");

该错误消息将present自己在＆LT;％：Html.ValidationSummary（）％GT; 如你所期望

这篇关于ModelState.AddModelError - 我如何添加一个错误，不是财产？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！