ModelState中是空模型有效 [英] ModelState is valid with null model

问题描述

我有一个必需的属性Model对象

I have a Model object with a required attribute

 public class ApiPing
    {
        [Required]
        public DateTime ClientTime { get; set; }

        public DateTime ServerTime { get; set; }
    }

我有检查模式状态的控制器的方法。

I have a Controller method that checks model state.

   public IHttpActionResult Ping(ApiPing model)
    {    
        if (!ModelState.IsValid)
            return BadRequest(ModelState);

        model.ServerTime = DateTime.UtcNow;

        return Ok(model);
    }

如果我提交提交适当的请求（用模型）来操作方法我从ModeState.IsValid（真）的正确值。然而，当我提出无效请求（没有一个模型，因此模型为null）我得到一个错误的ModelState.IsValid（也是如此）。

If I submit a submit a proper request (with a model) to the action method I get an correct value from ModeState.IsValid (true). However, when I submit an invalid request (without a model, so the model is null) I get an erroneous ModelState.IsValid (also true).

我可以简单地检查是否该模型是在我的code空，但气味。这是一个预期的'功能'或的ModelState验证错误？难道我做错了什么？难道我期望太高了？

I could simply check if the model is null in my code, but that smells. Is this an intended 'feature' or a bug in ModelState validation? Am I doing something wrong ? Am I expecting too much ?

推荐答案

我有同样的问题之前，答案已经在一些论坛上可用，甚至在这里SO：<一href=\"http://stackoverflow.com/questions/17923622/modelstate-isvalid-even-when-it-should-not-be\">ModelState.IsValid即使它不应该是什么？

I had the same problem before and the answer is already available in a few forums and even here at SO: ModelState.IsValid even when it should not be?

您还可以添加自定义过滤器来验证（无效）缺少字段和/或空值
<一href=\"http://www.asp.net/web-api/overview/formats-and-model-binding/model-validation-in-aspnet-web-api\">http://www.asp.net/web-api/overview/formats-and-model-binding/model-validation-in-aspnet-web-api

You can also add a custom filter to validate (invalidate) missing fields and/or null values http://www.asp.net/web-api/overview/formats-and-model-binding/model-validation-in-aspnet-web-api

<一个href=\"http://www.strathweb.com/2012/10/clean-up-your-web-api-controllers-with-model-validation-and-null-check-filters/\">http://www.strathweb.com/2012/10/clean-up-your-web-api-controllers-with-model-validation-and-null-check-filters/

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