NancyFX:如何检查查询字符串/表单值是否已正确传递给我的处理程序? [英] NancyFX: How do I check if query-string / form values have been correctly passed to my handler?

问题描述

Nancy通过dynamic变量将我的查询字符串和表单值传递给我的处理程序.下面的示例显示了通过Nancy请求将表单值传递给POST处理程序，例如Request.Form.xxx.

Nancy passes my query-string and form values to my handlers via a dynamic variable. The example below shows form values being passed in to a POST handler via the Nancy request e.g. Request.Form.xxx.

处理程序

Post["/"] = _ =>
    {
        var userId = (string) Request.Form.userid;
        if (userId.IsEmpty()) return HttpStatusCode.UnprocessableEntity;
        return HttpStatusCode.OK;
    };

您可以看到我正在将userid强制转换为字符串，然后使用字符串扩展方法来检查该值是否为null或空字符串(等同于string.IsNullOrEmpty()).

You can see that I am casting the userid to a string and then using a string extension method to check if the value is null or empty string (equivalent to string.IsNullOrEmpty()).

我希望对动态类型使用扩展方法，这样我就可以在执行其他任何操作之前执行健全性检查.我想要这样的代码:

What I would prefer is to to have the extension method on the dynamic type so I could perform my sanity checks before doing anything else. I want code like this:

if(Request.Form.userid.IsEmpty()) return HttpStatusCode.UnprocessableEntity;

但是，您不能具有dynamic类型的扩展方法.同样，您不能通过反射检查属性的存在.欢迎使用DLR.

However, you cannot have extension methods for dynamic types. Also, you cannot check for the presence of a property via reflection. Welcome to the DLR.

问题

执行预检查以确保预期的查询/表单值已传递给我的Nancy处理程序的最简单，最安全的方法是什么?

What is the easiest, safest way to perform pre-checks to ensure that the expected query/form values have been passed to my Nancy handler?

谢谢

推荐答案

Request.Form.userid.HasValue

适用于所有DynamicDictionary成员，例如Form，Query和route参数

Works for all DynamicDictionary members, such as Form, Query and route parameters

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