ASP.NET查询字符串没有等号 [英] ASP.NET QueryString without equals sign

问题描述

当我有一个像网址：

http://www.mysite.com/?MyTest=

MyTest的显示为在请求对象的查询字符串的关键。

MyTest shows up as a key in the querystring of the request object.

如果我删除=符号，如：

If I remove the = sign like:

http://www.mysite.com/?MyTest

它不再查询字符串键显示（或AllKeys如果preFER）。

It no longer shows up in the querystring keys (or AllKeys if you prefer).

如何判断这个键是否存​​在？

How can I determine whether this key exists or not?

推荐答案

这是很奇怪的行为，没有等号（=）的请求返回的查询字符串对象的1 MyTest的值和空的关键计数。结果
你可以测试查询字符串，看它是否包含您所期望的值：

This is quite odd behaviour, without the = sign the QueryString object returned by the Request has a Count of 1 with a value of MyTest and a key of null.
You could test the QueryString to see if it contains the value you are expecting:

if(Request.QueryString.ToString().Contains("MyTest"))
{
    // Do stuff
}

编辑：这个回答给出进一步的解释，什么是无钥匙参数回事（滚过接受的答案）。

this answer gives a bit more explanation as to what is going on with keyless parameters (scroll past the accepted answer).

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