vb.net - HttpRequest.ServerVariables 与 HttpRequest.UserAgent 属性 VB.net

Question

用于确定用户代理的这两个属性之间有什么区别(如果有)和优点/缺点？

Dim strUserAgt as String
userAgent = Request.userAgent

对比

Dim strUserAgt as String = Request.ServerVariables("HTTP_USER_AGENT")

Answer 1

来源:How to determine browser type in server-side code without the BrowserType object in ASP.NET

In ASP.NET, you can access the Request.ServerVariables collection or use the new Request.UserAgent property to retrieve the HTTP_USER_AGENT header value.

没有区别，两者都会检索相同的东西 HTTP_USER_AGENT header value .

查询 Request.ServerVariables Collection和 IIS Server Variables如果你想深入挖掘它。这些服务器变量集合值在某种程度上也取决于 IIS 版本。