httputility does not exist in current context in framework 3.5

问题

I'm trying to use HttpUtility.UrlEncode in my sharepoint project in the framework 3.5 but it doesn't recognise it. Simply saying :

HttpUtility does not exist in current context

I called System.Web but it still doesn't recognise none of the Http objects !

回答1:

You need to add a reference to System.Web.dll

A using System.Web without the above reference will not suffice alone.

Unfortunately, the System.Web.dll cannot be referenced in a project that targets a Client Profile version of the .Net framework. So look at your project properties and make sure it targets ".NET Framework 3.5" and not ".NET Framework 3.5 Client Profile".

回答2:

This question was answered here: Alternative to HttpUtility for .NET 3.5 SP1 client framework?

Another option if possible is to upgrade to .NET 4.5 then you have the option of using

WebUtility.UrlEncode 

http://msdn.microsoft.com/en-us/library/system.net.webutility.urlencode.aspx

来源：https://stackoverflow.com/questions/15020802/httputility-does-not-exist-in-current-context-in-framework-3-5