HttpClient is not found in .NET 4.5

问题:

I am trying to use the new HttpClient in .NET 4.5, but Visual Studio complains that it doesn't exist. I have System.Net, but when I type System.Net.Http, it complains for that too.

Am I supposed to download a new distributable for this class?

回答1:

Add a reference to System.Net.Http:

回答2:

I had the same problem. After some digging around, i found you had to install this package and then add the reference to System.Net.Http for it to not complain!

回答3:

Start using vs2017, and encounter same problem, when creating Native + PCL, couldn't find the HttpClient, going to Nuget and get Microsoft.Net.Http solve my problems.

回答4:

I encountered the issue when I added a class inside the App_Code folder having this HttpClient called in one of my function. Upon spending countless hours I found that the Build Action under Properties for my class is set to Content.

Changing this Build Action to Compile fixed the problem.