C# 在 .NET 4.5 中找不到 HttpClient
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HttpClient is not found in .NET 4.5
提问by Joan Venge
I am trying to use the new HttpClientin .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.
我试图HttpClient在 .NET 4.5 中使用新的，但 Visual Studio 抱怨它不存在。我有System.Net，但是当我输入时System.Net.Http，它也会抱怨。
Am I supposed to download a new distributable for this class?
我应该为这个类下载一个新的可分发文件吗？
采纳答案by ulrichb
Add a reference to System.Net.Http:
添加对以下内容的引用System.Net.Http：
回答by The Sammie
I had the same problem. After some digging around, i found you had to install this packageand then add the reference to System.Net.Httpfor it to not complain!
我有同样的问题。经过一番挖掘，我发现你必须安装这个包，然后添加System.Net.Http对它的引用才不会抱怨！
回答by johnbuen
I encountered the issue when I added a class inside the App_Codefolder having this HttpClientcalled in one of my function. Upon spending countless hours I found that the Build Actionunder Propertiesfor my class is set to Content.
当我在App_Code文件夹中添加一个类时遇到了这个问题，这个类在HttpClient我的一个函数中被调用。花了无数个小时后，我发现我班级的Build ActionunderProperties设置为Content.
Changing this Build Actionto Compilefixed the problem.
更改此设置Build Action以Compile解决问题。
回答by WindyHen
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.
开始使用vs2017，遇到同样的问题，在创建Native + PCL时，找不到HttpClient，去Nuget获取Microsoft.Net.Http解决我的问题。
