当前包源中找不到包

Question

我是编程领域的新手。我正在尝试安装一些nuget包。但是，我收到了以上信息。任何人都可以帮助我吗？

Answer 1

    Got to Tools -> NuGet package manager -> Package manager Settings  -> Expand  NuGet Package manager  from left side Menu option ->  Select Package Sources  -> Click on the checkbox of  nuget.org  package. -> Click OK 

Now right click on Project -> Click on Manage NuGet Packages.