在Visual Studio 2017中安装Microsoft.Net.Http时出现Nuget错误Microsoft.Bcl.Build

Question

I have a project in Xamarin Forms and I want to consume service from an external page. I am trying to install the package Microsoft.Net.Http to consume such services and gives me the following error:

Could not install package 'Microsoft.Bcl.Build 1.0.14'. You are trying to install this package in a project that has 'MonoAndroid, Version = v6.0' as the destination, but the package does not contain assembly references or content files that support that framework. For more information, contact the author of the package. 0]

Answer 1

In the error message there must be specified the Target Framework Version which is in conflict with Xamarin.Forms v6.0 If you have a "packages.config" file in your Droid project, look for this line inside:

<package id="Xamarin.Forms" version="2.4.0.280" targetFramework="monoandroid71" />

And replace "monoandroid60" with the proper one. I had this trouble installing Microsoft.Net.Http and I could resolve with it. Just try...

On the other hand, if you can try with System.Net.Http package, last version is only some days ago. I hope it helps.

Answer 2

Just had the same or similar issue and solved it by manually installing the Microsoft.Bcl nuget package before installing the Microsoft.Net.Http package.

It might also help to update the Xamarin nuget packages.

(Idea from Workaround mentioned here: Source )