Conversion from .NET framework 4.6 to 4.8

Question

I have converted my web api framework target from 4.6.2 --> 4.8, this is the error I get after I change target framework and reinstalling nuget packages:-

The type initializer for 'System.Web.Http.GlobalConfiguration' threw an exception.. error ASPRUNTIME.

My web config have information of old library and new as below:-

<dependentAssembly>
<assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-4.2.0.0" newVersion="4.2.0.0" />
</dependentAssembly>

Can anyone suggest what is problem here. Thanks for help.

Answer 1

Hi @Dutta, Pijush ,
As far as I think,there are two ways you could try:
1.Open ‘Package Manager Console’ and select the project present where WebAPI is present and run the following code:

Install-Package Microsoft.AspNet.WebApi -IncludePrerelease  

2.From ‘Manage NuGet Packages’ from Tools > NuGet Package Manager uninstall WebAPI libraries and reinstall WebAPI new libraries, where in you may find back missing libraries.

Best regards,
Yijing Sun

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Answer 2

install Microsoft.AspNet.WebApi.Client 5.2.7 nuget package and try to run the app.

If this does not work, try commenting on this line.

<bindingRedirect oldVersion="0.0.0.0-4.2.0.0" newVersion="4.2.0.0" />