System.TypeLoadException: 'Could not load type 'System.Web.HttpContextBase' from assembly 'System.Web,

Question

Whenever I try to load the Chart using System.Web.Helpers namespace in Asp.net Core I get this Exception.

System.TypeLoadException: 'Could not load type 'System.Web.HttpContextBase' from assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.'

new System.Web.Helpers.Chart(width: 800, height: 200).AddTitle("My Chart").AddSeries(chartType: "column", 
           xValue: new[] { _context.DemoTable.Select(o => o.Month) },
           yValues: new[] { _context.DemoTable.Select(o => o.AutomationPercentage) }
          ).Write("png");

What am I doing wrong here??

Vulvitis

System.Web.HttpContextBase is part of System.Web assembly. .NET core by default does not add reference of this DLL, and it is also not preferred to do so. I think System.Web.Helpers is .NET Framework library and not .NET Core – Bellbird

Thanks for the reply.. Can you please tell me which library do I need to add so as to get this work. – Vulvitis

Answer 1

the class exists in other namespace so make sure you're using Microsoft.AspNetCore.Mvc and not the .NET framework version.

Loggins

I get this error while trying to test .NET Framework code from a xUnit .NET Core unit test. What do I need to add to my .NET core project to make this work? – Oceanography

Can you please explain what you mean in a bit more detail, what is the namespace we need to reference for the MVC .NET Core version? – Maestricht

Answer 2

I believe you have installed packages that are targeting only for Net MVC and therefore has a dependencies on System.Web.HttpContextBase which don't exist in Net Core. To fix this issue you need to find which package you installed don't have support for your Net core and install an alternative

Ruisdael

Answer 3

In the project dependencies, look the one with warnings, remove them. That should do the trick

Attitude

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center. – Tarrance

Answer 4

Removed all Microsoft.Aspnet.* and also Microsoft.Web.Infrastructure from References

Amora