C# ASP.NET work with Google.Authenticator

Question

I am currently develop an new page for my web application using C# asp.net. My purpose is to use google authenticator as a 2FA authentication.

Below is my code.

using Google.Authenticator;

Dictionary<String, String> result = new Dictionary<String, String>();
TwoFactorAuthenticator tfa = new TwoFactorAuthenticator();
var setupInfo = tfa.GenerateSetupCode("XXXX", "TITLEXXX", "CODEXXXX", 300, 300);

var result = tfa.ValidateTwoFactorPIN("XXSSWWW", "XXXXWWW"); 

But in tfa.GenerateSetupCode and tfa.ValidateTwoFactorPIN there is an error as below show.

The type "Object" is defined in an assembly that is not referenced. You must add a reference to assembly 'netstand. version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'

I tried to search online for the solutions. What I have tried:

• Change my web application Target Framework from .NetFramework 4.6.1 to .NetFramework 4.8
• Uninstall and reinstall Google.Authenticator 3.0.0 nuget package.

But above action is not helping me to solve the solution. Anyone know what the issue is and how to solve it?

Answer 1

You need to install the .NET Standard 2.0 nuget package. Right click on your Project in Visual Studio and Browse for NETStandard.Library