CODEWITHSUNDEEP
c#visual-studio
Estrixx
Estrixx

Reputation: 3

App.config key values are not being found using when referenced with ConfigurationManager.AppSettings

On Visual Studio Community 2017 V15.9.19 I created a new .Net Core NUnit test project, I added a Nuget package for system.configuration.configurationManager and created a App.config file within the same project.

The app.config file looks like this:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="browser" value ="chrome"/>
  </appSettings>
</configuration>

I've tried referencing a key value using the below test:

using NUnit.Framework;
using System;
using System.Configuration;
using System.Reflection;

namespace Tests
{
    public class Tests
    {
        [Test]
        public void GetConfigValue()
        {
            string setting = "browser";

            string a = ConfigurationManager.AppSettings[setting];
            string b = ConfigurationManager.OpenExeConfiguration(Assembly.GetExecutingAssembly().Location).AppSettings.Settings[setting].Value;
            Console.WriteLine($"a returns: { a } \nb returns: { b }");
        }
    }
}

This gives an output of:

a returns:
b returns: chrome

This is because a is null. I've referenced keys using the a method previously I have no idea why I'm not able to currently.

Is there a setting or anything in Visual Studio which causes this as it was happening on another project so I tried making a new solution and project and it's happening there as well.

I can work around the issue using method b but I'm trying to fix my setup so I can reference keys in the config normally again.

Upvotes: 0

Views: 1480

Answers (1)

reynoldsbj
reynoldsbj

Reputation: 339

.NET Core uses appsettings.json instead of app.config by default. Here is another post on how to use an app.config instead, and here is a post on using appsettings.json values in a test project.

Upvotes: 1

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