Is ConfigurationManager AppSettings available in NET Core 2 0

Question

I ve got a method that reads settings from my config file like this    var value   ConfigurationManager AppSettings key     It compiles fine when targeting  NET Standard 2 0 only    Now I need multiple targets  so I updated my project file with     lt TargetFrameworks gt netcoreapp2 0 net461 netstandard2 0 lt  TargetFrameworks gt    But now  the compilation fails for netcoreapp2 0 with the following error message    Error   CS0103  The name  ConfigurationManager  does not exist in the current context    netcoreapp2 0    Separately  I created a new  NET Core 2 0 console application  only targeting  NET Core 2 0 this time   but likewise there seems to be no ConfigurationManager under the namespace System Configuration    I m quite confused because it s available under  NET Standard 2 0  so I would expect it to be available in  NET Core 2 0  as  NET Core 2 0 is  NET Standard 2 0 compliant    What am I missing

User · Answer

The latest set of guidance is as follows: (from https://docs.microsoft.com/en-us/azure/azure-functions/functions-dotnet-class-library#environment-variables)

Use:

System.Environment.GetEnvironmentVariable(name, EnvironmentVariableTarget.Process);

From the docs:

public static class EnvironmentVariablesExample
{
    [FunctionName("GetEnvironmentVariables")]
    public static void Run([TimerTrigger("0 */5 * * * *")]TimerInfo myTimer, ILogger log)
    {
        log.LogInformation($"C# Timer trigger function executed at: {DateTime.Now}");
        log.LogInformation(GetEnvironmentVariable("AzureWebJobsStorage"));
        log.LogInformation(GetEnvironmentVariable("WEBSITE_SITE_NAME"));
    }

    public static string GetEnvironmentVariable(string name)
    {
        return name + ": " +
            System.Environment.GetEnvironmentVariable(name, EnvironmentVariableTarget.Process);
    }
}

App settings can be read from environment variables both when developing locally and when running in Azure. When developing locally, app settings come from the Values collection in the local.settings.json file. In both environments, local and Azure, GetEnvironmentVariable("<app setting name>") retrieves the value of the named app setting. For instance, when you're running locally, "My Site Name" would be returned if your local.settings.json file contains { "Values": { "WEBSITE_SITE_NAME": "My Site Name" } }.

The System.Configuration.ConfigurationManager.AppSettings property is an alternative API for getting app setting values, but we recommend that you use GetEnvironmentVariable as shown here.

User · Answer

Yes  ConfigurationManager AppSettings is available in  NET Core 2 0 after referencing NuGet package System Configuration ConfigurationManager    Credits goes to  JeroenMostert for giving me the solution

User · Answer

I know it s a bit too late  but maybe someone is looking for easy way to access appsettings in  net core app  in API constructor add the following  public class TargetClassController   ControllerBase       private readonly IConfiguration  config       public TargetClassController IConfiguration config                 config   config              HttpGet  quot  id int  quot        public async Task lt ActionResult lt DTOResponse gt  gt  Get int id                var config    config  quot YourKeySection key quot

User · Answer

You can use Configuration to resolve this    Ex  Startup cs     You can pass by DI to the controllers after this implementation   public class Startup       public Startup IHostingEnvironment env                var builder   new ConfigurationBuilder            SetBasePath env ContentRootPath           AddJsonFile  appsettings json   optional  true  reloadOnChange  true            Configuration   builder Build                public IConfiguration Configuration   get            This method gets called by the runtime  Use this method to add services to the container      public void ConfigureServices IServiceCollection services                 var microserviceName   Configuration  microserviceName            services AddSingleton Configuration

User · Answer

I installed System Configuration ConfigurationManager from Nuget into my  net core 2 2 application   I then reference using System Configuration   Next  I changed   WebConfigurationManager AppSettings  to     ConfigurationManager AppSettings   So far I believe this is correct  4 5 0 is typical with  net core 2 2  I have not had any issues with this

User · Answer

Once you have the packages setup  you ll need to create either an app config or web config and add something like the following    lt configuration gt     lt appSettings gt       lt add key  key  value  value   gt     lt  appSettings gt   lt  configuration gt

[c#] Is ConfigurationManager.AppSettings available in .NET Core 2.0?

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