ASP.NET Core—access Configuration from static class

Question

I want a simple static class that accesses the Configuration object. All the config info is already read in from the appsettings.json file in the Startup class. I just need an e

Answer 1

I agree with mcbowes, it's in the docs, but the first example looks more like what you need...want:

public class Program
{
    public static IConfigurationRoot Configuration { get; set; }
    public static void Main(string[] args = null)
    {
        var builder = new ConfigurationBuilder()
             .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json");

        Configuration = builder.Build();

        Console.WriteLine($"option1 = {Configuration["option1"]}");

        // Edit:
        IServiceCollection services = new ServiceCollection();
        services.AddOptions();
        services.Configure<HelloWorldOptions>(_configuration.GetSection("HelloWorld"));
        // And so on...
    }
}

Answer 2

The IConfiguration is Injectable anywhere within the Project. But in the case of static class, the option I am using and maybe only approach... var Configuration = new ConfigurationBuilder() .AddUserSecrets<Startup>() .Build(); And, you can add required section, such in this code block above, I added 'UserSecrets'.

Answer 3

If you are using environment variables as your configuration, you can access the environment variable directly rather than via the configuration object.

using System;

namespace My.Example
{
    public static class GetPaths
    {
        private static readonly string MyPATH = 
            Environment.GetEnvironmentVariable("PATH");

        private static readonly string MySpecialPath =
            Environment.GetEnvironmentVariable("PREFIX_SpecialPath");
        ...
    }
}

Answer 4

Personally I like the method used in this link

Essentially it just adding a static field to your options class.

 public class WeblogConfiguration
 {
    public static WeblogConfiguration Current;

    public WeblogConfiguration()
    {
        Current = this;
    }
} 

Then in any static class you can do:

WeblogConfiguration.Current

Simple and very straight forward

Answer 5

I think you could use extension function, something like this

public static string ConfigToSomeThing(this IConfiguration config, int value)
        {
            return config[value.ToString()] ?? "";
        }

Then any place , just injection IConfiguration and use extension method

_systemConfiguration.ConfigToSomeThing(123);

Answer 6

Consider using the instructions here for ASP.NET Core Configuration.

You can create a class to store your configuration settings and then access the values, something like this:

_config.UserName

In Startup - ConfigureServices:

services.Configure<Config>(Configuration.GetSections("General"));

Then just inject your object wherever you need as:

IOptions<Config> config