How does Configuration work in ASP.NET Core?

Question

Aryan Kumar · Answer

In ASP.NET Core, configuration is used to store application settings, such as database connection strings, API keys, and other configuration data.

The configuration system in ASP.NET Core is based on the IConfiguration interface. The IConfiguration interface provides a way to access configuration data from within your application.

There are a number of ways to add configuration data to an ASP.NET Core application. You can add configuration data to the application by:

Adding configuration data to a configuration file, such as appsettings.json or web.config.
Adding configuration data to the environment, such as environment variables or command-line arguments.
Adding configuration data programmatically, using the IConfiguration interface.

Once you have added configuration data to your application, you can access it from within your application by using the IConfiguration interface.

The following is an example of how to access configuration data from within your application:

C#

using Microsoft.AspNetCore.Hosting;

namespace MyApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // Create a configuration object
            var configuration = new ConfigurationBuilder()
                .AddCommandLine(args)
                .Build();

            // Get the database connection string from the configuration
            string connectionString = configuration["ConnectionStrings:MyDatabase"];

            // Use the database connection string to connect to the database
            var database = new MyDatabase(connectionString);

            // Do something with the database
            database.DoSomething();
        }
    }
}

In this example, we first create a configuration object by calling the ConfigurationBuilder() constructor. We then add the command-line arguments to the configuration object by calling the AddCommandLine() method. Finally, we get the database connection string from the configuration object by calling the ["ConnectionStrings:MyDatabase"] property.

We can then use the database connection string to connect to the database and do something with the database.

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How does Configuration work in ASP.NET Core?

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