Configuration Providers - (ASP.NET Core Configuration)

ASP.NET Core is an open-source framework that provides a number of features for building web applications. One of these features is the Configuration framework, which is used to provide application configuration data to different parts of the application.

In this page, we'll be discussing Configuration Providers in ASP.NET Core, including syntax, examples, output, explanation, use, important points, and a summary.

Syntax

ASP.NET Core Configuration Providers are used to load configuration data from different sources. The syntax for using Configuration Providers is as follows:

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
    WebHost.CreateDefaultBuilder(args)
        .ConfigureAppConfiguration((hostingContext, config) =>
        {
            config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);
            config.AddEnvironmentVariables();
        })
        .UseStartup<Startup>();

This code adds a provider that will load configuration data from a json file and from environment variables.

Example

Here's an example of how to use Configuration Providers in a C# ASP.NET Core application:

using System;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace MySampleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .ConfigureAppConfiguration((hostingContext, config) =>
                {
                    var env = hostingContext.HostingEnvironment;

                    config.SetBasePath(env.ContentRootPath);
                    config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                          .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);
                    config.AddEnvironmentVariables();
                })
                .ConfigureLogging((hostingContext, logging) =>
                {
                    logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
                    logging.AddConsole();
                    logging.AddDebug();
                })
                .UseStartup<Startup>();
    }
}

In this example, the ConfigureAppConfiguration method is used to add configuration providers that can load configuration data from various sources.

Output

Configuration Providers provide a way to load configuration data from different sources including, JSON files, environment variables, command-line arguments, and source code. After the configuration data is loaded, it is then stored in an IConfiguration object.

Explanation

In ASP.NET Core, configuration data is loaded by configuration providers. Configuration providers can load data from various sources such as JSON files, environment variables, command-line arguments, and source code.

The Configuration object can be used to access configuration data stored by the providers. The IConfiguration object is immutable, which means that it cannot be modified after it is loaded.

Use

Configuration Providers are used to load configuration data into an IConfiguration object. This data can then be accessed by other parts of the application such as controllers, middleware, services, or views.

Important Points

• Configuration Providers are used to load configuration data into an IConfiguration object.
• The IConfiguration object is immutable, which means that it cannot be modified after it is loaded.
• Configuration Providers can load data from various sources.

Summary

This page covered Configuration Providers in ASP.NET Core. We looked at the syntax for using Configuration Providers, provided an example and output of using Configuration Providers, explained how Configuration Providers work, showed how to use Configuration Providers in an ASP.NET Core application, and highlighted some important points to keep in mind. Configuration Providers are an important part of ASP.NET Core and enable developers to build robust, configurable and scalable applications.