What is Host in ASP.NET Core?

Ashutosh Patel 573 06 Mar 2023

1 Answers

Aryan Kumar 08 Jul 2023

In ASP.NET Core, a host is an object that is responsible for running an ASP.NET Core application. It is responsible for starting the application, handling requests, and shutting down the application when it is finished.

The host is implemented as a class that implements the IHost interface. The IHost interface has a number of methods that are used to start, handle requests, and shut down the application.

The following is an example of a host class:

using Microsoft.AspNetCore.Hosting;

namespace MyApp
{
    public class MyHost : IHost
    {
        public void Start()
        {
            // Start the application
        }

        public void HandleRequest(HttpContext context)
        {
            // Handle a request
        }

        public void Shutdown()
        {
            // Shut down the application
        }
    }
}

To create a host object, you can use the CreateHostBuilder() method of the Microsoft.AspNetCore.Hosting.HostingBuilder class. The CreateHostBuilder() method takes a configuration object as its parameter. The configuration object can be used to configure the application, such as the port number that the application will listen on.

The following is an example of how to create a host object:

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();

            // Create a host object
            var host = new MyHost();

            // Start the host object
            host.Start();

            // Wait for the host object to shut down
            host.WaitForShutdown();
        }
    }
}

Once you have created a host object, you can start it by calling the Start() method. The Start() method will start the application and listen for requests.

To handle a request, you can call the HandleRequest() method of the host object. The HandleRequest() method takes a HttpContext object as its parameter. The HttpContext object contains information about the request, such as the URL, the headers, and the body of the request.

To shut down the host object, you can call the Shutdown() method. The Shutdown() method will shut down the application and release any resources that it is using.

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What is Host in ASP.NET Core?

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