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· 15 min read
Adnan Rafiq
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The word Host will repeatedly appear in the post so let's briefly understand what it means?

What is Host?​

The Host is a container which offers rich built-in services such as Dependency Injection, Configuration, Logging, Host Services and others. The NET 6 offers Generic DefaultHost which can be configured to handle the activities as per your use case. Two major variations of the Host are:

  • Console Host - CLI based applications.
  • Web Host - Web API & Applications.

Think of it as Airbnb Host who keeps the property ready to serve when the guests arrive. The property offers a different set of services and allows you to bring your own services. The lifetime of such services depends upon the contract, which the Host controls.

Basic Host Example : Create, configure, build, and run the Host
var host = Host.CreateDefaultBuilder(args) //WebHost.CreateDefaultBuilder(args)  
    .ConfigureLogging( (context, builder) => builder.AddConsole())
    .Build(); // Build the host, as per configurations.

await host.RunAsync();

What is Hosted Service?​

A service that performs the work in the background mostly does not offer an interface to interact. In technical terms, any reference type object which implements the IHostedService interface is a background/hosted/worker service.

Terms such as Worker, Windows Service, and Background Task refer to HostedService based on context. In Windows Server, Widows Service is how you deploy a Hosted Service. Background Task or Hosted service runs as part of .NET Web Host, and it runs in the same operating system process.