How to and is good practice to create generic Host class extension methods in ASPNETCORE 3?

Question

In typical aspnet core application. As a example of Program.cs

var host = new HostBuilder()
      .Build(); 

   await host.RunAsync(); 

How we must declare if we wish to extend HostBuilder capablites with extension methods as when using "CreateDefaultBuilder()" with IWebHost in netcore <2.2.

Answer 1

To create IHostBuilder extension method.

Begins creating a static class with static methods (public) Import to the client that is going to use the method.

Declaration is as follows:

public static class MyHostHostBuilderExtension
    {
        public static IHostBuilder CreateMyBuilder(this IHostBuilder hostBuilder)
[...]

In the Program.cs use a HostBuilder() instance.

var host = new HostBuilder().CreateMyBuilder().Build();

Notice if you using Host static class. It can't be extended.