Why do we need WebHost or Host (generic host) in .Net Core?

Yes. In fact, all ASP.NET Core applications are self-hosted. Even in production, IIS/Nginx/Apache are a reverse proxy for the self-hosted application. In a reasonably standard Program.cs class, you can see the self-hosting. The IISIntegration is optional - it's only necessary if you want to integrate with IIS.

public class Program
{
public static void Main(string[] args)
{
var config = new ConfigurationBuilder()
.AddCommandLine(args)
.AddEnvironmentVariables(prefix: "ASPNETCORE_")
.Build();
var host = new WebHostBuilder()
.UseConfiguration(config)
.UseKestrel()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseIISIntegration()
.UseStartup()
.Build();
host.Run();
}
}

1 Reply

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Madan Shekar5y ago
Yes. In fact, all ASP.NET Core applications are self-hosted. Even in production, IIS/Nginx/Apache are a reverse proxy for the self-hosted application. In a reasonably standard Program.cs class, you can see the self-hosting. The IISIntegration is optional - it's only necessary if you want to integrate with IIS.
public class Program
{
    public static void Main(string[] args)
    {
        var config = new ConfigurationBuilder()
            .AddCommandLine(args)
            .AddEnvironmentVariables(prefix: "ASPNETCORE_")
            .Build();

        var host = new WebHostBuilder()
            .UseConfiguration(config)
            .UseKestrel()
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseStartup()
            .Build();

        host.Run();
    }
}