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Replace WebHostBuilder with HostBuilder pattern in MVC folder #62703

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02299e4
Initial plan
Copilot Jul 14, 2025
23e48c6
Transform first 3 files from WebHostBuilder to HostBuilder pattern
Copilot Jul 14, 2025
531bb5f
Transform Program.cs files and benchmark apps from WebHostBuilder to …
Copilot Jul 14, 2025
749289e
Complete transformation of all remaining Startup.cs files from WebHos…
Copilot Jul 14, 2025
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21 changes: 13 additions & 8 deletions src/Mvc/perf/benchmarkapps/BasicApi/Startup.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Migrations;
Expand Down Expand Up @@ -229,25 +230,29 @@ private void DropDatabaseTables(IServiceProvider services)

public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args)
using var host = CreateHost(args)
.Build();

host.Run();
}

public static IWebHostBuilder CreateWebHostBuilder(string[] args)
public static IHostBuilder CreateHost(string[] args)
{
var configuration = new ConfigurationBuilder()
.AddEnvironmentVariables()
.AddCommandLine(args)
.Build();

return new WebHostBuilder()
.UseKestrel()
.UseUrls("http://+:5000")
.UseConfiguration(configuration)
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>();
return new HostBuilder()
.ConfigureWebHost(webHostBuilder =>
{
webHostBuilder
.UseKestrel()
.UseUrls("http://+:5000")
.UseConfiguration(configuration)
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>();
});
}
}
}
23 changes: 14 additions & 9 deletions src/Mvc/perf/benchmarkapps/BasicViews/Startup.cs
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Expand Up @@ -8,6 +8,7 @@
#endif
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Migrations;
Expand Down Expand Up @@ -191,26 +192,30 @@ private void DropDatabaseTables(IServiceProvider services)

public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args)
using var host = CreateHost(args)
.Build();

host.Run();
}

public static IWebHostBuilder CreateWebHostBuilder(string[] args)
public static IHostBuilder CreateHost(string[] args)
{
var configuration = new ConfigurationBuilder()
.AddEnvironmentVariables()
.AddCommandLine(args)
.Build();

return new WebHostBuilder()
.UseKestrel()
.UseUrls("http://+:5000")
.UseConfiguration(configuration)
.UseIISIntegration()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>();
return new HostBuilder()
.ConfigureWebHost(webHostBuilder =>
{
webHostBuilder
.UseKestrel()
.UseUrls("http://+:5000")
.UseConfiguration(configuration)
.UseIISIntegration()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>();
});
}
}
}
21 changes: 13 additions & 8 deletions src/Mvc/perf/benchmarkapps/RazorRendering/Startup.cs
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Expand Up @@ -4,6 +4,7 @@
using Data;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Html;
Expand Down Expand Up @@ -60,24 +61,28 @@ private static List<DataB> GenerateDataB()

public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args)
using var host = CreateHost(args)
.Build();

host.Run();
}

public static IWebHostBuilder CreateWebHostBuilder(string[] args)
public static IHostBuilder CreateHost(string[] args)
{
var configuration = new ConfigurationBuilder()
.AddEnvironmentVariables()
.AddCommandLine(args)
.Build();

return new WebHostBuilder()
.UseKestrel()
.UseUrls("http://+:5000")
.UseConfiguration(configuration)
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>();
return new HostBuilder()
.ConfigureWebHost(webHostBuilder =>
{
webHostBuilder
.UseKestrel()
.UseUrls("http://+:5000")
.UseConfiguration(configuration)
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>();
});
}
}
28 changes: 17 additions & 11 deletions src/Mvc/samples/MvcSandbox/Startup.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.Extensions.Hosting;

namespace MvcSandbox;

public class Startup
Expand Down Expand Up @@ -42,22 +44,26 @@ static void ConfigureEndpoints(IEndpointRouteBuilder endpoints)

public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args)
using var host = CreateHost(args)
.Build();

host.Run();
}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
new WebHostBuilder()
.UseContentRoot(Directory.GetCurrentDirectory())
.ConfigureLogging(factory =>
public static IHostBuilder CreateHost(string[] args) =>
new HostBuilder()
.ConfigureWebHost(webHostBuilder =>
{
factory
.AddConsole()
.AddDebug();
})
.UseKestrel()
.UseStartup<Startup>();
webHostBuilder
.UseContentRoot(Directory.GetCurrentDirectory())
.ConfigureLogging(factory =>
{
factory
.AddConsole()
.AddDebug();
})
.UseKestrel()
.UseStartup<Startup>();
});
}

19 changes: 12 additions & 7 deletions src/Mvc/test/WebSites/ApiExplorerWebSite/Startup.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
using ApiExplorerWebSite.Controllers;
using Microsoft.AspNetCore.Mvc.Formatters;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.Extensions.Hosting;

namespace ApiExplorerWebSite;

Expand Down Expand Up @@ -45,17 +46,21 @@ public void Configure(IApplicationBuilder app)

public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args)
using var host = CreateHost(args)
.Build();

host.Run();
}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
new WebHostBuilder()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseKestrel()
.UseIISIntegration()
.UseStartup<Startup>();
public static IHostBuilder CreateHost(string[] args) =>
new HostBuilder()
.ConfigureWebHost(webHostBuilder =>
{
webHostBuilder
.UseContentRoot(Directory.GetCurrentDirectory())
.UseKestrel()
.UseIISIntegration()
.UseStartup<Startup>();
});
}

20 changes: 13 additions & 7 deletions src/Mvc/test/WebSites/ApplicationModelWebSite/Startup.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.Extensions.Hosting;

namespace ApplicationModelWebSite;

public class Startup
Expand Down Expand Up @@ -34,17 +36,21 @@ public void Configure(IApplicationBuilder app)

public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args)
using var host = CreateHost(args)
.Build();

host.Run();
}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
new WebHostBuilder()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>()
.UseKestrel()
.UseIISIntegration();
public static IHostBuilder CreateHost(string[] args) =>
new HostBuilder()
.ConfigureWebHost(webHostBuilder =>
{
webHostBuilder
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>()
.UseKestrel()
.UseIISIntegration();
});
}

27 changes: 18 additions & 9 deletions src/Mvc/test/WebSites/BasicWebSite/Program.cs
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Original file line number Diff line number Diff line change
@@ -1,20 +1,29 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.Extensions.Hosting;

namespace BasicWebSite;

public class Program
{
public static void Main(string[] args) => CreateWebHostBuilder(args).Build().Run();
public static void Main(string[] args)
{
using var host = CreateHost(args).Build();
host.Run();
}

// Do not change. This is the pattern our test infrastructure uses to initialize a IWebHostBuilder from
// a users app.
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
new WebHostBuilder()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<StartupWithoutEndpointRouting>()
.UseKestrel()
.UseIISIntegration();
// This method now returns IHostBuilder and uses the new pattern with HostBuilder and ConfigureWebHost
public static IHostBuilder CreateHost(string[] args) =>
new HostBuilder()
.ConfigureWebHost(webHostBuilder =>
{
webHostBuilder
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<StartupWithoutEndpointRouting>()
.UseKestrel()
.UseIISIntegration();
});
}

public class TestService
Expand Down
19 changes: 12 additions & 7 deletions src/Mvc/test/WebSites/ControllersFromServicesWebSite/Startup.cs
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Expand Up @@ -6,6 +6,7 @@
using ControllersFromServicesWebSite.Components;
using ControllersFromServicesWebSite.TagHelpers;
using Microsoft.AspNetCore.Mvc.ApplicationParts;
using Microsoft.Extensions.Hosting;

namespace ControllersFromServicesWebSite;

Expand Down Expand Up @@ -61,17 +62,21 @@ public void Configure(IApplicationBuilder app)

public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args)
using var host = CreateHost(args)
.Build();

host.Run();
}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
new WebHostBuilder()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>()
.UseKestrel()
.UseIISIntegration();
public static IHostBuilder CreateHost(string[] args) =>
new HostBuilder()
.ConfigureWebHost(webHostBuilder =>
{
webHostBuilder
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>()
.UseKestrel()
.UseIISIntegration();
});
}

20 changes: 13 additions & 7 deletions src/Mvc/test/WebSites/CorsWebSite/Program.cs
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Original file line number Diff line number Diff line change
@@ -1,22 +1,28 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.Extensions.Hosting;

namespace CorsWebSite;

public class Program
{
public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args)
using var host = CreateHost(args)
.Build();

host.Run();
}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
new WebHostBuilder()
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>()
.UseKestrel()
.UseIISIntegration();
public static IHostBuilder CreateHost(string[] args) =>
new HostBuilder()
.ConfigureWebHost(webHostBuilder =>
{
webHostBuilder
.UseContentRoot(Directory.GetCurrentDirectory())
.UseStartup<Startup>()
.UseKestrel()
.UseIISIntegration();
});
}
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