Epic: Minimal hosting and actions

[halter73]

Vision

#!/usr/bin/env dotnet run

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddSqlite<Todo>(builder.Configuration["connectionString"] ?? "Data Source=todos.db");

var app = builder.Build();

// ...

// Step 5: Input validation
app.MapPost("/todos", async (Validated<Todo> inputTodo, TodoDb db) =>
{
    var (todo, isValid) = inputTodo;
    if (!isValid) return Problem(inputTodo);

    db.Todos.Add(todo);
    await Todos.SaveChangesAsync();

    return CreatedAt(routes.GetTodo.Url(todo.Id), todo);
};

app.Run();

// ...

From: #30580 User learning arc for new minimal/focused ASP.NET Core API experience

Minimal Action Feature Work

• Implement a minimal version of MapAction  #29684 Implement a minimal version of MapAction
• Add benchmarks for MapAction #29915 Add benchmarks for MapAction
• Add new "MapAction" overloads #30448 Add new "MapAction" overloads
• Add API to turn delegate or MethodInfo into a RequestDelegate  #31181 Add API to turn delegate or MethodInfo into a RequestDelegate
• Add OpenAPI/Swagger support to minimal actions #30662 Add OpenAPI/Swagger support to minimal actions
• Create IResult-returning static methods  #33729 Create IResult-returning static methods
• Add IResult implementations for more IActionResults #32565 Add IResult implementations for more IActionResults
• RequestDelegateFactory should produce clear errors for invalid Delegates #30322 RequestDelegateFactory should produce clear errors for invalid Delegates
• Use CultureInfo.InvariantCulture when TryParsing minimal action parameters #32377 Use CultureInfo.InvariantCulture when TryParsing minimal action parameters
• Add easier way to name endpoints for easier link generation #33687 Add easier way to name endpoints for easier link generation Cut
• Use nullibility to infer optionality of service and body parameters #32375 Use nullibility to infer optionality of service and body parameters
• Infer collection interfaces like IList come from the body in minimal actions #32376 Infer collection interfaces like IList come from the body in minimal actions Cut
• Design validation for Minimal APIs #30666 Design validation for minimal actions (cut for .NET 6)
• Use InferFromServicesAttribute to infer non-interface parameters in minimal actions come from services #32563 Use InferFromServicesAttribute to infer non-interface parameters in minimal actions come from services Replaced by Detect services based on service provider #32737
• Enable customization of input and output formatting in MapAction #30668 Enable customization of input and output formatting for minimal actions (out of scope?)
• Add linker-friendly Roslyn source gen version of RequestDelegateFactory #30670 Add linker-friendly Roslyn source gen version of RequestDelegateFactory

Minimal Hosting Feature Work

• "Minimal hosting" for ASP.NET Core applications #30354 "Minimal hosting" for ASP.NET Core applications
• ResolveServiceProviderFactory should work with Minimal Hosting #31861 ResolveServiceProviderFactory should work with Minimal Hosting
• Support the new top level statements with WebApplicationFactory #33462 Make WebApplicationFactory work with top level statements (without CreateHostBuilder entry point)
• Add default global usings to Microsoft.NET.Sdk.Web #32451 Add default global usings to Microsoft.NET.Sdk.Web
• Add better certificate configuration support to WebApplication #32124 Add better certificate configuration support to WebApplication Cut

Minimal Hosting Bugs

• Web root is incorrect when using new minimal hosting API (WebApplication.CreateBuilder)  #32415 Web root is incorrect when using the minimal host
• Minimal host does not read environment specific configuration for logging #32383 Minimal host does not read environment specific configuration
• WebApplication.CreateBuilder potentially inefficient, results in many file system checks #32432 [Perf] WebApplication.CreateBuilder potentially inefficient, results in many file system checks
• Use a ChainedConfigurationSource to share sources between WebApplicationBuilder and inner host #33082 Use a ChainedConfigurationSource to share sources between WebApplicationBuilder and inner host
• Remove Configuration.AutoUpdate #33083 Remove Configuration.AutoUpdate

Project Templates

• Add empty template for Minimal Scenarios #30665 Add empty template for Minimal Scenarios
• Remove the cast from the empty web project template #33393 Remove cast from empty template
• Remove <LangVersion>preview from empty web template #33813 Remove <LangVersion>Preview</LangVersion> from empty web template
• Update ASP.NET Core C# project templates to use new minimal hosting APIs in .NET 6 #33944
• Update ASP.NET Core F# project templates to use new minimal hosting APIs in .NET 6 #34123
• Update blazorwasm-hosted templates to use minimal host #32471 Update blazorwasm-hosted templates to use minimal host

Docs

• Add getting started docs for minimal hosting #31992 Add getting started docs for minimal hosting

[terrajobst]

Seems like this should be parented under #27883?

[rafikiassumani-msft]

Closing this epic as I moved the remaining issues to .NET7 planning milestone.