Produces Problem

Call ProducesProblem and ProducesValidationProblem on route groups

The ProducesProblem and ProducesValidationProblem extension methods have been updated to support their use on route groups. These methods indicate that all endpoints in a route group can return ProblemDetails or ValidationProblemDetails responses for the purposes of OpenAPI metadata.

var app = WebApplication.Create();

var todos = app.MapGroup("/todos")
    .ProducesProblem();

todos.MapGet("/", () => new Todo(1, "Create sample app", false));
todos.MapPost("/", (Todo todo) => Results.Ok(todo));

app.Run();

record Todo(int Id, string Title, boolean IsCompleted);

Problem and ValidationProblem result types support construction with IEnumerable<KeyValuePair<string, object?>> values

Prior to .NET 9, constructing Problem and ValidationProblem result types in Minimal APIs required that the errors and extensions properties be initialized with an implementation of IDictionary<string, object?>. In this release, these construction APIs support overloads that consume IEnumerable<KeyValuePair<string, object?>>.

:::code language="csharp" source="~/fundamentals/openapi/samples/9.x/ProducesProblem/Program.cs" id="snippet_2" :::

Thanks to GitHub user joegoldman2 for this contribution!