Route parameter TryParse checks does not handle handler parameters with [FromRoute] attribute where name is provided.

[mitchdenny]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Given the following example:

using Microsoft.AspNetCore.Mvc;
using System.Diagnostics.CodeAnalysis;

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/{blah}", ([FromRoute(Name = "blah")]MyRouteObject x) => "Hello World!");

app.Run();

public class MyRouteObject
{
}

... the recently added Roslyn analyzer fails to warn that MyRouteObject does not have a TryParse(...) method. This results in a runtime error when this code is run.

Expected Behavior

We should raise an analyzer warning on the handler parameter because it's a route parameter that does not implement TryParse.

Steps To Reproduce

See above.

Exceptions (if any)

At runtime we get the following exception:

InvalidOperationException: No public static bool MyRouteObject.TryParse(string, out MyRouteObject) method found for x.

.NET Version

8.0.100-alpha.1.22613.3

Anything else?

No response

[ghost]

Thanks for contacting us.

We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues.
To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.