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

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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.
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