IRouter.GetVirtualPath alternative in EndpointRouting

[alienwareone]

Based on this topic:
#18883

The "IRouter.RouteAsync" alternative is "DynamicRouteValueTransformer.TransformAsync".

What is the "VirtualPathData GetVirtualPath(VirtualPathContext context)" alternative for complex url generation?

For example:

public override VirtualPathData GetVirtualPath(VirtualPathContext context)
{
  var routeContext = context["context"] as new ProductListRouteContext();
  var pathSegements = new List<string>();
  if (context?.Category?.PageName != null)
  {
    pathSegments.Add(context.Category.PageName);
  }
  // Add other pathSegements based on the context/filters...
  return new new VirtualPathData(this, string.Join("/", pathSegments));
}

In my view:

Url.RouteUrl("ProductList", new { context = Model.ProductListRouteContext });

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[alienwareone]

The following issue will replace this:
#27646

[marcuslindblom]

@alienwareone Did you find a solution/workaround for this issue? I'm also moving from IRouter to endpoint routing and this feels like a deal breaker.

@rynowak maybe you have some workaround or is it back to IRouter for us trying to convert to endpoint routing?

[alienwareone]

@marcuslindblom I migrated to:

• IRouteConstraint -> replaces "IRouter.RouteAsync"
• IOutboundParameterTransformer -> replaces "IRouter.GetVirtualPath" (unfortunately no querystring support) IOutboundParameterTransformer: add support for QueryString parameters #27646

Sample:
https://github.com/alienwareone/ComplexOutboundParameterTransformerSample/blob/a52b3d8191a382cea9c35535bcf6075d0d3fc8cd/WebApplication2/ProductFiltersConstraint.cs

[marcuslindblom]

@alienwareone I tried using the IOutboundParameterTransformer to transform the link but it appends all route data as query parameters even though i return a string without a querystring.

This transformer:

public string TransformOutbound(object? value)
{
    return "hello-from-transformer";
}

Using this tag helper:

<a asp-controller="home" asp-action="index" asp-route-id="66eb5dbc-e73b-4d8f-add5-d245ebf14683">Hello, world</a>

Generates this link: hello-from-transformer?id=66eb5dbc-e73b-4d8f-add5-d245ebf14683

Also, instead of using Constraints I use Conventions to add my transformer.