How to generate a link to an HTTP POST action with Hyprlinkr?

Question

I'm trying to use Hyprlinkr to generate URL to the HTTP Post action. My controller looks like this:

public class MyController : ApiController {
    [HttpPost]
    public void DoSomething([FromBody]SomeDto someDto) {
        ...
    }
}

with this route:

routes.MapHttpRoute(
            name: "MyRoute",
            routeTemplate: "dosomething",
            defaults: new { controller = "My", action = "DoSomething" });

I expect to get a simple URL: http://example.com/dosomething, but it does not work. I tried two methods:

1) routeLinker.GetUri(c => c.DoSomething(null)) - throws NullReferenceException

2) routeLinker.GetUri(c => c.DoSomething(new SomeDto())) - generates invalid URL: http://example.com/dosomething?someDto=Namespace.SomeDto

Update: Issue opened at github: https://github.com/ploeh/Hyprlinkr/issues/17

Answer 1

I found a workaround, loosely based on Mark's answer. The idea is to go over every route parameter and remove those that have [FromBody] attribute applied to them. This way dispatcher does not need to be modified for every new controller or action.

public class BodyParametersRemover : IRouteDispatcher {
    private readonly IRouteDispatcher _defaultDispatcher;

    public BodyParametersRemover(String routeName) {
        if (routeName == null) {
            throw new ArgumentNullException("routeName");
        }
        _defaultDispatcher = new DefaultRouteDispatcher(routeName);
    }

    public Rouple Dispatch(
        MethodCallExpression method,
        IDictionary<string, object> routeValues) {

        var routeKeysToRemove = new HashSet<string>();
        foreach (var paramName in routeValues.Keys) {
            var parameter = method
                .Method
                .GetParameters()
                .FirstOrDefault(p => p.Name == paramName);
            if (parameter != null) {
                if (IsFromBodyParameter(parameter)) {
                    routeKeysToRemove.Add(paramName);
                }
            }
        }
        foreach (var routeKeyToRemove in routeKeysToRemove) {
            routeValues.Remove(routeKeyToRemove);
        }
        return _defaultDispatcher.Dispatch(method, routeValues);
    }

    private Boolean IsFromBodyParameter(ParameterInfo parameter) {
        var attributes = parameter.CustomAttributes;
        return attributes.Any(
            ct => ct.AttributeType == typeof (FromBodyAttribute));
    }
}