Web API Model Binder for Route Data

RouteDataModelBinder.cs

using System;
using System.Web.Http.Controllers;
using System.Web.Http.ModelBinding;

namespace Example
{
    public class RouteDataModelBinder : IModelBinder
    {
        #region IModelBinder Members

        public bool BindModel(HttpActionContext actionContext, ModelBindingContext bindingContext)
        {
            object model;

            if (!actionContext.RequestContext.RouteData.Values.TryGetValue(bindingContext.ModelName, out model))
            {
                bindingContext.ModelState.AddModelError(bindingContext.ModelName, $"No route data named '{bindingContext.ModelName}'.");
                return false;
            }

            if (!bindingContext.ModelType.IsAssignableFrom(model.GetType()))
            {
                try
                {
                    model = Convert.ChangeType(model, bindingContext.ModelType);
                }
                catch
                {
                    bindingContext.ModelState.AddModelError(bindingContext.ModelName, $"Route data cannot be converted to type '{bindingContext.ModelType.FullName}'.");
                    return false;
                }
            }

            bindingContext.Model = model;
            return true;
        }

        #endregion
    }
    
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Parameter, Inherited = true, AllowMultiple = false)]
    public class RouteDataAttribute : ModelBinderAttribute
    {
        public RouteDataAttribute()
        {
            this.BinderType = typeof(RouteDataModelBinder);
        }
    }
}