ASP.NET MVC - Use Reflection to find if a Controller Exists

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离开以前
离开以前 2021-02-10 04:23

I\'m having a heck of a time figuring out how to properly implement my 404 redirecting.

If I use the following

 _
Public Class BaseC         


        
3条回答
  •  醉梦人生
    2021-02-10 04:45

    I have a C# solution, I hope it helps. I plagiarized some of this code, though for the life of me, I cannot find where I got it from. If anyone know, please let me know so I can add it to my comments.

    This solution does not use reflection, but it looks at all the application errors (exceptions) and checks to see if it's a 404 error. If it is, then it just routes the current request to a different controller. Though I am not an expert in any way, I think this solution might be faster than reflection. Anyway, here's the solution and it goes into your Global.asax.cs,

        protected void Application_Error(object sender, EventArgs e)
        {
            Exception exception = Server.GetLastError();
    
            // A good location for any error logging, otherwise, do it inside of the error controller.
    
            Response.Clear();
            HttpException httpException = exception as HttpException;
            RouteData routeData = new RouteData();
            routeData.Values.Add("controller", "YourErrorController");
    
            if (httpException != null)
            {
                if (httpException.GetHttpCode() == 404)
                {
                    routeData.Values.Add("action", "YourErrorAction");
    
                    // We can pass the exception to the Action as well, something like
                    // routeData.Values.Add("error", exception);
    
                    // Clear the error, otherwise, we will always get the default error page.
                    Server.ClearError();
    
                    // Call the controller with the route
                    IController errorController = new ApplicationName.Controllers.YourErrorController();
                    errorController.Execute(new RequestContext(new HttpContextWrapper(Context), routeData));
                }
            }
        }
    

    So the controller would be,

    public class YourErrorController : Controller
    {
        public ActionResult YourErrorAction()
        {
            return View();
        }
    }
    

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