Url.Route method throwing exception RSS

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  raghuramn

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  Re: Url.Route method throwing exception

  Apr 05, 2012 09:07 PM|LINK

  I think you are not setting up the controller context property. Can you share your test ?

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  Noel12345

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  Re: Url.Route method throwing exception

  Apr 05, 2012 09:20 PM|LINK

  Here it is

  [Test]
  public void T1()
  {
  	ContactManager.Controllers.ContactsController contactsController = new ContactsController();
  	var contact = new Contact();
  	contact.Id = 1;
  	contact.Name = "N1";
  	contact.Phone = "123";
  	contact.Email = "dd@f";
  
          var result = contactsController.PostContact(contact);
  }

  
  
  

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  raghuramn

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  Re: Url.Route method throwing exception

  Apr 05, 2012 09:39 PM|LINK

  You haven't set the controller context on your controller and hence the NullReferenceException. webapi initializes the ControllerContext property on your controller with the right value (request, controllerdescriptor and HttpConfiguration). If you are trying to test that then you need to set the context yourself.

  may be something like

  contactsController.ControllerContext = new HttpControllerContext(new HttpConfiguration(), new HttpRouteData(new HttpRoute("DummyRoute")), new HttpRequestMessage("http://localhost/api/contacts/1"));

  
  
  

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  Noel12345

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  Re: Url.Route method throwing exception

  Apr 05, 2012 10:01 PM|LINK

  raghuramn,

  I have add that  as follows:

  var _controllerContext = new HttpControllerContext(new HttpConfiguration(),
  				new HttpRouteData(new HttpRoute("DummyRoute")), new HttpRequestMessage(HttpMethod.Post,  "http://localhost/api/contacts/1"));
  			contactsController.ControllerContext = _controllerContext;

  And am now getting another exception from the same line - 

  Value cannot be null.
  Parameter name: name

  Any ideas?

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  raghuramn

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  Microsoft

  Re: Url.Route method throwing exception

  Apr 05, 2012 11:19 PM|LINK

  You haven't setup your configuration. You need to setup the configuration object to mirror what you are doing in your app. something like

  HttpConfiguration config = new HttpConfiguration();
              config.Routes.MapHttpRoute("Default", "api/{controller}/{action}");
  
              var _controllerContext = new HttpControllerContext(config,
                                  new HttpRouteData(new HttpRoute("Default")), new HttpRequestMessage(HttpMethod.Post, "http://localhost/api/contacts/1"));

  Also, the first parameter for the for Url.Route is the name of the route not a uri.

  
  
  

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  imran_ku07

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  Re: Url.Route method throwing exception

  Apr 06, 2012 03:45 AM|LINK

  Noel12345

  And this work. Dont know how, if anyone can explain?

  Passing name paramter with null or empty in Url.Route method causes the same effect as you call this overload of RouteCollection.GetVirtualPath(which internally does not care name paramter if it is null or empty, and uses another overload RouteCollection.GetVirtualPath).

  Note: Web host abstract the usage of RouteCollection class using HttpRouteCollection class. Although, the self host does not use RouteCollection class but the behaviour is same(AFAIK).  See this for detail.

  "And whoever is removed away from the Fire and admitted to Paradise, he indeed is successful." (The Holy Quran)
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  • Edited by imran_ku07 on Apr 06, 2012 03:49 AM
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  Noel12345

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  Re: Url.Route method throwing exception

  Apr 06, 2012 11:40 AM|LINK

  I have done the following:

  var _config = new HttpConfiguration();
  _config.Routes.MapHttpRoute("DefaultApi", "api/{controller}/{id}");
  
  var _controllerContext = new HttpControllerContext(_config,
     new HttpRouteData(new HttpRoute("DefaultApi")),
     new HttpRequestMessage(HttpMethod.Post, "http://localhost/api/contacts"));
  
  contactsController.ControllerContext = _controllerContext;

  
  Which I believe complies with my application set up:

  routes.MapHttpRoute(
  	name: "DefaultApi",
  	routeTemplate: "api/{controller}/{id}",
  	defaults: new { id = RouteParameter.Optional }
  );

  However I am still getting the same error:

  Value cannot be null.
  Parameter name: name

  What am I doing wrong? I have tried to find examples of testing controllers on web but cant find any

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  imran_ku07

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  Re: Url.Route method throwing exception

  Apr 06, 2012 12:10 PM|LINK

  Noel12345

  <div class="comment-left-col">

  8 Posts

  <input id="quote-createdby" value="Noel12345" type="hidden" /></div> <div class="comment-right-col">

  Re: Url.Route method throwing exception

  4/6/2012 11:40:10 AM

  <div id="reference-post-content" class="reply-comment">

  I have done the following:

  var _config = new HttpConfiguration();
  _config.Routes.MapHttpRoute("DefaultApi", "api/{controller}/{id}");
  
  var _controllerContext = new HttpControllerContext(_config,
     new HttpRouteData(new HttpRoute("DefaultApi")),
     new HttpRequestMessage(HttpMethod.Post, "http://localhost/api/contacts"));
  
  contactsController.ControllerContext = _controllerContext;

  
  Which I believe complies with my application set up:

  routes.MapHttpRoute(
          name: "DefaultApi",
          routeTemplate: "api/{controller}/{id}",
          defaults: new { id = RouteParameter.Optional }
  );

  However I am still getting the same error:

  Value cannot be null.
  Parameter name: name

  </div> </div>

  This may be bug in self host or null value in name paramter is not allowed in self host case. See the diffrence(from source),

  web host case,

    if (string.IsNullOrEmpty(name))
          {
              return this.GetVirtualPath(requestContext, values);
          }
  

  and self host case,

   if (name == null)
              {
                  throw Error......
              }

  "And whoever is removed away from the Fire and admitted to Paradise, he indeed is successful." (The Holy Quran)
  Excellent Windows VPS Hosting
  Imran Baloch MVP, MVB, MCP, MCTS, MCPD
  • Edited by imran_ku07 on Apr 06, 2012 12:10 PM
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  Noel12345

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  Re: Url.Route method throwing exception

  Apr 06, 2012 01:12 PM|LINK

  imran_ku07,

  I can see where you are getting the if(name == null) .. -  System.Web.Http.HttpRouteCollection.GetVirtualPath

  I dont understand where the if (string.IsNullOrEmpty(name)) ... is getting called. Can you explain please?

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  imran_ku07

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  Re: Url.Route method throwing exception

  Apr 06, 2012 01:24 PM|LINK

  Noel12345

  I dont understand where the if (string.IsNullOrEmpty(name)) ... is getting called. Can you explain please?

  I think you have not read this. It is in System.Web.Routing.RouteCollection.

  "And whoever is removed away from the Fire and admitted to Paradise, he indeed is successful." (The Holy Quran)
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