c# - Parameters dictionary contains a null entry for parameter -

i having 2 view pages using same controller , model way change page layout having trouble displaying second page. error message: the parameters dictionary contains null entry parameter id of non-nullable type method system.web.mvc.actionaresult listview(int32) in usercontroller

not sure causing problem used same code first view page(working) except changing view layout.

first view

<div> <a href="/roster/listview">click here list view</a> </div>  <section id="users" data-bind="foreach: users">     <div id="nameimage">         <figure id="content">             <img width="158" height="158" alt="gravatar" data-bind="attr:{src: gravatarurl}"/>             <figcaption>                 <a title="email" id="emailicon" class="icon-envelope icon-white" data-bind="attr:{'href':'mailto:' + email()}"></a>                 <a title="profile" id="profileicon" class="icon-user icon-white"></a>             </figcaption>         </figure>         <p data-bind="text:name"></p>         </div>     </section> </section> 

list view

<div class="accordion-inner"> <div data-bind="foreach: users">     <div>         <img width="158" height="158" alt="gravatar" data-bind="attr:{src: gravatarurl}"/>         <p data-bind="text:name"></p>     </div> </div> 

controller

 public actionresult view(int id)     {         // menu cache, id         viewbag.sidebarmenu = sidemenumanager.getrootmenu(id);         viewbag.userapiurl = "/api/user/" + id.tostring();         return view();      }      public actionresult listview(int id)     {         // menu cache, id         viewbag.sidebarmenu = sidemenumanager.getrootmenu(id);         viewbag.userapiurl = "/api/user/" + id.tostring();         return view();     } } 

api controller

private userservice _userservice = new userservice();      public ienumerable<user> get(int? id)     {         if (id.hasvalue)         {             return _userservice.getusers(id.value);         }         throw new httpresponseexception(httpstatuscode.notfound);     } 

the url /roster/listview missing id value. you'll need either:

1. change url /roster/listview/123
2. change action method allow nullable integer changing type int int?. in action method need check if id parameter null or not , deal appropriately, such returning error, or ignoring id.