my asp.net mvc 2.0 application fails with error "No parameterless constructor defined for this objec
- by loviji
Hello, i'm new in asp.net mvc 2.
I'm trying to list all data from one table(ms sql server table). as ORM I use Entity Framework. now, I'm tried to write something to do this:
Model:
private uqsEntities _uqsEntity;
public permissionRepository(uqsEntities uqsEntity)
{
_uqsEntity = uqsEntity;
}
public IEnumerable<userPermissions> getAllData()
{
return _uqsEntity.userPermissions;
}
controller:
private DataManager _dataManager;
public ManagePermissionsController(DataManager datamanager)
{
_dataManager = datamanager;
}
public ActionResult Index()
{
return RedirectToAction("List");
}
[AcceptVerbs(HttpVerbs.Get)]
public ActionResult List()
{
return List(null);
}
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult List(int? userID)
{
return View(_dataManager.Permission.getAllData().ToList());
}
Route:
routes.MapRoute(
"ManagePerm", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "ManagePermissions", action = "Index"},
new string[] { "uqs.Controllers" } // Parameter defaults
);
and View automatically generated by Visual Studio(in action mouse right-click).
when I run app. , my app. fails.
No parameterless constructor defined for this object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.MissingMethodException: No parameterless constructor defined for this object.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[MissingMethodException: No
parameterless constructor defined for
this object.]
System.RuntimeTypeHandle.CreateInstance(RuntimeType
type, Boolean publicOnly, Boolean
noCheck, Boolean& canBeCached,
RuntimeMethodHandle& ctor, Boolean&
bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean
publicOnly, Boolean fillCache) +86
System.RuntimeType.CreateInstanceImpl(Boolean
publicOnly, Boolean
skipVisibilityChecks, Boolean
fillCache) +230
System.Activator.CreateInstance(Type
type, Boolean nonPublic) +67
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext
requestContext, Type controllerType)
+80
[InvalidOperationException: An error
occurred when trying to create a
controller of type
'uqs.Controllers.ManagePermissionsController'.
Make sure that the controller has a
parameterless public constructor.]
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext
requestContext, Type controllerType)
+190 System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext
requestContext, String controllerName)
+68 System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase
httpContext, IController& controller,
IControllerFactory& factory) +118
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase
httpContext, AsyncCallback callback,
Object state) +46
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext
httpContext, AsyncCallback callback,
Object state) +63
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext
context, AsyncCallback cb, Object
extraData) +13
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+8679186 System.Web.HttpApplication.ExecuteStep(IExecutionStep
step, Boolean& completedSynchronously)
+155
please, somebody, help me to catch problem.
