MVC The parameters dictionary contains a null entry for parameter k of non-nullable type System Int32

Question

I am new to MVC  In My Application   I m Retrieving the Data from Mydatabase  but when I run my Application it show Error Like This this is my url   http   localhost 7317 Employee DetailsData 4      Exception Details  System ArgumentException  The parameters dictionary contains a null entry for parameter  k  of non-nullable type  System Int32  for method  System Web Mvc ActionResult DetailsData Int32   in  MVCViewDemo Controllers EmployeeController   An optional parameter must be a reference type  a nullable type  or be declared as an optional parameter  Parameter name  parameters   this is my web config file code   lt connectionStrings gt     lt add name  EmployeeContext  connectionString  Server   Database mytry integrated security true  ProviderName System Data SqlClient   gt   lt  connectionStrings gt    this is my Employee Model Class Employee cs    Table  emp          to map tablename with our class name       public class Employee               public int EmpId   get  set            public string Name   get  set            public string Gender   get  set            public string City   get  set             My EmployeeContext cs Model class   public class EmployeeContext DbContext               public DbSet lt Employee gt  Employees   get  set            my EmployeeController cs   public ActionResult DetailsData int k                         EmployeeContext Ec   new EmployeeContext                Employee emp   Ec Employees Single X   gt  X EmpId    k                          return View emp               and my view    lt h2 gt DetailsData lt  h2 gt   Model Name lt br   gt   Model City lt br   gt   Model Gender lt br   gt   Model EmpId

User · Answer

I am also new to MVC and I received the same error and found that it is not passing proper routeValues in the Index view or whatever view is present to view the all data.

It was as below

<td>
            @Html.ActionLink("Edit", "Edit", new { /* id=item.PrimaryKey */ }) |
            @Html.ActionLink("Details", "Details", new { /* id=item.PrimaryKey */ }) |
            @Html.ActionLink("Delete", "Delete", new { /* id=item.PrimaryKey */ })
        </td>

I changed it to the as show below and started to work properly.

<td>
            @Html.ActionLink("Edit", "Edit", new { EmployeeID=item.EmployeeID }) |
            @Html.ActionLink("Details", "Details", new { /* id=item.PrimaryKey */ }) |
            @Html.ActionLink("Delete", "Delete", new { /* id=item.PrimaryKey */ })
        </td>

Basically this error can also come because of improper navigation also.

User · Answer

I faced this error becouse I sent the Query string with wrong format  http   localhost 56110 user updateuserinfo Id 55 Name Basheer amp Phone  111  20111-1111 ------------------------------------------ ----   ----------- ---    --------------------------------------------must be  amp       so make sure your Query String or passed parameter in the right format

User · Answer

It appears that you are using the default route which is defined as this   routes MapRoute      name   Default       url    controller   action   id        defaults  new   controller    Home   action    Index   id   UrlParameter Optional        The key part of that route is the  id  piece  If you look at your action method  your parameter is k instead of id  You need to change your action method to this so that it matches the route parameter      change int k to int id public ActionResult DetailsData int id    If you wanted to leave your parameter as k  then you would change the URL to be   http   localhost 7317 Employee DetailsData k 4   You also appear to have a problem with your connection string  In your web config  you need to change your connection string to this  provided by haim770 in another answer that he deleted     lt connectionStrings gt     lt add name  EmployeeContext         connectionString  Server   Database mytry integrated security True          providerName  System Data SqlClient    gt   lt  connectionStrings gt

User · Answer

Also make sure the value is not too large or too small for int like in my case

User · Answer

It seems that your action needs k but ModelBinder can not find it  from form  or request or view data or      Change your action to this   public ActionResult DetailsData int  k                 EmployeeContext Ec   new EmployeeContext            if  k    null                       Employee emp   Ec Employees Single X   gt  X EmpId    k Value               return View emp                     return View

[c#] MVC : The parameters dictionary contains a null entry for parameter 'k' of non-nullable type 'System.Int32'

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