c# - The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32'

Question

I am building My first MVC application, I have a table in database containing 3 columns:

1. Id → primary key
2. Username
3. password

When I am clicking on edit link edit a record, its throwing following exception:

The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Edit(Int32)' in 'MvcApplication1.Controllers.UserController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. Parameter name: parameters

Here is my edit code:

public ActionResult Edit(int id, User collection)
{
    UserDBMLDataContext db = new UserDBMLDataContext();
    var q = from abc in db.User_Login_Details
            where abc.Id == id
            select abc;

    IList lst = q.ToList();

    User_Login_Details userLook = (User_Login_Details)lst[0];

    userLook.Username = collection.UserName;
    userLook.Password = collection.Password;
    db.SubmitChanges();
    return RedirectToAction("Index");                  
}

Answer 1

You are expecting an id parameter in your URL but you aren't supplying one. Such as:

http://yoursite.com/controller/edit/12
                                    ^^ missing