ASP.NET MVC会话变量不起作用-保留为null

Question

I am trying to store an object of the type 'Person' in a session variable. The Session variable is stored like so:

    public void SelectPerson(int ID)
    {
        Person person = db.People.Where(p => p.ID == ID).FirstOrDefault();

        Session["PersonID"] = ID;
        Session["Person"] = person;
    }

I then try and use this session variable at a later date, but it is always coming back as null

Person person = (Person) Session["Person"];

I am not sure why this isn't working. Does anyone have any ideas? Thanks for your help.

Answer 1

Please check what is the value that you get from this line: Person person = db.People.Where(p => p.ID == ID).FirstOrDefault();

Try to write:

Response.Write(person);

After you tried what I've wrote here, tell me the value that it writes.