Clone of Session Object

Question

Hi,

i have a class. I am using the list<myclass> and saving the list to the session.

When i am retrieving the data from the session and modifies it , it modifies the session object value also. I need a fresh list<myclass> each time i retrieve data from session. Here is my code

            

 List<myclass> lstmyclass = new List<myclass>();
            lstmyclass = (List<myclass>)Session["Listlstmyclass "];

Thanks in Advance.

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Rohan Tomar

Answer 1

If you modify something stored in session state, then the session changes.  If you want to modify the list after getting it from session, then you should duplicate the list from session to a new list, cloning individual objects (myclass) within the list.

 

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Mike

Answer 2

Yes i want to modify the list after getting it from session. What do you mean by "duplicate the list from session to a new list". Can you provide me some code?

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Rohan Tomar

Answer 3

Like this:

 

List<myclass> lstmyclass = new List<myclass>();
foreach (myclass mc in (List<myclass>)Session["Listlstmyclass "])
 lstmyclass.Add(mc);

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Mike

Answer 4

Thanks Family Tree Mike.

it didn't work for me. If i am modifying lstmyclass, next time  i get the modified data from session.

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Rohan Tomar

Answer 5

This list that you storing in Session, you need store then between the pages? If not, you can use ViewState instead Sessions.

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Web Developer

Answer 6

No i don't need to store that in between the pages. i am using that in a class.

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Rohan Tomar

Answer 7

If you do not want to modify session, you can retrive your value form session as a list, and copy it into a new list.

        Session["list"] = new List<string>() { "a", "b" };
        List<string> list = (List<string>)Session["list"];
        List<string> newList = new List<string>(list);
        newList[0] = "test";

Note if you see value from Session it will keep a and b as values.

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Web Developer

Answer 8

Thanks for the reply Norkk. I just tested your code and it Does not work. Session value is modifying when i am modifying newlist.

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Rohan Tomar

Answer 9

Are you modifying the list, or an item in the list?  If the latter, and you do not want the session to reflect that, then in the code I gave, you need to make a copy of the "myclass" object.  If you have a copy constructor, you would use:

 

List<myclass> lstmyclass = new List<myclass>();
foreach (myclass mc in (List<myclass>)Session["Listlstmyclass "])
    lstmyclass.Add(new myclass(mc));

 

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Mike

Answer 10

Awesome !!!!... Thanks Family Free Mike....

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Rohan Tomar