How to retrieve a generic list from session?

问题

I have a list that I put in session:

Session.Add("SessionList", mylist);

How to retrieve it back from the session?

回答1:

var list = Session["SessionList"] as List<whatevertypeYouUsed>;

if (list != null){
   // blah...
}

I prefer to use the as keyword since there is no 100% guarantee that the Session will contain the list (due to application pool refresh, website being restarted, etc). Gives you that extra bit of defence to avoid a NullReferenceException.

回答2:

Try

var myList = (List<WhateverTypeItIs>)Session["SessionList"];

回答3:

liek this...

 var list = Session["SessionList"] as List<whateveritis>;

or you can cast like this

 var List1 = (List<typespecified>)Session["SessionList"];  

回答4:

Like below

 var list  = Session["SessionList"] as List<typespecified>;

OR also you can cast like below

var list = (List<typespecified>)Session["SessionList"];

回答5:

Try this:

Var sessionlist = (List<Type of list>) Session["CustomerSessionList"];

来源：https://stackoverflow.com/questions/8194238/how-to-retrieve-a-generic-list-from-session