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.NET Forum / ASP.NET / General / May 2008Using Session variables without casting them to a new object
I find it a little hard sometimes to cast a Session variable to a different object, do what I need to do to it and then send it back to the Session. Is there a way to do this without taking the variable out of the Session first? I have 15-20 methods on my page codebehind that uses this Session variable, so I would have to cast/modify/send 15-20 times. Can I do something like this instead? (DataSet)Session["Store"].Tables["Contract"].Columns.Add(...); Or does it actually have to be cast outside of Session in order to work? Just expose this as you wish behind a wrapper. Basically something such as : http://weblogs.asp.net/cstewart/archive/2008/01/09/strongly-typed-session-in-asp -net.aspx According ot the http://msdn.microsoft.com/en-us/library/aa478952.aspx even the SQL Session provider serializes at the end of the resuest. So you shouldn't have to "extract/store" the object to/from the session variable (anyway if this is behind a wrapper your application won't care care about this). -- Patrice "Andy B" <a_borka@sbcglobal.net> a écrit dans le message de groupe de discussion : Ok1uS5OvIHA.2292@TK2MSFTNGP05.phx.gbl... > I find it a little hard sometimes to cast a Session variable to a > different object, do what I need to do to it and then send it back to the [quoted text clipped - 6 lines] > > Or does it actually have to be cast outside of Session in order to work? >I find it a little hard sometimes to cast a Session variable to a different >object, do what I need to do to it and then send it back to the Session. Is [quoted text clipped - 6 lines] > > Or does it actually have to be cast outside of Session in order to work? Why not create a variable. Ensure variable is correct type. Init it from session. Then you should never have to cast again during the current execution of the page. LS What do you mean? >>I find it a little hard sometimes to cast a Session variable to a >>different object, do what I need to do to it and then send it back to the [quoted text clipped - 12 lines] > > LS > What do you mean? > [quoted text clipped - 14 lines] >> >> LS Create a page level variable of type DataSet. Then on load or whenever you need it. If you use a property you can do something like: DataSet myVariable; In the property get: if (myVariable ==null) { myVariable=Session["Store"]' } return myVariable; You then have a varible to use when you require it access it thru the property and you will either get what has been loaded or will load it and then present it to you. LS > Create a page level variable of type DataSet. Then on load or whenever > you need it. If you use a property you can do something like: [quoted text clipped - 7 lines] > } > return myVariable; Surely that will throw an exception because you're trying to populate a DataSet variable with an object datatype...  SignatureMark Rae ASP.NET MVP http://www.markrae.net >> Create a page level variable of type DataSet. Then on load or whenever >> you need it. If you use a property you can do something like: [quoted text clipped - 10 lines] > Surely that will throw an exception because you're trying to populate a > DataSet variable with an object datatype... sorry myVariable=(DataSet)Session["Store"]' >>> if (myVariable ==null) >>> { [quoted text clipped - 8 lines] > > myVariable=(DataSet)Session["Store"]' Yeah, but that's precisely what the OP is trying to avoid, at least, based on the thread title... Not possible, IMO... SignatureMark Rae ASP.NET MVP http://www.markrae.net Here is how i do staff hope it will help you on your quest to perfect .NET application :) 1. Create new class clsBrowser for example like this public class clsBrowser { public int _iUserId; public string _sFirstName; public string _sLastName; public clsShoppingCart _shoppingCart = null; } 2. Create new class clsStandardPage : System.Web.UI.Page public class clsStandardPage : System.Web.UI.Page { protected clsBrowserSession _objBs; protected override void OnPreInit(EventArgs e) { Response.CacheControl = "no-cache"; Response.Expires = -1; _objBs = (clsBrowserSession)Session["BrowserSession"]; if (_objBs == null) { _objBs = new clsBrowserSession(); Session["BrowserSession"] = _objBs; } base.OnInit(e); } } 3. Modify web.config a little. <pages pageBaseType="clsStandardPage"> ........done..... Now all your pages will be derived from clsStandardPage. All your page's code will have access to _objBs variable. no code like that string sFirstName = (string)Session["FirstName"]; now it's string sFirstName = _objBs._sFirstName; Hope you got an idea... 1. It actually reduces a mess if you have a lot of Session variables. 2. No mispells anymore when working with Session object. 3. Code is type safe. 4. Code is faster since everytime you do Session[".."] it's a look up in hashtable. Plus boxing/unboxint of value types.... George. Note that you need to have parentheses to "limit" so that you have the correct type at hand (note ( - and - ) around the cast ((DataSet)Session["Store"]).Tables["Contract"].Columns.Add(...); SignatureTeemu Keiski AspInsider, ASP.NET MVP http://blogs.aspadvice.com/joteke http://teemukeiski.net >I find it a little hard sometimes to cast a Session variable to a different >object, do what I need to do to it and then send it back to the Session. Is [quoted text clipped - 6 lines] > > Or does it actually have to be cast outside of Session in order to work? Andy B has brought this to us : > I find it a little hard sometimes to cast a Session variable to a different > object, do what I need to do to it and then send it back to the Session. Is [quoted text clipped - 6 lines] > > Or does it actually have to be cast outside of Session in order to work? Note: you don't have to "put it back in the session": If you do DataSet myDataSet = (Dataset)Sesion["Store"]; then myDataSet will point to the *same* DataSet on the heap as Session["Store"]. So any changes done through myDataSet will also be visible to Session["Store"], as they point to the same object. Hans Kesting I found out that I can also do something like this: DataSet DataSet = new DataSet(); Session["DataSet"]=Dataset; and then later I can do this: ((DataSet)Session["DataSet"]).[whatever you normally do to datasets]; Works just fine and sticks around through Wizard.ActiveStepIndex changes and page reloads... > Andy B has brought this to us : >> I find it a little hard sometimes to cast a Session variable to a [quoted text clipped - 19 lines] > > Hans Kesting Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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