Error using SPRequest when the SPWeb is already disposed

Question

Is this correct way of using the SPSite and SPWeb and the SPList.

private SPList list;

pulic void getList()
{
using (SPSite site = SPContext.Current.Web.Site.WebApplication.Sites[0])
{
    using (SPWeb web = site.RootWeb)
    {
        SPListCollection lists = web.Lists;
        list = lists.TryGetList("listname");
    }
} 
}

private override void PerformAction()
{
  //retrieving items from the splist
}

I think because of this code i get an error:

Detected use of SPRequest for previously closed SPWeb object. Please close SPWeb objects when you are done with all objects obtained from them, but not before. Stack trace: at Microsoft.SharePoint.SPListItemCollection.EnsureListItemsData() ....

Can the cause be: that i retrieve list and then so to say dispose the SPWeb object as im using it in using clause, but the list instance is still there and i try to retrieve items from it? I do NOT perform any insert or update actions only retrieve.

And if it is the cause how can i work around that? The retrievement of the list should happen in different method, because i do an override of the method.

I transformed the code to this, as msdn says rootweb I shouldn't dispose.

 using (SPSite site = new SPSite(SPContext.Current.Site.WebApplication.Sites[0].Url))
{
    SPWeb web = site.RootWeb;
    SPListCollection lists = web.Lists;
    list = lists.TryGetList("listname");
}

Still have the same error in the logs

Answer 1

If you would like to work with SharePoint, first at all, you should read this post. It describes how to dispose SharePoint objects.

In the post you can find this:

public void RootWebBestPractice()
{
    // New SPSite.
    using (SPSite siteCollection = new SPSite("http://moss"))
    {
        SPWeb rootWeb1 = siteCollection.RootWeb;
        // No explicit rootWeb1 dispose required.
    }  // siteCollection automatically disposed by implementing using().
    // rootWeb1 will be Disposed by SPSite.

    // SPContext and SPControl
    SPWeb rootWeb2 = SPContext.Current.Site.RootWeb;
    // Also would apply to SPControl.GetContextSite(Context);
    // No explicit rootWeb2 dispose required because it's obtained from SPContext.Current.Site.
}

Answer 2

Just use it like this:

 SPSite currentSite = SPContext.Current.Site;
 SPList mySPList = currentSite.RootWeb.Lists.TryGetList("VoorbeeldLijst");

 if (mySPList != null)
 {
   ...
   ...
 }