Friday, October 28, 2011

How to change the view used by XsltListViewWebPart

So I was in a situation that I needed to change what view was being displayed on a page dynamically.
I am using the the XsltListViewWebPart to display all the values of a list to the user and depending on the user and different properties of the list items I needed to filter the view as well as assign a different XSL file.

The biggest problem I had was that the list view GUID  is created only at deploy time and I could find no other way to assign a different view.

I came across several posts that had examples of changing the view or adding a new XLVWP to the page at deploy time and

So I wanted to take this a little further and be able to dictate what view was used on the fly.  Using a QueryString of the ListID and the ListViewName I then assign the appropriate view in the OnInit event as shown below.

public partial class RecordHistory : DialogLayoutsPageBase
     protected void Page_Load(object sender, EventArgs e)
     protected override void OnInit(EventArgs e)
         string[] strLists = Request.QueryString.GetValues("ListID");
         string[] strListViewName = Request.QueryString.GetValues("ListViewName");

         if (strLists == null || strLists.Length < 1)
             throw new SPException(SPResource.GetString(Strings.MissingRequiredQueryString, "ListID"));
         SPList spList = SPControl.GetContextWeb(Context).Lists.GetList(new Guid(strLists[0]), true);
         SPView view = spList.Views[strListViewName[0]];
         this.xlvwpRecordHistory.ViewGuid = view.ID.ToString();
         this.xlvwpRecordHistory.ViewId = int.Parse(view.BaseViewID);
         this.xlvwpRecordHistory.XmlDefinition = view.GetViewXml();

As always there are many ways to do this that might be better but this worked and I found no other examples of this on the web.
Please let me know if you have a better idea