Show a document library hierarchy in a tree view

Objective:

To programmatically build a tree view that shows a specific document library.

Solution:

To achieve this goal, SharePoint offers the classes:

- SPHierarchyDataSourceControl

- SPTreeView

With SPHierarchyDataSourceControl you can build the entire hierarchy of you web. In this case we need 

to limit it to a single document library.

Build a new Web Part and override the CreateChildControls method with the following code, modifying 

the data source with your needed:

protected override void CreateChildControls()

{

           

        SPDocumentLibrary docLib = GetDocLib(SPContext.Current.Web.ServerRelativeUrl, "Shared Documents");
        //change GetDocLib with your code to get a SPDocumentLibrary object

SPHierarchyDataSourceControl myDataSource = new SPHierarchyDataSourceControl();

myDataSource.ID = "myTreeViewDataSource";

myDataSource.RootContextObject = "Web";

        myDataSource.IncludeDiscussionFolders = false;

        myDataSource.ShowDocLibChildren = true;

        myDataSource.ShowFolderChildren = true;

        myDataSource.ShowListChildren = false;

        myDataSource.ShowWebChildren = false;

        myDataSource.Web = SPContext.Current.Web;

        myDataSource.RootWebId = SPContext.Current.Web.ID.ToString();

        myDataSource.RootContextObject = null;

        myDataSource.RootListId = docLib.ID.ToString();

           

        SPTreeView myTreeView = new SPTreeView();

        myTreeView.ID = "myTreeView";

        myTreeView.DataSourceID = "myTreeViewDataSource";

        myTreeView.EnableClientScript = true;

        myTreeView.EnableViewState = true;

        myTreeView.NodeIndent = 12;

        myTreeView.NodeStyle.CssClass = "ms-navitem";

        myTreeView.NodeStyle.HorizontalPadding = 2;

        myTreeView.SelectedNodeStyle.CssClass = "ms-tvselected";

        myTreeView.ExpandDepth = 0;

        myTreeView.ExpandImageUrl = 
        SPUrlUtility.CombineUrl(SPContext.Current.Web.ServerRelativeUrl, "/_layouts/images/tvplus.gif");

        myTreeView.CollapseImageUrl =

        SPUrlUtility.CombineUrl(SPContext.Current.Web.ServerRelativeUrl, "/_layouts/images/ tvminus.gif");

        myTreeView.NoExpandImageUrl = 
       SPUrlUtility.CombineUrl(SPContext.Current.Web.ServerRelativeUrl, "/_layouts/images/ tvblank.gif");

        myTreeView.SkipLinkText = "";

        myTreeView.ShowLines = true;

        Controls.Add(myTreeView);

}