Treeview NavigateUrl absolut path sharepoint

Question

I have a treeview of files and i need to download those files from another page. So Im setting the NavigateUrl to the downloadpage but im getting the currentpage path and downloadpages path.

foreach (FileInfo file in currentDir.GetFiles())
            {
                TreeNode nodeFile = new TreeNode(file.Name, file.FullName);
                nodeFile.NavigateUrl = "_layouts/Download.aspx?file="+file.FullName;
                nodeFile.Target = "_blank";
                nodeFile.ImageUrl = "_layouts/images/DOC_SP16.gif";
                currentNode.ChildNodes.Add(nodeFile);
            }

When i click the node it's navigating to

http://localhost/_CONTROLTEMPLATES/MyLib/_layouts/Download.aspx?file=c:Somefile.txt

but what i want is the path to the root URL like this.

http://localhost/_layouts/Download.aspx?file=ownload.aspx?file=c:Somefile.txt

I don't want to move my download.aspx to that location. Anybody got a good solution for this?

Answer 1

I found the simple soulution i was looking for insted of

nodeFile.NavigateUrl = "_layouts/Download.aspx?file="+file.FullName;

I put an "/" in the beginning of the path

nodeFile.NavigateUrl = "/_layouts/Download.aspx?file="+file.FullName;

Answer 2

Your solution will only work on site collection that are on the root of a WebAppliction.

I suggest to use the SPUtility.GetServerRelativeUrlFromPrefixedUrl method to calculate the actual correct url.

If you want to target an application page at SPWeb level, use:

var theUrl =  SPUtility.GetServerRelativeUrlFromPrefixedUrl(   
    "~site/_layouts/Download.aspx?file="+file.FullName
    );

If you want to target an application page at SPSite level, use:

var theUrl =  SPUtility.GetServerRelativeUrlFromPrefixedUrl(   
    "~sitecollection/_layouts/Download.aspx?file="+file.FullName
    );

This will ensure the correctness of the url, wherever your code runs.

As a side note, you may visit the SharePoint dedicated StackExchange site