Can't add a tag using system.io file, as i need it to be cast as a fileinfo object later in my code

Question

The tag to the file anode is causing errors with the directory anode, is this because they are one and the same? Also i think That the casting from the tag to a fileinfo object isn't working. Any suggestions as to how to get the fileinfo into the nodes that the user selects to populate a listview?

//see code below where attempts made to add tags
foreach (DirectoryInfo subDir in subDirs)
        {
            aNode = new TreeNode(subDir.Name, 0, 0);
            aNode.Tag = subDir;
            aNode.ImageKey = "Folder";
            aNode.ImageIndex = 0;
            aNode.SelectedImageIndex = 1;
            subSubDirs = subDir.GetDirectories();

            if (subSubDirs.Length != 0)
            {
                GetDirectories(subSubDirs, aNode);
            }

            //add files to treeview
            foreach (var file in subDir.GetFiles())
            {
                if(file.Name.Contains(".rfa"))
                {
                aNode.Nodes.Add(new TreeNode(file.Name)); 
           //cant add a tag to the file only to the directory
             aNode.Tag = file;               

                }
            }

            nodeToAddTo.Nodes.Add(aNode);
        }

Answer 1

1) In order to check the file's extension, it's a better practice to use:

file.Extension.Equals(".rfa", StringComparison.OrdinalIgnoreCase);

2) You're modifying the aNode 'Tag' property, which is probably what causing your problem, try modifying it as follows:

aNode.Nodes.Add(new TreeNode(file.Name){Tag=file});

3) IMHO, you should not keep the FileInfo/DirectoryInfo object in the 'Tag', rather use the path itself

4) If you simply want to display the directory's structure in a treeview, look at the following: https://stackoverflow.com/a/6239644/120391 [You can easily modify it to display only '.rfa' files]