How do I open a FolderBrowserDialog at the selected folder?

Question

I have a FolderBrowserDialog, displayed with code shown below. However, it keeps opening with \'Computer\', i.e. the root of the folder tree, selected. How do I get it to

Answer 1

My solution, here

I wrote this solution based on this solution by ParkerJay86. The solution worked on Windows 8 with several paths tested. Consider that your specified rootFolder should start with DriveLetter:\ like "C:\ProgramData"

        private void browseFolder_Click(object sender, EventArgs e)
        {
            String selectedPath;
            if (ShowFBD("C:\\", "Please Select a folder", out selectedPath))
            {
                MessageBox.Show(selectedPath);
            }
        }

        public bool ShowFBD(String rootFolder, String title, out String selectedPath)
        {
            var shellType = Type.GetTypeFromProgID("Shell.Application");
            var shell = Activator.CreateInstance(shellType);
            var result = shellType.InvokeMember("BrowseForFolder", BindingFlags.InvokeMethod, null, shell, new object[] { 0, title, 0, rootFolder });
            if (result == null)
            {
                selectedPath = "";
                return false;
            }
            else
            {
                StringBuilder sb = new StringBuilder();
                while (result != null)
                {
                    var folderName = result.GetType().InvokeMember("Title", BindingFlags.GetProperty, null, result, null).ToString();
                    sb.Insert(0, String.Format("{0}\\", folderName));
                    result = result.GetType().InvokeMember("ParentFolder", BindingFlags.GetProperty, null, result, null);
                }
                selectedPath = sb.ToString();

                selectedPath = Regex.Replace(selectedPath, @"Desktop\\Computer\\.*\(\w:\)\\", rootFolder.Substring(0, 3));
                return true;
            }
        }