打开选取文件或目录对话框，获取文件路径

    ////////选取目录
string debugPath = null;
            // 选取目录
            FolderBrowserDialog fbd = new FolderBrowserDialog();
            fbd.ShowDialog();
            debugPath = fbd.SelectedPath;   



/////////选取文件
 OpenFileDialog ofd = new OpenFileDialog();
            ofd.ShowDialog();
          string  xmlPath = ofd.FileName;    //路径
            string fileName = Path.GetFileName(xmlPath);//文件名
            //  MessageBox.Show(fileName);