private void Border_MouseLeftButtonUp_4(object sender, MouseButtonEventArgs e)        {            //获取项目中文件            string WantedPath = System.Windows.Forms.Application.StartupPath.Substring(0, System.Windows.Forms.Application.StartupPath.LastIndexOf(@"\"));            string path2 = System.IO.Path.GetDirectoryName(WantedPath);            path2 = path2 + @"\Excel\任务分配管理Excel文件.xls";            //用户选择目录            System.Windows.Forms.FolderBrowserDialog fbd = new System.Windows.Forms.FolderBrowserDialog();            fbd.ShowDialog();            var s = fbd.SelectedPath;            if (fbd.SelectedPath != string.Empty)            {                File.Copy(path2, fbd.SelectedPath + "\\任务分配管理Excel文件.xls", true);                MessageBox.Show("下载完毕");            }        }