/// <summary>
        /// 下载/复制
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Border_MouseLeftButtonUp_4(object sender, MouseButtonEventArgs e)
        {
            //获取的文件地址
            var path = this.txtbox1.Text;
            string WantedPath = System.Windows.Forms.Application.StartupPath.Substring(0, System.Windows.Forms.Application.StartupPath.LastIndexOf(@"\"));
            string path2 = System.IO.Path.GetDirectoryName(WantedPath);
            //相对项目路径
            path2 = path2 + @"\Excel\任务分配管理Excel文件.xls";
            //将选择的文件复制的地址
            File.Copy(path, path2, true);
            MessageBox.Show(@"已下载到：..\Excel\任务分配管理Excel文件.xls");
        }