WPF 获取文件夹路径，目录路径，复制文件，选择下载文件夹/目录

 private void Border_MouseLeftButtonUp_4(object sender, MouseButtonEventArgs e)
        {
            //获取项目中文件
            string WantedPath = System.Windows.Forms.Application.StartupPath.Substring(, 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");
            }
        }