调用winrar压缩问题 ,压缩老有上层目录

调用winrar压缩问题 ,压缩老有上层目录
调用这个会压缩 Compress(string targetFileFullName, string destFolderPath)
如果targetFileFullName为c:\abc\yasuo目录
 
destFolderPath为d:\abc\backup 目录

调用后压缩则在d:\abc下生成backup.rar文件 且rar打开后会是abc目录,双击才是yasuo目录

现在想压缩成d:\abc\backup\yasuo.rar,且rar文件打开后是yasuo目录. 求救怎么修改

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.IO;

namespace Geoway.HJDMS.Service.Util
{

    public class Decompression
    {

        private string _winrarPath;
        private int _exitNum;
        public Decompression(string winrarPath)
        {
            _winrarPath = winrarPath;
        }
        private void KillWinRar()
        {
            Process[] processes = Process.GetProcesses();
            foreach (Process process in processes)
            {
                if (process.ProcessName == "WinRAR")
                {
                    process.Kill();
                }
            }
        }
        public bool Compress(string targetFileFullName, string destFolderPath)
        {
            bool Result = false;
            try
            {
                string cmd = string.Format( "A {0} {1} -r   ", destFolderPath,targetFileFullName );
                ProcessStartInfo startInfo = new ProcessStartInfo();
                startInfo.FileName = _winrarPath;
                startInfo.Arguments = cmd;
                startInfo.WindowStyle = ProcessWindowStyle.Hidden;
                startInfo.WorkingDirectory = Path.GetDirectoryName(targetFileFullName);
                Process process = new Process();
                process.StartInfo = startInfo;