c# string类型传递参数的问题

[ERROR已经存在]

我有一个类，类的作用是执行cmd命令，同时将执行结果存在于一个string里面，同时这个string的内容会实时显示到一个textbox内。
执行了下面的代码以后，发现output还是为空，经过分析，那是肯定的，虽然在this.details = details;的时候，两个string 的地址是一样，但是this.details做了修改以后，就不是同一个东西了。
求问，有什么办法可以使得this.details的变化实时的返回到details(即调用函数的output)中？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading;
using System.Diagnostics;
using System.Windows.Controls;
using System.Windows;
using System.Windows.Media;

    public class RunConsole
    {
        #region 私有变量
          private Process p;
        private Thread t;
        private object threadLock = new object();

        string filename = String.Empty;
        string arg = String.Empty;
        string details = String.Empty;

        AutoResetEvent resetEvent = new AutoResetEvent(false);
        ManualResetEvent pauseEvent = new ManualResetEvent(true);
        public AutoResetEvent thisEvent = new AutoResetEvent(false);
        #endregion

        public RunConsole(string file, string paras, ref string details)
        {
            filename = file;
            arg = paras;
            this.details = details;
        }


        public void Stop()
        {
            t.Abort();
            if (!p.HasExited) p.Kill();
        }


        public void Run()
        {
            t = new Thread(new ThreadStart(this.ExecuteCMD));
            t.Start();

            resetEvent.WaitOne();
            Thread.Sleep(1000);
            thisEvent.Set();
        }

        private void ExecuteCMD()
        {
            p = new Process();
            try
            {
                p.StartInfo = new ProcessStartInfo();
                p.StartInfo.FileName = filename;
                p.StartInfo.Arguments = arg;
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.RedirectStandardError = true;
                p.StartInfo.RedirectStandardInput = true;
                p.StartInfo.UseShellExecute = false;
                p.StartInfo.CreateNoWindow = true;
                p.Start();
                p.OutputDataReceived += new DataReceivedEventHandler(p_OutputDataReceived);
                p.ErrorDataReceived += new DataReceivedEventHandler(p_ErrorDataReceived);
                p.BeginOutputReadLine();
                p.BeginErrorReadLine();
            }
            catch
            { ;}
            finally
            {
                
                resetEvent.Set();
                t.Abort();
                t = null;
                if (!p.HasExited) p.Kill();
            }

        }

        void p_ErrorDataReceived(object sender, DataReceivedEventArgs e)
        {
            lock (threadLock)
            {
                details += e.Data + "\r\n";
            }
            //throw new NotImplementedException();
        }

        void p_OutputDataReceived(object sender, DataReceivedEventArgs e)
        {
            lock (threadLock)
            {
                details += e.Data + "\r\n";
            }
            //throw new NotImplementedException();
        }
    }

      string output = String.Empty;
      RunConsole runConsole = new RunConsole(fileName, paras, ref output);
      runConsole.Run();   

[stonespace]

string虽然是引用类型，但它的内容是固定的，这个问题应该没法解决，

[菜牛]

这个引用可不是地址，你这样是没法传出数据来的，用代理吧！