c#中， List序列化和反序列化的问题， 有一些细节不是很清楚， 请大神解答

[coder1988]

我现在在做一个把记录加密存储进.dat文件的模块， 每条记录大概是时间+操作的格式， 采用的加密并存放文件的代码来自http://blog.csdn.net/paiooo/article/details/7017211， 现在我要加密的对象里面有一个list就是用于存放时间的字符串的， 整个代码大致如下

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Security.Cryptography;

namespace Console_CS
{
    class Program
    {
        public static void Main()
        {
            CGameGlobal g = new CGameGlobal();

            //读取记录， 第一次读取文件时需要暂时注释掉， 因为还没有生成记录文件
            g = CObjFileStore.LoadObj("Global.dat") as CGameGlobal;

            //只在第一次执行时添加记录， 执行第一遍以后就应该注释起来
            g.lstSdcsData.Clear();
            for (int i = 0; i < 5000; i++)
            {
                string strNow = DateTime.Now.ToString();
                g.lstSdcsData.Add(strNow);
            }

            //输出记录
            for (int i = 0; i < 5000; i++)
            {
                Console.WriteLine(g.lstSdcsData[i] + "\t" + i);
            }
            //保存记录
            CObjFileStore.SaveObj("Global.dat", g); 
        }
    }


}

/// <summary>
/// 记录类
/// </summary>
[System.Serializable]
public class CGameGlobal
{
    public List<string> lstSdcsData = new List<string>();
}   


/// <summary>
/// 
/// </summary>
class CObjFileStore
{
    const string keyStr = "yourkey";  //加密的KEY字符，用MD5码生成128位KEY密钥  
    const string ivStr = "youriv";    //加密的IV字符，用MD5码生成128位IV密钥  

    /// <summary>  
    /// 将对象保存为文件  
    /// </summary>  
    /// <param name="uFilename">文件名及地址</param>  
    /// <param name="uTarget">保存对象，需[Serializable]</param>  
    static public void SaveObj(string uFilename, object uTarget)
    {
        IFormatter formatter = new BinaryFormatter();
        MemoryStream mStream = new MemoryStream();
        formatter.Serialize(mStream, uTarget);
        Rijndael rijn = Rijndael.Create();
        MD5 md5 = MD5.Create();
        byte[] Key = md5.ComputeHash(Encoding.ASCII.GetBytes(keyStr));
        byte[] IV = md5.ComputeHash(Encoding.ASCII.GetBytes(ivStr));
        FileStream fStream = new FileStream(uFilename, FileMode.Create, FileAccess.Write,
            FileShare.None);
        CryptoStream cStream = new CryptoStream(fStream, rijn.CreateEncryptor(Key, IV),
            CryptoStreamMode.Write);
        StreamWriter sWriter = new StreamWriter(cStream, Encoding.ASCII);
        char[] data = Encoding.ASCII.GetChars(mStream.ToArray());
        sWriter.Write(data);
        sWriter.Flush();
        sWriter.Close();
        cStream.Close();
        fStream.Close();
        mStream.Close();
    }

    /// <summary>  
    /// 从文件读取对象  
    /// </summary>  
    /// <param name="uFilename">文件名及地址</param>  
    /// <returns>反序列化后的对象，类型为object</returns>  
    static public object LoadObj(string uFilename)
    {
        IFormatter formatter = new BinaryFormatter();
        Rijndael rijn = Rijndael.Create();
        MD5 md5 = MD5.Create();
        byte[] Key = md5.ComputeHash(Encoding.ASCII.GetBytes(keyStr));
        byte[] IV = md5.ComputeHash(Encoding.ASCII.GetBytes(ivStr));
        FileStream fStream = new FileStream(uFilename, FileMode.Open, FileAccess.Read,
            FileShare.Read);
        CryptoStream cStream = new CryptoStream(fStream, rijn.CreateDecryptor(Key, IV),
            CryptoStreamMode.Read);
        StreamReader sReader = new StreamReader(cStream);
        string ftxt = sReader.ReadToEnd();
        byte[] bytes = Encoding.ASCII.GetBytes(ftxt);
        MemoryStream mStream = new MemoryStream(bytes);
        object result = formatter.Deserialize(mStream);
        sReader.Close();
        cStream.Close();
        fStream.Close();
        mStream.Close();
        return result;
    }
}

当序列化的时候， 序列化进去5000个元素(list添加5000个字符串)， 反序列化的时候， 只能序列化到下标为4629的元素， 以后的元素就提示超出下标范围， 当序列化进去10000个元素的时候， 直接提示
"未处理的异常: System.Runtime.Serialization.SerializationException: 在链接地址信
息中引用了 ID 为 4 的对象，但该对象并不存在。"
如果只序列化4629个或者少于4629个元素， 就正常， 请大神指出只能序列化4000多个元素的瓶颈在哪， 另外在unity3d的c#脚本中， 同样的代码只能序列化大概200来个元素， 超过的也是类似的提示， 一直没找到原因， 期待大神的解答

[真相重于对错]

try不要按char操作，而要按byte操作

[soaringbird]

这样改：

//StreamWriter sWriter = new StreamWriter(cStream, Encoding.ASCII);
 //char[] data = Encoding.ASCII.GetChars(mStream.ToArray());
//sWriter.Write(data);
 mStream.Position = 0;
 mStream.CopyTo(cStream);
 //sWriter.Flush();
  //sWriter.Close();

 CryptoStream cStream = new CryptoStream(fStream, rijn.CreateDecryptor(Key, IV),
                CryptoStreamMode.Read);
//StreamReader sReader = new StreamReader(cStream);
           
  //string ftxt = sReader.ReadToEnd();
//byte[] bytes = Encoding.ASCII.GetBytes(ftxt);
 //MemoryStream mStream = new MemoryStream(bytes);
 MemoryStream mStream = new MemoryStream();
 cStream.CopyTo(mStream);
 mStream.Position = 0;
object result = formatter.Deserialize(mStream);
//sReader.Close();

[coder1988]

谢谢两位的帮助