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string plaintext = "Ã÷ÎÄ";
byte[] srcBuffer = System.Text.Encoding.UTF8.GetBytes(plaintext);
HashAlgorithm hash = HashAlgorithm.Create("SHA1"); //½«²ÎÊý»»³É“MD5”£¬ÔòÖ´ÐÐ MD5 ¼ÓÃÜ¡£²»Çø·Ö´óСд¡£
byte[] destBuffer = hash.ComputeHash(srcBuffer);
string hashedText = BitConverter.ToString(destBuffer).Replace("-", "");
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Õâ¸öÀ࣬ÆäÃû³Æ¿Õ¼äÊÇ System.Security.Cryptography
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ºÍ ComputeHash
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Ò²¿ÉÒÔÓà SHA1Managed
ºÍ SHA1CryptoServiceProvider
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using System.Collections;  
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class Person
    {
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using System;
//¡­ ¡­
//¡­ ¡­
//¡­ ¡­

string sBeepType = s.Replace(sKey,"");
#if NET20
int.TryParse(sBeepType,out beepType); //ÔÚ.net 2.0ÖвÅÓеķ½·¨
#endif
#if ......

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//Socket»ù±¾±à³Ì
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using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
Thread mythread ;
Socket socket;
// ÇåÀíËùÓÐÕýÔÚʹÓõÄ×ÊÔ´¡£
protected override void Dispose( bool disposing )
{
try
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