//C# DES加密解密之解密方法         
public string Decrypt(string pToDecrypt, string sKey)        
{            
     DESCryptoServiceProvider des = new DESCryptoServiceProvider();            
     byte[] inputByteArray = new byte[pToDecrypt.Length / 2];            
     for (int x = 0; x < pToDecrypt.Length / 2; x++)            
     {                
        int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2),16));               inputByteArray[x] = (byte)i;            
     }            
     byte [] inputByteArraykey = new byte[sKey.Length / 2];            
     for (int x = 0; x < sKey.Length / 2; x++)            
     {                
         int i = (Convert.ToInt32(sKey.Substring(x * 2, 2), 16));                   inputByteArraykey[x] = (byte)i;            
      }       
      des.Key = (byte[])inputByteArraykey;        
      des.IV = (byte[])inputByteArraykey;      
      MemoryStream ms = new MemoryStream();            
      CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);                
      cs.Write(inputByteArray, 0, inputByteArray.Length);            
      try           
      {                
           cs.FlushFinalBlock();       
     }      
      catch (SystemException ex)      
      {           
             System.Windows.Forms.MessageBox.Show(ex.Message);         
      }  
     StringBuilder ret = new StringBuilder();      
      return System.Text.Encoding.Default.GetString(ms.ToArray());   
     }
     我自己建的一个测试数据，pToDecrypt=“D9932D9DH4021B68EC91C730291EC88C”,Skey="1472583690123456",skey为16位的数据，DES解密的密钥需要8字节的skey，我按2位合为一个字节进行测试，在catch里面就会捕捉异常，“不正确的数据”，这是什么原因呢？