年轻活力 - 博客园

2007年9月12日

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace statckt
{
    class trycalss
    {
        private int a;
        private int A
        {
            set { a = value; }

        }
        public void tryM(int x)
        {
            try
            {
                for (int i = 0; i < x; i++)
                {
                    A = 1 + 1;

                }
            }
            catch (Exception ex)
            {
             Console.Write(ex.ToString());
            }
        }
        public void M(int x)
        {

                for (int i = 0; i < x; i++)
                {
                    A= 1 + 1;

                }
        }
    }

    class Test
    {


           static void Main()
           {

               trycalss t = new trycalss();

               DateTime dt = DateTime.Now;
               DateTime dt1 = DateTime.Now;
               TimeSpan ts = new TimeSpan();

               try
               {
                   int a =Convert.ToInt32(Console.ReadLine());
                   t.tryM(a);
                    ts = DateTime.Now - dt;
                   Console.WriteLine(ts.ToString());
                   dt = DateTime.Now;
                   t.M(1000000000);
                   ts = DateTime.Now - dt;
                   Console.WriteLine(ts.ToString());

               }
               catch(Exception ex)
               {
                   Console.Write(ex.ToString());
               }
               ts = DateTime.Now - dt1;
               Console.WriteLine(ts.ToString());
               dt = DateTime.Now;
               t.tryM(1000000000);
               ts = DateTime.Now - dt;
               Console.WriteLine(ts.ToString());
               dt = DateTime.Now;
               t.M(1000000000);
               ts = DateTime.Now - dt;
               Console.WriteLine(ts.ToString());
               dt = DateTime.Now;
               t.tryM(2000000000);
               ts = DateTime.Now - dt;
               Console.WriteLine(ts.ToString());
               dt = DateTime.Now;
               t.M(2000000000);
               ts = DateTime.Now - dt;
               Console.WriteLine(ts.ToString());
               Console.Read();
           }
    }

}

debug：进行相同的计算，加入Try {}catch{}，会比没加的方法慢一倍右左;
Release: 进行相同的计算，加入Try {}catch{}，会比没加的方法更快;

posted @ 2007-09-12 11:20 年轻活力阅读(97) 评论(2) 编辑

2007年8月3日

SHA1、MD5 、DES的加密解密

MSDN 加网上参考结合版，因为项目需求用到DES加密

using System;
using System.IO;
using System.Data;
using System.Text;
using System.Diagnostics;
using System.Security;
using System.Security.Cryptography;

/// <summary>
/// statics 的摘要说明
/// </summary>
public class statics
{
    public statics()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    public static byte[] Gytes(string txt)  //转换字节
    {
        UTF8Encoding utf = new UTF8Encoding();
        byte[] bytes = utf.GetBytes(txt);
        return bytes;
    }
    public static string Gpass(byte[] bt)//转换字符串
    {
        StringBuilder sb = new StringBuilder();
        foreach (int p in bt)
        {
            sb.Append(Convert.ToString(p, 16).PadLeft(2, '0'));
        }
        return sb.ToString();
    }
    public static string Gutf8(byte[] bt)
    {
        UTF8Encoding utf = new UTF8Encoding();
        return utf.GetString(bt).ToString();
    }
    public static byte[] Gbase(string bs)
    {
        return Convert.FromBase64String(bs);
    }
    public static string Sha1EN(string txt) //sha1散列
    {
        try
        {
            SHA1 s = new SHA1CryptoServiceProvider();
            byte[] b2 = s.ComputeHash(Gytes(txt));
            s.Clear();
            return Gpass(b2);
        }
        catch { return string.Empty; }
    }
    public static String MD5EN(string txt)
    {
        try
        {
            MD5 m = new MD5CryptoServiceProvider();
            byte[] b2 = m.ComputeHash(Gytes(txt));
            m.Clear();
            return Gpass(b2);
        }
        catch { return string.Empty; }
    }

    /// 使用DES加密
    /// <param name="value">待加密的字符串</param>
    /// <param name="key">密钥(最大长度8)</param>
    /// <param name="IV">初始化向量(最大长度8)</param>
    /// <returns>加密后的字符串</returns>
    public static string Des3EN(string value, string key, string iv)
    {
        try
        {
            key = key.PadRight(8, '0').Substring(0, 8);
            iv = iv.PadRight(8, '0').Substring(0, 8);
            MemoryStream ms = new MemoryStream();
            DES des = new DESCryptoServiceProvider();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(Gytes(key), Gytes(iv)), CryptoStreamMode.Write);
            des.Clear();
            cs.Write(Gytes(value), 0, Gytes(value).Length);
            cs.FlushFinalBlock();
            cs.Clear();
            return Convert.ToBase64String(ms.ToArray());
        }
        catch { return string.Empty; }
    }
    public static string Des3EN(string value, string key)
    {
        return Des3EN(value, key, key);
    }
    public static string Des3DE(string value, string key, string iv)
    {
        try
        {
            key = key.PadRight(8, '0').Substring(0, 8);
            iv = iv.PadRight(8, '0').Substring(0, 8);
            MemoryStream ms = new MemoryStream();
            DES des = new DESCryptoServiceProvider();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(Gytes(key), Gytes(iv)), CryptoStreamMode.Write);
            des.Clear();
            cs.Write(Gbase(value), 0, Gbase(value).Length);
            cs.FlushFinalBlock();
            cs.Clear();
            return Gutf8(ms.ToArray()).ToString();
        }
        catch { return string.Empty; }
    }
    public static string Des3DE(string value, string key)
    {
        return Des3DE(value, key, key);
    }
}

posted @ 2007-08-03 14:15 年轻活力阅读(911) 评论(0) 编辑

2007年7月25日

浮动的层

posted @ 2007-07-25 21:59 年轻活力阅读(210) 评论(0) 编辑

2007年7月22日

WEBForm和WinForm用SHA1加密时，有时会出现不一至的原因

1