【C#】常用的一些方法

    记录一下一些在编程过程中常用的方法

1.获取时间戳    

 public static long GetTimeSpan()
        {
            var time = DateTime.Now;
            DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new     System.DateTime(1970, 1, 1, 0, 0, 0, 0));
            long t = (time.Ticks - startTime.Ticks) / 10000;   //除10000调整为13位      
            return t;
        }

2.Base64编码

  public static string Base64Code(string Message)
        {
            byte[] encData_byte = new byte[Message.Length];
            encData_byte = System.Text.Encoding.UTF8.GetBytes(Message);
            string encodedData = Convert.ToBase64String(encData_byte);
            return encodedData;
        }

3.Md5加密

 public static string Md5Create(string value, string signMethod = "md5")
        {
            // 第三步：使用MD5/HMAC加密
            byte[] bytes;
            if (Constants.SIGN_METHOD_HMAC.Equals(signMethod))
            {
                HMACMD5 hmac = new HMACMD5();
                bytes = hmac.ComputeHash(Encoding.UTF8.GetBytes(value.ToString()));
                hmac.Dispose();
            }
            else
            {
                MD5 md5 = MD5.Create();
                bytes = md5.ComputeHash(Encoding.UTF8.GetBytes(value.ToString()));
                md5.Dispose();
            }

            // 第四步：把二进制转化为大写的十六进制
            StringBuilder result = new StringBuilder();
            for (int i = 0; i < bytes.Length; i++)
            {
                result.Append(bytes[i].ToString("X2"));
            }
            return result.ToString();
        }

4.短链接算法（不记得从哪抄的）

  public static string[] ShortUrl(string url)
         {
             //可以自定义生成MD5加密字符传前的混合KEY
             string key = "aleader";
             //要使用生成URL的字符
             string[] chars = new string[]
             {
                 "a", "b", "c", "d", "e", "f", "g", "h",
                 "i", "j", "k", "l", "m", "n", "o", "p",
                 "q", "r", "s", "t", "u", "v", "w", "x",
                 "y", "z", "0", "1", "2", "3", "4", "5",
                 "6", "7", "8", "9", "A", "B", "C", "D",
                 "E", "F", "G", "H", "I", "J", "K", "L",
                 "M", "N", "O", "P", "Q", "R", "S", "T",
                 "U", "V", "W", "X", "Y", "Z"
             };
             //对传入网址进行MD5加密
             string hex = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(key + url, "md5");

             string[] resUrl = new string[4];
             for (int i = 0; i< 4; i++)
             {
                 //把加密字符按照8位一组16进制与0x3FFFFFFF进行位与运算
                 int hexint = 0x3FFFFFFF & Convert.ToInt32("0x" + hex.Substring(i * 8, 8), 16);
                 string outChars = string.Empty;
                 for (int j = 0; j< 6; j++)
                 {
                     //把得到的值与0x0000003D进行位与运算，取得字符数组chars索引
                     int index = 0x0000003D & hexint;
                     //把取得的字符相加
                     outChars += chars[index];
                     //每次循环按位右移5位
                     hexint = hexint >> 5;
                 }
                 //把字符串存入对应索引的输出数组
                 resUrl[i] = outChars;
             }
             return resUrl;
         }

5.url编码（对大小写有要求的情况下）

       public static string UrlEncoding(string content)
        {
            var result = new StringBuilder();
            foreach (char c in content)
            {
                var u = HttpUtility.UrlEncode(c.ToString());
                if (u.Length > 1)
                {
                    u=u.ToUpper();
                }
                result.Append(u);
            }
            return result.ToString();
        }

6.HttpGet

7.HttpPost