最近做拼XML,注意2点

1.StringBuilder这个东西在调试的时候，如果过长就只显示一半，我还以为是长度限制，郁闷半天╮(╯▽╰)╭

2.xml有5个特殊字符串要过滤的

       #region xml字符转义
        public static string ReplaceESC(string str)
        {
            return str.Replace("&", "&amp;").Replace("&nbsp;", " ").Replace("<", "&lt;").Replace(">", "&gt;").Replace("'", "&apos;").Replace("\"", "&quot;");
        }
        #endregion

 3.declare @da datetime
set @da ='2001-02-12'
select dateadd(DAY,1,@da) 添加一天，具体用法如下

  select   IndexID  from Tab_CollectComment  
       where   CommentDate between  @BeginDate  and  dateadd(DAY,1,@BeginDate  )
 

4。C#判断时间段

   public static Boolean DateInBeginEnd(string now, string begin, string end)
        {
            if (DateTime.Now > DateTime.Parse(begin) && DateTime.Now < DateTime.Parse(end))
            {
                return true;//再此时间段
            }
            return false;
        }

5。C#操作cookie

    #region 操作Cookie
   
        public static void SetCookie(string CookieName, string CookieValue)
        {
            CookieValue = Encrypt(CookieValue);
            System.Web.HttpContext.Current.Response.Cookies[CookieName].Value = CookieValue;
            //System.Web.HttpContext.Current.Response.Cookies[CookieName].Domain = "it168.com";
        }
        public static void SetCookie(string CookieName, string CookieValue, DateTime ExpireTime)
        {
            System.Web.HttpContext.Current.Response.Cookies[CookieName].Expires = ExpireTime;
            SetCookie(CookieName, CookieValue);
        }

        /// 读取加密过的COOKIE
        public static string GetCookie(string CookieName)
        {
            string CookieValue = null;
            if (System.Web.HttpContext.Current.Request.Cookies[CookieName] != null)
            {
                CookieValue = Decrypt(System.Web.HttpContext.Current.Request.Cookies[CookieName].Value);
            }
            return CookieValue;
        }

        /// 删除COOKIE
        public static void DelCookie(string CookieName)
        {
            SetCookie(CookieName, "", DateTime.Now.AddYears(-1));
        }
        #endregion

        #region 过滤掉字符串中所有html元素
        public static string CutAllHtmlElement(string InputStr)
        {
            return Regex.Replace(InputStr, @"<[^>]+>", "");
        }
        public static string CutAllHtmlElement_All(string InputStr)
        {
            return Regex.Replace(InputStr, @"<([\s\S]*?)>", "");
        }
        #endregion

        #region 过滤html中危险标签
        public static string CutDangerousHtmlElement(string html)
        {
            System.Text.RegularExpressions.Regex regex1 = new System.Text.RegularExpressions.Regex(@"<script[^>]*>[^>]*<[^>]script[^>]*>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            //System.Text.RegularExpressions.Regex regex2 = new System.Text.RegularExpressions.Regex(@" href *= *[\s\S]*script *:", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            //System.Text.RegularExpressions.Regex regex3 = new System.Text.RegularExpressions.Regex(@" on[\s\S]*=", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex4 = new System.Text.RegularExpressions.Regex(@"<iframe[^>]*>[^>]*<[^>]iframe[^>]*>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex5 = new System.Text.RegularExpressions.Regex(@"<frameset[^>]*>[^>]*<[^>]frameset[^>]*>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            System.Text.RegularExpressions.Regex regex6 = new System.Text.RegularExpressions.Regex(@"<img (.+?) />", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
            html = regex1.Replace(html, ""); //过滤<script></script>标记  
            //html = regex2.Replace(html, ""); //过滤href=javascript: (<a>) 属性  
            //html = regex3.Replace(html, " _disibledevent="); //过滤其它控件的on...事件  
            html = regex4.Replace(html, ""); //过滤iframe  
            html = regex5.Replace(html, ""); //过滤frameset 

            html = regex6.Replace(html, "<img  " + "${1}" + " />");

            return html;
        }
        #endregion

        #region 计算两个日期的时间间隔
        /// <summary>
        /// 计算两个日期的时间间隔
        /// </summary>
        /// <param name="DateTime1">第一个日期和时间</param>
        /// <param name="DateTime2">第二个日期和时间</param>
        /// <returns></returns>
        public static int DateDiff(DateTime DateTime1, DateTime DateTime2, int flag)
        {
            int dateDiff = 0;

            TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
            TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
            TimeSpan ts = ts1.Subtract(ts2);
            dateDiff = //ts.Days.ToString() + "天"
                // + ts.Hours.ToString() + "小时"
                //+ ts.Minutes.ToString() + "分钟"
                ts.Seconds; //+ "秒";
            if (flag == 1)
            {
                dateDiff = ts.Hours;
            }
            else if (flag == 2)
            {
                dateDiff = ts.Days;
            }
            return dateDiff;
        }
        #endregion

判断是中文

        #region 判断是中文
        /// <summary>
        /// 判断是中文
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static bool IsChineseLetter(string input)
        {
            bool isChineseLetter = false;
            if (!string.IsNullOrEmpty(input))
            {
                int bC = 0;
                for (int i = 0; i < input.Length; i++)
                {
                    Regex rx = new Regex("^[\u4e00-\u9fa5]$");
                    if (rx.IsMatch(input[i].ToString()))
                    {
                        bC++;
                    }
                }
                if (bC == 0)
                    isChineseLetter = false;
                else
                    isChineseLetter = true;
            }
            else
            {
                isChineseLetter = false;
            }
            return isChineseLetter;
        }
        #endregion

 XML 字符转义

        #region xml字符转义
        public static string ReplaceESC(string str)
        {
            return str.Replace("&", "&amp;").Replace("&nbsp;", " ").Replace("<", "&lt;").Replace(">", "&gt;").Replace("'", "&apos;").Replace("\"", "&quot;");
        }
        #endregion
 

HTML字符转义

 
        #region html字符转义
        public static string HtmlFilter(string str)
        { 
            return str.Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;").Replace("\"", "&quot;");
        }
        #endregion