using System;
using System.Web;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using System.Collections.Generic;
using Microsoft.VisualBasic;

/// <summary>
///ExtString 的摘要说明
/// </summary>
public static class MyExtensions
{
    public static bool IsDecimal(this string str)
    {
        decimal test;
        return decimal.TryParse(str, out test);
    }
    public static bool IsDecimal(this string str, out decimal test)
    {
        return decimal.TryParse(str, out test);
    }

    public static bool IsDouble(this string str)
    {
        double test;
        return double.TryParse(str, out test);
    }
    public static bool IsDouble(this string str, out double test)
    {
        return double.TryParse(str, out test);
    }
    
    /// <summary>
    /// 格式化数字，三位加逗号
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string ToFormatString(this decimal str)
    {
        string str1 = str.ToString();
        return str1.IndexOf('.') >= 0 ? str.ToString("#,##0" + ".".PadRight(str1.Substring(str1.IndexOf('.')).Length, '0')) : str.ToString("#,##0");
    }
    /// <summary>
    /// 相加
    /// </summary>
    /// <param name="add1"></param>
    /// <param name="add2"></param>
    /// <returns></returns>
    public static double Add(this double d1, double d2)
    {
        return (double)((decimal)d1 + (decimal)d2);
    }
    /// <summary>
    /// 相减
    /// </summary>
    /// <param name="d1"></param>
    /// <param name="d2"></param>
    /// <returns></returns>
    public static double sub(this double d1, double d2)
    {
        return (double)((decimal)d1 - (decimal)d2);
    }
    /// <summary>
    /// 相乖
    /// </summary>
    /// <param name="d1"></param>
    /// <param name="d2"></param>
    /// <returns></returns>
    public static double mul(this double d1, double d2)
    {
        return (double)((decimal)d1 * (decimal)d2);
    }
    /// <summary>
    /// 相除
    /// </summary>
    /// <param name="d1"></param>
    /// <param name="d2"></param>
    /// <returns></returns>
    public static double div(this double d1, double d2)
    {
        return d2 == 0 ? 0 : (double)((decimal)d1 / (decimal)d2);
    }
    public static bool IsInt(this string str)
    {
        int test;
        return int.TryParse(str, out test);
    }
    public static bool IsInt(this string str, out int test)
    {
        return int.TryParse(str, out test);
    }
    /// <summary>
    /// 将数组转换为符号分隔的字符串
    /// </summary>
    /// <param name="arr"></param>
    /// <param name="split">分隔符</param>
    /// <returns></returns>
    public static string Join1<T>(this T[] arr, string split = ",")
    {
        StringBuilder sb = new StringBuilder(arr.Length * 36);
        for (int i = 0; i < arr.Length; i++)
        {
            sb.Append(arr[i].ToString());
            if (i < arr.Length - 1)
            {
                sb.Append(split);
            }
        }
        return sb.ToString();
    }

    /// <summary>
    /// 去除所有空格
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string RemoveSpace(this string str)
    {
        if (str.IsNullOrEmpty()) return "";
        return str.Replace("", " ").Replace("\r", "").Replace("\n", "");
    }

    public static bool IsLong(this string str)
    {
        long test;
        return long.TryParse(str, out test);
    }
    public static bool IsLong(this string str, out long test)
    {
        return long.TryParse(str, out test);
    }

    public static bool IsDateTime(this string str)
    {
        DateTime test;
        return DateTime.TryParse(str, out test);
    }
    public static bool IsDateTime(this string str, out DateTime test)
    {
        return DateTime.TryParse(str, out test);
    }

    public static bool IsGuid(this string str)
    {
        Guid test;
        return Guid.TryParse(str, out test);
    }
    public static bool IsGuid(this string str, out Guid test)
    {
        return Guid.TryParse(str, out test);
    }
    /// <summary>
    /// 判断是否为Guid.Empty
    /// </summary>
    /// <param name="guid"></param>
    /// <returns></returns>
    public static bool IsEmptyGuid(this Guid guid)
    {
        return guid == Guid.Empty;
    }

    public static bool IsUrl(this string str)
    {
        if (str.IsNullOrEmpty())
            return false;
        string pattern = @"^(http|https|ftp|rtsp|mms):(\/\/|\\\\)[A-Za-z0-9%\-_@]+\.[A-Za-z0-9%\-_@]+[A-Za-z0-9\.\/=\?%\-&_~`@:\+!;]*$";
        return Regex.IsMatch(str, pattern, RegexOptions.IgnoreCase);
    }

    public static bool IsEmail(this string str)
    {
        return Regex.IsMatch(str, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
    }
    /// <summary>
    /// 判断一个整型是否包含在指定的值内
    /// </summary>
    /// <param name="i"></param>
    /// <returns></returns>
    public static bool In(this int i, params int[] ints)
    {
        foreach (int k in ints)
        {
            if (i == k)
            {
                return true;
            }
        }
        return false;
    }

    /// <summary>
    /// 返回值或DBNull.Value
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static object DBValueOrNull(this string str)
    {
        if (str.IsNullOrEmpty())
        {
            return null;
        }
        else
        {
            return str;
        }
    }

    public static decimal ToDecimal(this string str, int decimals)
    {
        decimal test;
        return decimal.TryParse(str, out test) ? decimal.Round(test, decimals, MidpointRounding.AwayFromZero) : 0;
    }
    public static decimal ToDecimal(this string str)
    {
        decimal test;
        return decimal.TryParse(str, out test) ? test : 0;
    }
    public static decimal Round(this decimal dec, int decimals = 2)
    {
        return Math.Round(dec, decimals, MidpointRounding.AwayFromZero);
    }
    public static double ToDouble(this string str, int digits)
    {
        double test;
        return double.TryParse(str, out test) ? test.Round(digits) : 0;
    }
    public static double ToDouble(this string str)
    {
        double test;
        return double.TryParse(str, out test) ? test : 0;
    }
    public static double Round(this double value, int decimals)
    {
        if (value < 0)
            return Math.Round(value + 5 / Math.Pow(10, decimals + 1), decimals, MidpointRounding.AwayFromZero);
        else
            return Math.Round(value, decimals, MidpointRounding.AwayFromZero);
    }
    public static short ToShort(this string str)
    {
        short test;
        short.TryParse(str, out test);
        return test;
    }
    public static int? ToIntOrNull(this string str)
    {
        int test;
        if (int.TryParse(str, out test))
        {
            return test;
        }
        else
        {
            return null;
        }
    }
    public static int ToInt(this string str)
    {
        int test;
        int.TryParse(str, out test);
        return test;
    }
    public static int ToInt(this string str, int defaultValue)
    {
        int test;
        return int.TryParse(str, out test) ? test : defaultValue;
    }
    
    public static long ToLong(this string str)
    {
        long test;
        long.TryParse(str, out test);
        return test;
    }
    public static Int16 ToInt16(this string str)
    {
        Int16 test;
        Int16.TryParse(str, out test);
        return test;
    }
    public static Int32 ToInt32(this string str)
    {
        Int32 test;
        Int32.TryParse(str, out test);
        return test;
    }
    public static Int64 ToInt64(this string str)
    {
        Int64 test;
        Int64.TryParse(str, out test);
        return test;
    }

    public static DateTime ToDateTime(this string str)
    {
        DateTime test;
        DateTime.TryParse(str, out test);
        return test;
    }
    public static DateTime? ToDateTimeOrNull(this string str)
    {
        DateTime test;
        if (DateTime.TryParse(str, out test))
        {
            return test;
        }
        return null;
    }
    public static Guid ToGuid(this string str)
    {
        Guid test;
        if (Guid.TryParse(str, out test))
        {
            return test;
        }
        else
        {
            return Guid.Empty;
        }
    }

    /// <summary>
    /// 尝试转换为Boolean类型
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static bool ToBoolean(this string str)
    {
        bool b;
        return Boolean.TryParse(str, out b) ? b : false;
    }

    /// <summary>
    /// 尝试格式化日期字符串
    /// </summary>
    /// <param name="date"></param>
    /// <param name="format"></param>
    /// <returns></returns>
    public static string DateFormat(this object date, string format = "yyyy/MM/dd")
    {
        if (date == null) { return string.Empty; }
        DateTime d;
        if (!date.ToString().IsDateTime(out d))
        {
            return date.ToString();
        }
        else
        {
            return d.ToString(format);
        }
    }

    public static bool IsNullOrEmpty(this string str)
    {
        return string.IsNullOrWhiteSpace(str);
    }

    public static string ToString(this IList<string> strList, char split)
    {
        return strList.ToString(split.ToString());
    }

    public static string ToString(this IList<string> strList, string split)
    {
        StringBuilder sb = new StringBuilder(strList.Count * 10);
        for (int i = 0; i < strList.Count; i++)
        {
            sb.Append(strList[i]);
            if (i < strList.Count - 1)
            {
                sb.Append(split);
            }
        }
        return sb.ToString();
    }

    /// <summary>
    /// 过滤sql
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string ReplaceSql(this string str)
    {
        str = str.Replace("'", "").Replace("--", " ").Replace(";", "");
        return str;
    }
    /// <summary>
    /// 过滤查询sql
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string ReplaceSelectSql(this string str)
    {
        if (str.IsNullOrEmpty()) return "";
        str = str.Replace1("DELETE ", "").Replace1("UPDATE ", "").Replace1("INSERT ", "");
        return str;
    }
    /// <summary>
    /// 过滤字符串(不区分大小写)
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string Replace1(this string str, string oldString, string newString)
    {
        return str.IsNullOrEmpty() ? "" : Strings.Replace(str, oldString, newString, 1, -1, CompareMethod.Text);
    }
    /// <summary>
    /// 获取汉字拼音的第一个字母
    /// </summary>
    /// <param name="strText"></param>
    /// <returns></returns>
    public static string ToChineseSpell(this string strText)
    {
        int len = strText.Length;
        string myStr = "";
        for (int i = 0; i < len; i++)
        {
            myStr += getSpell(strText.Substring(i, 1));
        }
        return myStr.ToLower();
    }
    /// <summary>
    /// 获取汉字拼音
    /// </summary>
    /// <param name="cnChar"></param>
    /// <returns></returns>
    public static string getSpell(this string cnChar)
    {
        byte[] arrCN = Encoding.Default.GetBytes(cnChar);
        if (arrCN.Length > 1)
        {
            int area = (short)arrCN[0];
            int pos = (short)arrCN[1];
            int code = (area << 8) + pos;
            int[] areacode = { 45217, 45253, 45761, 46318, 46826, 47010, 47297, 47614, 48119, 48119, 49062, 49324, 49896, 50371, 50614, 50622, 50906, 51387, 51446, 52218, 52698, 52698, 52698, 52980, 53689, 54481 };
            for (int i = 0; i < 26; i++)
            {
                int max = 55290;
                if (i != 25) max = areacode[i + 1];
                if (areacode[i] <= code && code < max)
                {
                    return Encoding.Default.GetString(new byte[] { (byte)(65 + i) });
                }
            }
            return "x";
        }
        else return cnChar;
    }

    /// <summary>
    /// 截取字符串，汉字两个字节，字母一个字节
    /// </summary>
    /// <param name="str">字符串</param>
    /// <param name="strLength">字符串长度</param>
    /// <returns></returns>
    public static string Interruption(this string str, int len, string show)
    {
        ASCIIEncoding ascii = new ASCIIEncoding();
        int tempLen = 0;
        string tempString = "";
        byte[] s = ascii.GetBytes(str);
        for (int i = 0; i < s.Length; i++)
        {
            if ((int)s[i] == 63)
            { tempLen += 2; }
            else
            { tempLen += 1; }
            try
            { tempString += str.Substring(i, 1); }
            catch
            { break; }
            if (tempLen > len) break;
        }
        //如果截过则加上半个省略号 
        byte[] mybyte = System.Text.Encoding.Default.GetBytes(str);
        if (mybyte.Length > len)
            tempString += show;
        tempString = tempString.Replace("&nbsp;", " ");
        tempString = tempString.Replace("&lt;", "<");
        tempString = tempString.Replace("&gt;", ">");
        tempString = tempString.Replace('\n'.ToString(), "<br>");
        return tempString;
    }

    /// <summary>
    /// 截取字符串，汉字两个字节，字母一个字节
    /// </summary>
    /// <param name="str">字符串</param>
    /// <param name="strLength">字符串长度</param>
    /// <returns></returns>
    public static string CutString(this string str, int len, string show = "...")
    {
        return Interruption(str, len, show);
    }

    /// <summary>
    /// 获取左边多少个字符
    /// </summary>
    /// <param name="str"></param>
    /// <param name="len"></param>
    /// <returns></returns>
    public static string Left(this string str, int len)
    {
        if (str == null || len < 1) { return ""; }
        if (len < str.Length)
        { return str.Substring(0, len); }
        else
        { return str; }
    }
    /// <summary>
    /// 获取右边多少个字符
    /// </summary>
    /// <param name="str"></param>
    /// <param name="len"></param>
    /// <returns></returns>
    public static string Right(this string str, int len)
    {
        if (str == null || len < 1) { return ""; }
        if (len < str.Length)
        { return str.Substring(str.Length - len); }
        else
        { return str; }
    }

    /// <summary>
    /// 得到实符串实际长度
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static int Size(this string str)
    {
        byte[] strArray = System.Text.Encoding.Default.GetBytes(str);
        int res = strArray.Length;
        return res;
    }
    ///   <summary>   
    ///   去除HTML标记   
    ///   </summary>   
    ///   <param   name="NoHTML">包括HTML的源码   </param>   
    ///   <returns>已经去除后的文字</returns>   
    public static string RemoveHTML(this string Htmlstring)
    {
        //删除脚本   
        Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);
        //删除HTML   
        Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);

        Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", "   ", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase);
        Htmlstring = Regex.Replace(Htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase);

        Htmlstring.Replace("<", "");
        Htmlstring.Replace(">", "");
        Htmlstring.Replace("\r\n", "");
        Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();

        return Htmlstring;
    }
    /// <summary>
    /// 过滤js脚本
    /// </summary>
    /// <param name="strFromText"></param>
    /// <returns></returns>
    public static string RemoveScript(this string html)
    {
        if (html.IsNullOrEmpty()) return string.Empty;
        System.Text.RegularExpressions.Regex regex1 = new System.Text.RegularExpressions.Regex(@"<script[\s\S]+</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[\s\S]+</iframe *>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex5 = new System.Text.RegularExpressions.Regex(@"<frameset[\s\S]+</frameset *>", 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
        return html;
    }
    /// <summary>
    /// 替换页面标签
    /// </summary>
    /// <param name="html"></param>
    /// <returns></returns>
    public static string RemovePageTag(this string html)
    {
        if (html.IsNullOrEmpty()) return string.Empty;
        System.Text.RegularExpressions.Regex regex0 = new System.Text.RegularExpressions.Regex(@"<!DOCTYPE[^>]*>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex1 = new System.Text.RegularExpressions.Regex(@"<html\s*", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex2 = new System.Text.RegularExpressions.Regex(@"<head[\s\S]+</head\s*>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex3 = new System.Text.RegularExpressions.Regex(@"<body\s*", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex4 = new System.Text.RegularExpressions.Regex(@"<form\s*", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        System.Text.RegularExpressions.Regex regex5 = new System.Text.RegularExpressions.Regex(@"</(form|body|head|html)>", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
        html = regex0.Replace(html, ""); //过滤<html>标记
        html = regex1.Replace(html, "<html\u3000 "); //过滤<html>标记
        html = regex2.Replace(html, ""); //过滤<head>属性
        html = regex3.Replace(html, "<body\u3000 "); //过滤<body>属性
        html = regex4.Replace(html, "<form\u3000 "); //过滤<form>属性
        html = regex5.Replace(html, "</$1\u3000>"); //过滤</html></body></head></form>属性
        return html;
    }

    /// <summary>
    /// 取得html中的图片
    /// </summary>
    /// <param name="HTMLStr"></param>
    /// <returns></returns>
    public static string GetImg(this string text)
    {
        string str = string.Empty;
        Regex r = new Regex(@"<img\s+[^>]*\s*src\s*=\s*([']?)(?<url>\S+)'?[^>]*>", //注意这里的(?<url>\S+)是按正则表达式中的组来处理的，下面的代码中用使用到，也可以更改成其它的HTML标签，以同样的方法获得内容！
        RegexOptions.Compiled);
        Match m = r.Match(text.ToLower());
        if (m.Success)
            str = m.Result("${url}").Replace("\"", "").Replace("'", "");
        return str;
    }
    /// <summary>
    /// 取得html中的所有图片
    /// </summary>
    /// <param name="text"></param>
    /// <returns></returns>
    public static string[] GetImgs(this string text)
    {
        List<string> imgs = new List<string>();
        string pat = @"<img\s+[^>]*\s*src\s*=\s*([']?)(?<url>\S+)'?[^>]*>";
        Regex r = new Regex(pat, RegexOptions.Compiled);
        Match m = r.Match(text.ToLower());
        while (m.Success)
        {
            imgs.Add(m.Result("${url}").Replace("\"", "").Replace("'", ""));
            m = m.NextMatch();
        }
        return imgs.ToArray();
    }
    /// <summary>
    /// 产生随机字符串
    /// </summary>
    /// <returns>字符串位数</returns>
    public static string GetRandom(int length)
    {
        int number;
        char code;
        string checkCode = String.Empty;
        System.Random random = new Random();

        for (int i = 0; i < length + 1; i++)
        {
            number = random.Next();
            if (number % 2 == 0)
                code = (char)('0' + (char)(number % 10));
            else
                code = (char)('A' + (char)(number % 26));
            checkCode += code.ToString();
        }
        return checkCode;
    }

    /// <summary>
    /// 字符串是否包含标点符号(不包括_下画线)
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static bool InPunctuation(this string str)
    {
        foreach (char c in str.ToCharArray())
        {
            if (char.IsPunctuation(c) && c != '_')
                return true;
        }
        return false;

    }
    /// <summary>
    /// 去除字符串标点符号和空字符
    /// </summary>
    /// <param name="sourceString"></param>
    /// <returns></returns>
    public static string RemovePunctuationOrEmpty(this string str)
    {
        StringBuilder NewString = new StringBuilder(str.Length);
        char[] charArr = str.ToCharArray();
        foreach (char symbols in charArr)
        {
            if (!char.IsPunctuation(symbols) && !char.IsWhiteSpace(symbols))
            {
                NewString.Append(symbols);
            }
        }
        return NewString.ToString();
    }
    /// <summary>
    /// 返回带星期的日期格式
    /// </summary>
    /// <param name="date"></param>
    /// <returns></returns>
    public static string ToDateWeekString(this DateTime date)
    {
        string week = string.Empty;
        switch (date.DayOfWeek)
        {
            case DayOfWeek.Friday: week = "五"; break;
            case DayOfWeek.Monday: week = "一"; break;
            case DayOfWeek.Saturday: week = "六"; break;
            case DayOfWeek.Sunday: week = "日"; break;
            case DayOfWeek.Thursday: week = "四"; break;
            case DayOfWeek.Tuesday: week = "二"; break;
            case DayOfWeek.Wednesday: week = "三"; break;
        }
        return date.ToString("yyyy年M月d日 ") + "星期" + week;
    }
    /// <summary>
    /// 返回带星期的日期时间格式
    /// </summary>
    /// <param name="date"></param>
    /// <returns></returns>
    public static string ToDateTimeWeekString(this DateTime date)
    {
        string week = string.Empty;
        switch (date.DayOfWeek)
        {
            case DayOfWeek.Friday: week = "五"; break;
            case DayOfWeek.Monday: week = "一"; break;
            case DayOfWeek.Saturday: week = "六"; break;
            case DayOfWeek.Sunday: week = "日"; break;
            case DayOfWeek.Thursday: week = "四"; break;
            case DayOfWeek.Tuesday: week = "二"; break;
            case DayOfWeek.Wednesday: week = "三"; break;
        }
        return date.ToString("yyyy年M月d日H时m分") + " 星期" + week;
    }
    /// <summary>
    /// HTML编码
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string HtmlEncode(this string str)
    {
        return HttpContext.Current.Server.HtmlEncode(str);
    }
    /// <summary>
    /// URL编码
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string UrlEncode(this string str)
    {
        return str.IsNullOrEmpty() ? string.Empty : HttpContext.Current.Server.UrlEncode(str);
    }
    /// <summary>
    /// URL解码
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string UrlDecode(this string str)
    {
        return str.IsNullOrEmpty() ? string.Empty : HttpContext.Current.Server.UrlDecode(str);
    }

    /// <summary>
    /// 获取与 Web 服务器上的指定虚拟路径相对应的物理文件路径。
    /// </summary>
    /// <param name="Server"></param>
    /// <param name="path"></param>
    /// <returns></returns>
    public static string MapPathExt(this HttpServerUtility Server, string path)
    {
        if (path.StartsWith(@"\\") || path.Contains(":"))
        {
            return path;
        }
        else
        {
            return Server.MapPath(path);
        }
    }

    /// <summary>
    /// 使用CDATA的方式将value保存在指定的element中
    /// </summary>
    /// <param name="element"></param>
    /// <param name="value"></param>
    public static void SetCDataValue(this System.Xml.Linq.XElement element, string value)
    {
        element.RemoveNodes();
        element.Add(new System.Xml.Linq.XCData(value));
    }

    /// <summary>
    /// 返回一个值，该值指示指定的 System.String 对象是否出现在此字符串中。
    /// </summary>
    /// <param name="source"></param>
    /// <param name="value">要搜寻的字符串。</param>
    /// <param name="comparisonType">指定搜索规则的枚举值之一</param>
    /// <returns>如果 value 参数出现在此字符串中，或者 value 为空字符串 ("")，则为 true；否则为 false</returns>
    public static bool Contains(this string source, string value, StringComparison comparisonType)
    {
        if (source == null || value == null) { return false; }
        if (value == "") { return true; }
        return (source.IndexOf(value, comparisonType) >= 0);
    }

    /// <summary>
    /// 通过使用默认的相等或字符比较器确定序列是否包含指定的元素。
    /// </summary>
    /// <param name="source">要在其中定位某个值的序列。</param>
    /// <param name="value">要在序列中定位的值。</param>
    /// <param name="comparisonType">指定搜索规则的枚举值之一</param>
    /// <exception cref="System.ArgumentNullException">source 为 null</exception>
    /// <returns>如果源序列包含具有指定值的元素，则为 true；否则为 false。</returns>
    public static bool Contains(this string[] source, string value, StringComparison comparisonType)
    {
        return System.Linq.Enumerable.Contains(source, value, new CompareText(comparisonType));
    }
    private class CompareText : IEqualityComparer<string>
    {
        private StringComparison m_comparisonType { get; set; }
        public int GetHashCode(string t) { return t.GetHashCode(); }
        public CompareText(StringComparison comparisonType) { this.m_comparisonType = comparisonType; }
        public bool Equals(string x, string y)
        {
            if (x == y) { return true; }
            if (x == null || y == null) { return false; }
            else { return x.Equals(y, m_comparisonType); }
        }
    }

    /// <summary>
    /// 序列化对象为xml字符串
    /// </summary>
    /// <param name="obj">要序列化的对象</param>
    /// <returns>xml格式字符串</returns>
    public static string Serialize(this object obj)
    {
        if (obj == null) { return ""; }
        Type type = obj.GetType();
        if (type.IsSerializable)
        {
            try
            {
                System.Text.StringBuilder sb = new System.Text.StringBuilder();
                System.Xml.Serialization.XmlSerializer xs = new System.Xml.Serialization.XmlSerializer(type);
                XmlWriterSettings xset = new XmlWriterSettings();
                xset.CloseOutput = true;
                xset.Encoding = Encoding.UTF8;
                xset.Indent = true;
                xset.CheckCharacters = false;
                System.Xml.XmlWriter xw = System.Xml.XmlWriter.Create(sb, xset);
                xs.Serialize(xw, obj);
                xw.Flush();
                xw.Close();
                return sb.ToString();
            }
            catch { return ""; }
        }
        else
        {
            return "";
        }
    }

    /// <summary>
    /// AES加密字符串
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string AesEncrypt(this string str)
    {
        return RoadFlow.Utility.Encryption.Encrypt(str);
    }
    /// <summary>
    /// AES解密字符串
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string AesDecrypt(this string str)
    {
        return RoadFlow.Utility.Encryption.Decrypt(str);
    }

    /// <summary>
    /// DES加密字符串
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string DesEncrypt(this string str)
    {
        return RoadFlow.Utility.EncryptionDes.Encrypt(str);
    }
    /// <summary>
    /// DES解密字符串
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string DesDecrypt(this string str)
    {
        return RoadFlow.Utility.EncryptionDes.Decrypt(str);
    }

    /// <summary>
    /// 让服务器按钮点击后变灰
    /// </summary>
    /// <param name="button"></param>
    /// <param name="newText">点后的显示文本</param>
    public static void ClickDisabled(this System.Web.UI.WebControls.Button button, string newText = "")
    {
        if (button == null) return;
        StringBuilder js = new StringBuilder();
        System.Web.UI.Page page = (System.Web.UI.Page)HttpContext.Current.Handler;
        page.ClientScript.GetPostBackEventReference(button, string.Empty);

        if (!button.ValidationGroup.IsNullOrEmpty())
        {
            js.AppendFormat("if({0})", button.ValidationGroup);
            js.Append("{");
            if (!button.OnClientClick.IsNullOrEmpty())
            {
                js.Append(button.OnClientClick);
            }
            js.Append("this.disabled=true;");
            if (!newText.IsNullOrEmpty())
            {
                js.AppendFormat("this.value=\"{0}\";", newText);
            }
            js.AppendFormat("__doPostBack(\"{0}\",\"\");", button.ID);
            js.Append("}else{return false;}");
        }
        else
        {
            if (!button.OnClientClick.IsNullOrEmpty())
            {
                js.Append(button.OnClientClick);
            }
            js.Append("this.disabled=true;");
            if (!newText.IsNullOrEmpty())
            {
                js.AppendFormat("this.value=\"{0}\";", newText);
            }
            js.AppendFormat("__doPostBack(\"{0}\",\"\");", button.ID);
        }
        button.OnClientClick = js.ToString();
    }

    /// <summary>
    /// 将int类型转为GUID格式
    /// </summary>
    /// <param name="i"></param>
    /// <returns></returns>
    public static Guid ToGuid(this int i)
    {
        return i.ToString("00000000-0000-0000-0000-000000000000").ToGuid();
    }
    /// <summary>
    /// 将guid转换为int
    /// </summary>
    /// <param name="guid"></param>
    /// <returns></returns>
    public static int ToInt(this Guid guid)
    {
        return guid.ToString("N").TrimStart('0').ToInt();
    }


    public static string ToDateString(this string date)
    {
        return date.ToDateTime().ToString(RoadFlow.Utility.Config.DateFormat);
    }

    public static string ToDateTimeString(this string dateTime)
    {
        return dateTime.ToDateTime().ToString(RoadFlow.Utility.Config.DateTimeFormat);
    }

    public static string ToDateTimeStringS(this string dateTime)
    {
        return dateTime.ToDateTime().ToString(RoadFlow.Utility.Config.DateTimeFormatS);
    }

    public static string ToDateString(this DateTime date)
    {
        return date.ToString(RoadFlow.Utility.Config.DateFormat);
    }

    public static string ToDateTimeString(this DateTime dateTime)
    {
        return dateTime.ToString(RoadFlow.Utility.Config.DateTimeFormat);
    }

    public static string ToDateTimeStringS(this DateTime dateTime)
    {
        return dateTime.ToString(RoadFlow.Utility.Config.DateTimeFormatS);
    }
}