C# 一些常用的字符串扩展方法
以下可能是常用的.net扩展方法，记录下
EString.cs文件
/// <summary> /// 扩展字符串类 /// </summary> public static class EString { #region 数据转换 #region 转Int /// <summary> /// 转Int,失败返回0 /// </summary> /// <param name="e"></param> /// <returns></returns> public static int ToInt(this string t) { int n; if (!int.TryParse(t, out n)) return 0; return n; } /// <summary> /// 转Int,失败返回pReturn /// </summary> /// <param name="e"></param> /// <param name="pReturn">失败返回的值</param> /// <returns></returns> public static int ToInt(this string t, int pReturn) { int n; if (!int.TryParse(t, out n)) return pReturn; return n; } /// <summary> /// 是否是Int true:是 false:否 /// </summary> /// <param name="t"></param> /// <returns></returns> public static bool IsInt(this string t) { int n; return int.TryParse(t, out n); } #endregion #region 转Int16 /// <summary> /// 转Int,失败返回0 /// </summary> /// <param name="e"></param> /// <returns></returns> public static Int16 ToInt16(this string t) { Int16 n; if (!Int16.TryParse(t, out n)) return 0; return n; } /// <summary> /// 转Int,失败返回pReturn /// </summary> /// <param name="e"></param> /// <param name="pReturn">失败返回的值</param> /// <returns></returns> public static Int16 ToInt16(this string t, Int16 pReturn) { Int16 n; if (!Int16.TryParse(t, out n)) return pReturn; return n; } /// <summary> /// 是否是Int true:是 false:否 /// </summary> /// <param name="t"></param> /// <returns></returns> public static bool IsInt16(this string t) { Int16 n; return Int16.TryParse(t, out n); } #endregion #region 转byte /// <summary> /// 转byte,失败返回0 /// </summary> /// <param name="e"></param> /// <returns></returns> public static byte Tobyte(this string t) { byte n; if (!byte.TryParse(t, out n)) return 0; return n; } /// <summary> /// 转byte,失败返回pReturn /// </summary> /// <param name="e"></param> /// <param name="pReturn">失败返回的值</param> /// <returns></returns> public static byte Tobyte(this string t, byte pReturn) { byte n; if (!byte.TryParse(t, out n)) return pReturn; return n; } /// <summary> /// 是否是byte true:是 false:否 /// </summary> /// <param name="t"></param> /// <returns></returns> public static bool Isbyte(this string t) { byte n; return byte.TryParse(t, out n); } #endregion #region 转Long /// <summary> /// 转Long,失败返回0 /// </summary> /// <param name="e"></param> /// <returns></returns> public static long ToLong(this string t) { long n; if (!long.TryParse(t, out n)) return 0; return n; } /// <summary> /// 转Long,失败返回pReturn /// </summary> /// <param name="e"></param> /// <param name="pReturn">失败返回的值</param> /// <returns></returns> public static long ToLong(this string t, long pReturn) { long n; if (!long.TryParse(t, out n)) return pReturn; return n; } /// <summary> /// 是否是Long true:是 false:否 /// </summary> /// <param name="t"></param> /// <returns></returns> public static bool IsLong(this string t) { long n; return long.TryParse(t, out n); } #endregion #region 转Double /// <summary> /// 转Int,失败返回0 /// </summary> /// <param name="e"></param> /// <returns></returns> public static double ToDouble(this string t) { double n; if (!double.TryParse(t, out n)) return 0; return n; } /// <summary> /// 转Double,失败返回pReturn /// </summary> /// <param name="e"></param> /// <param name="pReturn">失败返回的值</param> /// <returns></returns> public static double ToDouble(this string t, double pReturn) { double n; if (!double.TryParse(t, out n)) return pReturn; return n; } /// <summary> /// 是否是Double true:是 false:否 /// </summary> /// <param name="t"></param> /// <returns></returns> public static bool IsDouble(this string t) { double n; return double.TryParse(t, out n); } #endregion #region 转Decimal /// <summary> /// 转Decimal,失败返回0 /// </summary> /// <param name="e"></param> /// <returns></returns> public static decimal ToDecimal(this string t) { decimal n; if (!decimal.TryParse(t, out n)) return 0; return n; } /// <summary> /// 转Decimal,失败返回pReturn /// </summary> /// <param name="e"></param> /// <param name="pReturn">失败返回的值</param> /// <returns></returns> public static decimal ToDecimal(this string t, decimal pReturn) { decimal n; if (!decimal.TryParse(t, out n)) return pReturn; return n; } /// <summary> /// 是否是Decimal true:是 false:否 /// </summary> /// <param name="t"></param> /// <returns></returns> public static bool IsDecimal(this string t) { decimal n; return decimal.TryParse(t, out n); } #endregion #region 转DateTime /// <summary> /// 转DateTime,失败返回当前时间 /// </summary> /// <param name="e"></param> /// <returns></returns> public static DateTime ToDateTime(this string t) { DateTime n; if (!DateTime.TryParse(t, out n)) return DateTime.Now; return n; } /// <summary> /// 转DateTime,失败返回pReturn /// </summary> /// <param name="e"></param> /// <param name="pReturn">失败返回的值</param> /// <returns></returns> public static DateTime ToDateTime(this string t, DateTime pReturn) { DateTime n; if (!DateTime.TryParse(t, out n)) return pReturn; return n; } /// <summary> /// 转DateTime,失败返回pReturn /// </summary> /// <param name="e"></param> /// <param name="pReturn">失败返回的值</param> /// <returns></returns> public static string ToDateTime(this string t, string pFormat, string pReturn) { DateTime n; if (!DateTime.TryParse(t, out n)) return pReturn; return n.ToString(pFormat); } /// <summary> /// 转DateTime,失败返回空 /// </summary> /// <param name="e"></param> /// <param name="pReturn">失败返回的值</param> /// <returns></returns> public static string ToDateTime(this string t, string pFormat) { return t.ToDateTime(pFormat, string.Empty); } public static string ToShortDateTime(this string t) { return t.ToDateTime("yyyy-MM-dd", string.Empty); } /// <summary> /// 是否是DateTime true:是 false:否 /// </summary> /// <param name="t"></param> /// <returns></returns> public static bool IsDateTime(this string t) { DateTime n; return DateTime.TryParse(t, out n); } #endregion #region 与int[]相关 /// <summary> /// 转int[],字符串以逗号(,)隔开,请确保字符串内容都合法,否则会出错 /// </summary> /// <param name="pStr"></param> /// <returns></returns> public static int[] ToIntArr(this string t) { return t.ToIntArr(new char[] { ',' }); } /// <summary> /// 转int[],字符串以逗号(,)隔开,请确保字符串内容都合法,否则会出错 /// </summary> /// <param name="t"></param> /// <param name="pSplit">隔开的</param> /// <returns></returns> public static int[] ToIntArr(this string t, char[] pSplit) { if (t.Length == 0) { return new int[] { }; } string[] ArrStr = t.Split(pSplit, StringSplitOptions.None); int[] iStr = new int[ArrStr.Length]; for (int i = 0; i < ArrStr.Length; i++) iStr[i] = int.Parse(ArrStr[i]); return iStr; } #endregion #region 过滤字符串的非int,重新组合成字符串 /// <summary> /// 过滤字符串的非int,重新组合成字符串 /// </summary> /// <param name="t"></param> /// <param name="pSplit">分隔符</param> /// <returns></returns> public static string ClearNoInt(this string t, char pSplit) { string sStr = string.Empty; string[] ArrStr = t.Split(pSplit); for (int i = 0; i < ArrStr.Length; i++) { string lsStr = ArrStr[i]; if (lsStr.IsInt()) sStr += lsStr + pSplit; else continue; } if (sStr.Length > 0) sStr = sStr.TrimEnd(pSplit); return sStr; } /// <summary> /// 过滤字符串的非int,重新组合成字符串 /// </summary> /// <param name="t"></param> /// <returns></returns> public static string ClearNoInt(this string t) { return t.ClearNoInt(','); } #endregion #region 是否可以转换成int[] /// <summary> /// 是否可以转换成int[],true:是,false:否 /// </summary> /// <param name="t"></param> /// <param name="pSplit">分隔符</param> /// <returns></returns> public static bool IsIntArr(this string t, char pSplit) { string[] ArrStr = t.Split(pSplit); bool b = true; for (int i = 0; i < ArrStr.Length; i++) { if (!ArrStr[i].IsInt()) { b = false; break; } } return b; } /// <summary> /// 是否可以转换成int[],true:是,false:否 /// </summary> /// <param name="t"></param> /// <returns></returns> public static bool IsIntArr(this string t) { return t.IsIntArr(','); } #endregion #endregion #region 载取左字符 /// <summary> /// 载取左字符 /// </summary> /// <param name="t"></param> /// <param name="pLen">字符个数</param> /// <param name="pReturn">超出时后边要加的返回的内容</param> /// <returns></returns> public static string Left(this string t, int pLen, string pReturn) { if (t == null || t.Length == 0) return string.Empty; pLen *= 2; int i = 0, j = 0; foreach (char c in t) { if (c > 127) { i += 2; } else { i++; } if (i > pLen) { return t.Substring(0, j) + pReturn; } j++; } return t; } public static string Left(this string t, int pLen) { return Left(t, pLen, string.Empty); } public static string StrLeft(this string t, int pLen) { if (t == null) { return ""; } if (t.Length > pLen) { return t.Substring(0, pLen); } return t; } #endregion #region 删除文件名或路径的特殊字符 private class ClearPathUnsafeList { public static readonly string[] unSafeStr = { "/", "\\", ":", "*", "?", "\"", "<", ">", "|" }; } /// <summary> /// 删除文件名或路径的特殊字符 /// </summary> /// <param name="t"></param> /// <returns></returns> public static string ClearPathUnsafe(this string t) { foreach (string s in ClearPathUnsafeList.unSafeStr) { t = t.Replace(s, ""); } return t; } #endregion #region 字符串真实长度 如:一个汉字为两个字节 /// <summary> /// 字符串真实长度 如:一个汉字为两个字节 /// </summary> /// <param name="s"></param> /// <returns></returns> public static int LengthReal(this string s) { return Encoding.Default.GetBytes(s).Length; } #endregion #region 去除小数位最后为0的 /// <summary> /// 去除小数位最后为0的 /// </summary> /// <param name="t"></param> /// <returns></returns> public static decimal ClearDecimal0(this string t) { decimal d; if (decimal.TryParse(t, out d)) { return decimal.Parse(double.Parse(d.ToString("g")).ToString()); } return 0; } #endregion #region 进制转换 /// <summary> /// 16进制转二进制 /// </summary> /// <param name="t"></param> /// <returns></returns> public static string Change16To2(this string t) { String BinOne = string.Empty; String BinAll = string.Empty; char[] nums = t.ToCharArray(); for (int i = 0; i < nums.Length; i++) { string number = nums[i].ToString(); int num = Int32.Parse(number, System.Globalization.NumberStyles.HexNumber); BinOne = Convert.ToString(num, 2).PadLeft(4, '0'); BinAll = BinAll + BinOne; } return BinAll; } /// <summary> /// 二进制转十进制 /// </summary> /// <param name="t"></param> /// <returns></returns> public static Int64 Change2To10(this string t) { char[] arrc = t.ToCharArray(); Int64 all = 0, indexC = 1; for (int i = arrc.Length - 1; i >= 0; i--) { if (arrc[i] == '1') { all += indexC; } indexC = indexC * 2; } return all; } /// <summary> /// 二进制转换byte[]数组 /// </summary> /// <param name="s"></param> /// <returns></returns> public static byte[] Change2ToBytes(this string t) { List<byte> list = new List<byte>(); char[] arrc = t.ToCharArray(); byte n = 0; char c; int j = 0; //倒序获取位 for (int i = arrc.Length - 1; i >= 0; i--) { c = arrc[i]; if (c == '1') { n += Convert.ToByte(Math.Pow(2, j)); } j++; if (j % 8 == 0) { list.Add(n); j = 0; n = 0; } } //剩余最高位 if (n > 0) list.Add(n); byte[] arrb = new byte[list.Count]; int j1 = 0; //倒序 for (int i = list.Count - 1; i >= 0; i--) { arrb[j1] = list[i]; j1++; } return arrb; } /// <summary> /// 二进制转化为索引id数据,从右到左 /// </summary> /// <param name="t"></param> /// <returns></returns> public static int[] Change2ToIndex(this string t) { List<int> list = new List<int>(); char[] arrc = t.ToCharArray(); char c; int j = 0; //倒序获取位 for (int i = arrc.Length - 1; i >= 0; i--) { j++; c = arrc[i]; if (c == '1') { list.Add(j); } } return list.ToArray(); } #endregion #region html url编码 解码 /// <summary> /// Html Encode /// </summary> /// <param name="pStr"></param> /// <returns></returns> public static string HtmlEncode(this string t) { return HttpContext.Current.Server.HtmlEncode(t); } /// <summary> /// Html Decode /// </summary> /// <param name="pStr"></param> /// <returns></returns> public static string HtmlDecode(this string t) { return HttpContext.Current.Server.HtmlDecode(t); } /// <summary> /// URL Encode /// </summary> /// <param name="pStr"></param> /// <returns></returns> public static string URLEncode(this string t) { return HttpContext.Current.Server.UrlEncode(t); } /// <summary> /// URL Decode /// </summary> /// <param name="pStr"></param> /// <returns></returns> public static string URLDecode(this string t) { return HttpContext.Current.Server.UrlDecode(t); } #endregion #region 向客户端输出内容 /// <summary> /// 向客户端输出内容 /// </summary> /// <param name="t"></param> public static void Write(this string t) { HttpContext.Current.Response.Write(t); } /// <summary> /// 向客户端输出内容 /// </summary> /// <param name="t"></param> public static void WriteLine(this string t) { HttpContext.Current.Response.Write(t + "<br />"); } #endregion }
