网站字符串操作类代码,Asp.Net代码库,德仔网

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【Asp.Net】网站字符串操作类
作者:brainmao / 发布于2014/6/26/ 417

	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.Text.RegularExpressions;
	
	namespace Core.Common.Web
	{
	 /// <summary>
	 /// 网站字符串操作类
	 /// </summary>
	 public static class String
	 {
	 #region 静态方法
	
	 /// <summary>
	 /// 左截取
	 /// </summary>
	 /// <param name="inputString">字符串</param>
	 /// <param name="length">长度</param>
	 /// <returns>截取后的字符串</returns>
	 public static string Left(string inputString, int length)
	 {
	 if (inputString.Length < length)
	 return inputString;
	 else
	 return inputString.Substring(0, length);
	 }
	
	 /// <summary>
	 /// 左截取
	 /// </summary>
	 /// <param name="inputString">字符串</param>
	 /// <param name="length">长度</param>
	 /// <param name="addString">截取后添加的字符串</param>
	 /// <returns>截取后的字符串</returns>
	 public static string Left(string inputString, int length, string addString)
	 {
	 if (inputString.Length < length)
	 return inputString;
	 else
	 return inputString.Substring(0, length) + addString;
	 }
	
	 /// <summary>
	 /// 右截取
	 /// </summary>
	 /// <param name="inputString">字符串</param>
	 /// <param name="length">长度</param>
	 /// <returns>截取后的字符串</returns>
	 public static string Right(string inputString, int length)
	 {
	 if (inputString.Length < length)
	 return inputString;
	 else
	 return inputString.Substring(inputString.Length - length, length);
	 }
	
	 /// <summary>
	 /// 不区分大小写的替换
	 /// </summary>
	 /// <param name="original">原字符串</param>
	 /// <param name="pattern">需替换字符</param>
	 /// <param name="replacement">被替换内容</param>
	 /// <returns>替换后的字符串</returns>
	 public static string ReplaceEx(string original, string pattern, string replacement)
	 {
	 int count = 0;
	 int position0 = 0;
	 int position1 = 0;
	 string upperString = original.ToUpper();
	 string upperPattern = pattern.ToUpper();
	 int inc = (original.Length / pattern.Length) * (replacement.Length - pattern.Length);
	 char[] chars = new char[original.Length + Math.Max(0, inc)];
	 while ((position1 = upperString.IndexOf(upperPattern, position0)) != -1)
	 {
	 for (int i = position0; i < position1; ++i) chars[count++] = original[i];
	 for (int i = 0; i < replacement.Length; ++i) chars[count++] = replacement[i];
	 position0 = position1 + pattern.Length;
	 }
	 if (position0 == 0) return original;
	 for (int i = position0; i < original.Length; ++i) chars[count++] = original[i];
	 return new string(chars, 0, count);
	 }
	
	 /// <summary>
	 /// 替换html中的特殊字符
	 /// </summary>
	 /// <param name="theString">需要进行替换的文本</param>
	 /// <returns>替换完的文本</returns>
	 public static string HtmlEncode(string theString)
	 {
	 theString = theString.Replace(">", ">");
	 theString = theString.Replace("<", "<");
	 theString = theString.Replace(" ", " ");
	 theString = theString.Replace("\"", """);
	 theString = theString.Replace("'", "'");
	 theString = theString.Replace("\r\n", "<br/> ");
	 return theString;
	 }
	
	 /// <summary>
	 /// 恢复html中的特殊字符
	 /// </summary>
	 /// <param name="theString">需要恢复的文本。</param>
	 /// <returns>恢复好的文本。</returns>
	 public static string HtmlDecode(string theString)
	 {
	 theString = theString.Replace(">", ">");
	 theString = theString.Replace("<", "<");
	 theString = theString.Replace(" ", " ");
	 theString = theString.Replace(""", "\"");
	 theString = theString.Replace("'", "'");
	 theString = theString.Replace("<br/> ", "\r\n");
	 return theString;
	 }
	
	 /// <summary>
	 /// 将html转成js代码,不完全和原始数据一致
	 /// </summary>
	 /// <param name="source">html文本</param>
	 /// <returns>js代码</returns>
	 public static string HtmlToJs(string source)
	 {
	 return string.Format("document.write(\"{0}\");",
	 string.Join("\");\r\ndocument.write(\"", source.Replace("\\", "\\\\")
	 .Replace("/", "\\/")
	 .Replace("'", "\\'")
	 .Replace("\"", "\\\"")
	 .Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries)
	 ));
	 }
	
	 /// <summary>
	 /// 将html转成可输出的js字符串,不完全和原始数据一致
	 /// </summary>
	 /// <param name="source">html文本</param>
	 /// <returns>js文本</returns>
	 public static string HtmlToJsString(string source)
	 {
	 return string.Format("{0}",
	 string.Join(" ", source.Replace("\\", "\\\\")
	 .Replace("/", "\\/")
	 .Replace("'", "\\'")
	 .Replace("\"", "\\\"")
	 .Replace("\t", "")
	 .Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries)
	 ));
	 }
	
	 /// <summary>
	 /// 过滤所有特殊特号
	 /// </summary>
	 /// <param name="theString">需过滤的字符串</param>
	 /// <returns>过滤后的字符串</returns>
	 public static string FilterSymbol(string theString)
	 {
	 string[] aryReg = { "'", "\"", "\r", "\n", "<", ">", "%", "?", ",", ".", "=", "-", "_", ";", "|", "[", "]", "&", "/" };
	 for (int i = 0; i < aryReg.Length; i++)
	 {
	 theString = theString.Replace(aryReg[i], string.Empty);
	 }
	 return theString;
	 }
	
	 /// <summary>
	 /// 过滤一般特殊特号,如单引、双引和回车和分号等
	 /// </summary>
	 /// <param name="theString">需过滤的字符串</param>
	 /// <returns>过滤后的字符串</returns>
	 public static string SafetyString(string theString)
	 {
	 string[] aryReg = { "'", ";", "\"", "\r", "\n", "<", ">" };
	 for (int i = 0; i < aryReg.Length; i++)
	 {
	 theString = theString.Replace(aryReg[i], string.Empty);
	 }
	 return theString;
	 }
	
	 /// <summary>
	 /// 正则表达式取值
	 /// </summary>
	 /// <param name="htmlCode">HTML代码</param>
	 /// <param name="regexString">正则表达式</param>
	 /// <param name="groupKey">正则表达式分组关键字</param>
	 /// <param name="rightToLeft">是否从右到左</param>
	 /// <returns>匹配的值</returns>
	 public static string[] GetRegexValue(string htmlCode, string regexString, string groupKey, bool rightToLeft)
	 {
	 MatchCollection m;
	 Regex r;
	 if (rightToLeft == true)
	 {
	 r = new Regex(regexString, RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.RightToLeft);
	 }
	 else
	 {
	 r = new Regex(regexString, RegexOptions.IgnoreCase | RegexOptions.Singleline);
	 }
	 m = r.Matches(htmlCode);
	 string[] MatchValue = new string[m.Count];
	 for (int i = 0; i < m.Count; i++)
	 {
	 MatchValue[i] = m[i].Groups[groupKey].Value;
	 }
	 return MatchValue;
	 }
	
	 #endregion
	 }
	}
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