非常实用的C#字符串操作处理类StringHelper.cs

一个非常好的C#字符串操作处理类StringHelper.cs，具体内容如下

/// <summary> 
/// 类说明：Assistant 
/// 编 码 人：苏飞 
/// 联系方式：361983679  
/// 更新网站：http://www.sufeinet.com/thread-655-1-1.html 
/// </summary> 
using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Text.RegularExpressions; 
 
namespace DotNet.Utilities 
{ 
  /// <summary> 
  /// 字符串操作类 
  /// 1、GetStrArray(string str, char speater, bool toLower) 把字符串按照分隔符转换成 List 
  /// 2、GetStrArray(string str) 把字符串转 按照, 分割 换为数据 
  /// 3、GetArrayStr(List list, string speater) 把 List 按照分隔符组装成 string 
  /// 4、GetArrayStr(List list) 得到数组列表以逗号分隔的字符串 
  /// 5、GetArrayValueStr(Dictionary<int, int> list)得到数组列表以逗号分隔的字符串 
  /// 6、DelLastComma(string str)删除最后结尾的一个逗号 
  /// 7、DelLastChar(string str, string strchar)删除最后结尾的指定字符后的字符 
  /// 8、ToSBC(string input)转全角的函数(SBC case) 
  /// 9、ToDBC(string input)转半角的函数(SBC case) 
  /// 10、GetSubStringList(string o_str, char sepeater)把字符串按照指定分隔符装成 List 去除重复 
  /// 11、GetCleanStyle(string StrList, string SplitString)将字符串样式转换为纯字符串 
  /// 12、GetNewStyle(string StrList, string NewStyle, string SplitString, out string Error)将字符串转换为新样式 
  /// 13、SplitMulti(string str, string splitstr)分割字符串 
  /// 14、SqlSafeString(string String, bool IsDel) 
  /// </summary> 
  public class StringHelper 
  { 
    /// <summary> 
    /// 把字符串按照分隔符转换成 List 
    /// </summary> 
    /// <param name="str">源字符串</param> 
    /// <param name="speater">分隔符</param> 
    /// <param name="toLower">是否转换为小写</param> 
    /// <returns></returns> 
    public static List<string> GetStrArray(string str, char speater, bool toLower) 
    { 
      List<string> list = new List<string>(); 
      string[] ss = str.Split(speater); 
      foreach (string s in ss) 
      { 
        if (!string.IsNullOrEmpty(s) && s != speater.ToString()) 
        { 
          string strVal = s; 
          if (toLower) 
          { 
            strVal = s.ToLower(); 
          } 
          list.Add(strVal); 
        } 
      } 
      return list; 
    } 
    /// <summary> 
    /// 把字符串转 按照, 分割 换为数据 
    /// </summary> 
    /// <param name="str"></param> 
    /// <returns></returns> 
    public static string[] GetStrArray(string str) 
    { 
      return str.Split(new Char[] { ',' }); 
    } 
    /// <summary> 
    /// 把 List<string> 按照分隔符组装成 string 
    /// </summary> 
    /// <param name="list"></param> 
    /// <param name="speater"></param> 
    /// <returns></returns> 
    public static string GetArrayStr(List<string> list, string speater) 
    { 
      StringBuilder sb = new StringBuilder(); 
      for (int i = 0; i < list.Count; i++) 
      { 
        if (i == list.Count - 1) 
        { 
          sb.Append(list[i]); 
        } 
        else 
        { 
          sb.Append(list[i]); 
          sb.Append(speater); 
        } 
      } 
      return sb.ToString(); 
    } 
    /// <summary> 
    /// 得到数组列表以逗号分隔的字符串 
    /// </summary> 
    /// <param name="list"></param> 
    /// <returns></returns> 
    public static string GetArrayStr(List<int> list) 
    { 
      StringBuilder sb = new StringBuilder(); 
      for (int i = 0; i < list.Count; i++) 
      { 
        if (i == list.Count - 1) 
        { 
          sb.Append(list[i].ToString()); 
        } 
        else 
        { 
          sb.Append(list[i]); 
          sb.Append(","); 
        } 
      } 
      return sb.ToString(); 
    } 
    /// <summary> 
    /// 得到数组列表以逗号分隔的字符串 
    /// </summary> 
    /// <param name="list"></param> 
    /// <returns></returns> 
    public static string GetArrayValueStr(Dictionary<int, int> list) 
    { 
      StringBuilder sb = new StringBuilder(); 
      foreach (KeyValuePair<int, int> kvp in list) 
      { 
        sb.Append(kvp.Value + ","); 
      } 
      if (list.Count > 0) 
      { 
        return DelLastComma(sb.ToString()); 
      } 
      else 
      { 
        return ""; 
      } 
    } 
 
    #region 删除最后一个字符之后的字符 
 
    /// <summary> 
    /// 删除最后结尾的一个逗号 
    /// </summary> 
    public static string DelLastComma(string str) 
    { 
      return str.Substring(0, str.LastIndexOf(",")); 
    } 
 
    /// <summary> 
    /// 删除最后结尾的指定字符后的字符 
    /// </summary> 
    public static string DelLastChar(string str, string strchar) 
    { 
      return str.Substring(0, str.LastIndexOf(strchar)); 
    } 
 
    #endregion 
 
    /// <summary> 
    /// 转全角的函数(SBC case) 
    /// </summary> 
    /// <param name="input"></param> 
    /// <returns></returns> 
    public static string ToSBC(string input) 
    { 
      //半角转全角： 
      char[] c = input.ToCharArray(); 
      for (int i = 0; i < c.Length; i++) 
      { 
        if (c[i] == 32) 
        { 
          c[i] = (char)12288; 
          continue; 
        } 
        if (c[i] < 127) 
          c[i] = (char)(c[i] + 65248); 
      } 
      return new string(c); 
    } 
 
    /// <summary> 
    /// 转半角的函数(SBC case) 
    /// </summary> 
    /// <param name="input">输入</param> 
    /// <returns></returns> 
    public static string ToDBC(string input) 
    { 
      char[] c = input.ToCharArray(); 
      for (int i = 0; i < c.Length; i++) 
      { 
        if (c[i] == 12288) 
        { 
          c[i] = (char)32; 
          continue; 
        } 
        if (c[i] > 65280 && c[i] < 65375) 
          c[i] = (char)(c[i] - 65248); 
      } 
      return new string(c); 
    } 
 
    /// <summary> 
    /// 把字符串按照指定分隔符装成 List 去除重复 
    /// </summary> 
    /// <param name="o_str"></param> 
    /// <param name="sepeater"></param> 
    /// <returns></returns> 
    public static List<string> GetSubStringList(string o_str, char sepeater) 
    { 
      List<string> list = new List<string>(); 
      string[] ss = o_str.Split(sepeater); 
      foreach (string s in ss) 
      { 
        if (!string.IsNullOrEmpty(s) && s != sepeater.ToString()) 
        { 
          list.Add(s); 
        } 
      } 
      return list; 
    } 
 
 
    #region 将字符串样式转换为纯字符串 
    /// <summary> 
    /// 将字符串样式转换为纯字符串 
    /// </summary> 
    /// <param name="StrList"></param> 
    /// <param name="SplitString"></param> 
    /// <returns></returns> 
    public static string GetCleanStyle(string StrList, string SplitString) 
    { 
      string RetrunValue = ""; 
      //如果为空，返回空值 
      if (StrList == null) 
      { 
        RetrunValue = ""; 
      } 
      else 
      { 
        //返回去掉分隔符 
        string NewString = ""; 
        NewString = StrList.Replace(SplitString, ""); 
        RetrunValue = NewString; 
      } 
      return RetrunValue; 
    } 
    #endregion 
 
    #region 将字符串转换为新样式 
    /// <summary> 
    /// 将字符串转换为新样式 
    /// </summary> 
    /// <param name="StrList"></param> 
    /// <param name="NewStyle"></param> 
    /// <param name="SplitString"></param> 
    /// <param name="Error"></param> 
    /// <returns></returns> 
    public static string GetNewStyle(string StrList, string NewStyle, string SplitString, out string Error) 
    { 
      string ReturnValue = ""; 
      //如果输入空值，返回空，并给出错误提示 
      if (StrList == null) 
      { 
        ReturnValue = ""; 
        Error = "请输入需要划分格式的字符串"; 
      } 
      else 
      { 
        //检查传入的字符串长度和样式是否匹配,如果不匹配，则说明使用错误。给出错误信息并返回空值 
        int strListLength = StrList.Length; 
        int NewStyleLength = GetCleanStyle(NewStyle, SplitString).Length; 
        if (strListLength != NewStyleLength) 
        { 
          ReturnValue = ""; 
          Error = "样式格式的长度与输入的字符长度不符，请重新输入"; 
        } 
        else 
        { 
          //检查新样式中分隔符的位置 
          string Lengstr = ""; 
          for (int i = 0; i < NewStyle.Length; i++) 
          { 
            if (NewStyle.Substring(i, 1) == SplitString) 
            { 
              Lengstr = Lengstr + "," + i; 
            } 
          } 
          if (Lengstr != "") 
          { 
            Lengstr = Lengstr.Substring(1); 
          } 
          //将分隔符放在新样式中的位置 
          string[] str = Lengstr.Split(','); 
          foreach (string bb in str) 
          { 
            StrList = StrList.Insert(int.Parse(bb), SplitString); 
          } 
          //给出最后的结果 
          ReturnValue = StrList; 
          //因为是正常的输出，没有错误 
          Error = ""; 
        } 
      } 
      return ReturnValue; 
    } 
    #endregion 
 
    /// <summary> 
    /// 分割字符串 
    /// </summary> 
    /// <param name="str"></param> 
    /// <param name="splitstr"></param> 
    /// <returns></returns> 
    public static string[] SplitMulti(string str, string splitstr) 
    { 
      string[] strArray = null; 
      if ((str != null) && (str != "")) 
      { 
        strArray = new Regex(splitstr).Split(str); 
      } 
      return strArray; 
    } 
    public static string SqlSafeString(string String, bool IsDel) 
    { 
      if (IsDel) 
      { 
        String = String.Replace("'", ""); 
        String = String.Replace("\"", ""); 
        return String; 
      } 
      String = String.Replace("'", "'"); 
      String = String.Replace("\"", """); 
      return String; 
    } 
 
    #region 获取正确的Id，如果不是正整数，返回0 
    /// <summary> 
    /// 获取正确的Id，如果不是正整数，返回0 
    /// </summary> 
    /// <param name="_value"></param> 
    /// <returns>返回正确的整数ID，失败返回0</returns> 
    public static int StrToId(string _value) 
    { 
      if (IsNumberId(_value)) 
        return int.Parse(_value); 
      else 
        return 0; 
    } 
    #endregion 
    #region 检查一个字符串是否是纯数字构成的，一般用于查询字符串参数的有效性验证。 
    /// <summary> 
    /// 检查一个字符串是否是纯数字构成的，一般用于查询字符串参数的有效性验证。(0除外) 
    /// </summary> 
    /// <param name="_value">需验证的字符串。。</param> 
    /// <returns>是否合法的bool值。</returns> 
    public static bool IsNumberId(string _value) 
    { 
      return QuickValidate("^[1-9]*[0-9]*$", _value); 
    } 
    #endregion 
    #region 快速验证一个字符串是否符合指定的正则表达式。 
    /// <summary> 
    /// 快速验证一个字符串是否符合指定的正则表达式。 
    /// </summary> 
    /// <param name="_express">正则表达式的内容。</param> 
    /// <param name="_value">需验证的字符串。</param> 
    /// <returns>是否合法的bool值。</returns> 
    public static bool QuickValidate(string _express, string _value) 
    { 
      if (_value == null) return false; 
      Regex myRegex = new Regex(_express); 
      if (_value.Length == 0) 
      { 
        return false; 
      } 
      return myRegex.IsMatch(_value); 
    } 
    #endregion 
 
 
    #region 根据配置对指定字符串进行 MD5 加密 
    /// <summary> 
    /// 根据配置对指定字符串进行 MD5 加密 
    /// </summary> 
    /// <param name="s"></param> 
    /// <returns></returns> 
    public static string GetMD5(string s) 
    { 
      //md5加密 
      s = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5").ToString(); 
 
      return s.ToLower().Substring(8, 16); 
    } 
    #endregion 
 
    #region 得到字符串长度，一个汉字长度为2 
    /// <summary> 
    /// 得到字符串长度，一个汉字长度为2 
    /// </summary> 
    /// <param name="inputString">参数字符串</param> 
    /// <returns></returns> 
    public static int StrLength(string inputString) 
    { 
      System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding(); 
      int tempLen = 0; 
      byte[] s = ascii.GetBytes(inputString); 
      for (int i = 0; i < s.Length; i++) 
      { 
        if ((int)s[i] == 63) 
          tempLen += 2; 
        else 
          tempLen += 1; 
      } 
      return tempLen; 
    } 
    #endregion 
 
    #region 截取指定长度字符串 
    /// <summary> 
    /// 截取指定长度字符串 
    /// </summary> 
    /// <param name="inputString">要处理的字符串</param> 
    /// <param name="len">指定长度</param> 
    /// <returns>返回处理后的字符串</returns> 
    public static string ClipString(string inputString, int len) 
    { 
      bool isShowFix = false; 
      if (len % 2 == 1) 
      { 
        isShowFix = true; 
        len--; 
      } 
      System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding(); 
      int tempLen = 0; 
      string tempString = ""; 
      byte[] s = ascii.GetBytes(inputString); 
      for (int i = 0; i < s.Length; i++) 
      { 
        if ((int)s[i] == 63) 
          tempLen += 2; 
        else 
          tempLen += 1; 
 
        try 
        { 
          tempString += inputString.Substring(i, 1); 
        } 
        catch 
        { 
          break; 
        } 
 
        if (tempLen > len) 
          break; 
      } 
 
      byte[] mybyte = System.Text.Encoding.Default.GetBytes(inputString); 
      if (isShowFix && mybyte.Length > len) 
        tempString += "…"; 
      return tempString; 
    } 
    #endregion 
 
 
 
    #region HTML转行成TEXT 
    /// <summary> 
    /// HTML转行成TEXT 
    /// </summary> 
    /// <param name="strHtml"></param> 
    /// <returns></returns> 
    public static string HtmlToTxt(string strHtml) 
    { 
      string[] aryReg ={ 
      @"<script[^>]*?>.*?</script>", 
      @"<(\/\s*)?!?((\w+:)?\w+)(\w+(\s*=?\s*(([""'])(\\[""'tbnr]|[^\7])*?\7|\w+)|.{0})|\s)*?(\/\s*)?>", 
      @"([\r\n])[\s]+", 
      @"&(quot|#34);", 
      @"&(amp|#38);", 
      @"&(lt|#60);", 
      @"&(gt|#62);",  
      @"&(nbsp|#160);",  
      @"&(iexcl|#161);", 
      @"&(cent|#162);", 
      @"&(pound|#163);", 
      @"&(copy|#169);", 
      @"&#(\d+);", 
      @"-->", 
      @"<!--.*\n" 
      }; 
 
      string newReg = aryReg[0]; 
      string strOutput = strHtml; 
      for (int i = 0; i < aryReg.Length; i++) 
      { 
        Regex regex = new Regex(aryReg[i], RegexOptions.IgnoreCase); 
        strOutput = regex.Replace(strOutput, string.Empty); 
      } 
 
      strOutput.Replace("<", ""); 
      strOutput.Replace(">", ""); 
      strOutput.Replace("\r\n", ""); 
 
 
      return strOutput; 
    } 
    #endregion 
 
    #region 判断对象是否为空 
    /// <summary> 
    /// 判断对象是否为空，为空返回true 
    /// </summary> 
    /// <typeparam name="T">要验证的对象的类型</typeparam> 
    /// <param name="data">要验证的对象</param>     
    public static bool IsNullOrEmpty<T>(T data) 
    { 
      //如果为null 
      if (data == null) 
      { 
        return true; 
      } 
 
      //如果为"" 
      if (data.GetType() == typeof(String)) 
      { 
        if (string.IsNullOrEmpty(data.ToString().Trim())) 
        { 
          return true; 
        } 
      } 
 
      //如果为DBNull 
      if (data.GetType() == typeof(DBNull)) 
      { 
        return true; 
      } 
 
      //不为空 
      return false; 
    } 
 
    /// <summary> 
    /// 判断对象是否为空，为空返回true 
    /// </summary> 
    /// <param name="data">要验证的对象</param> 
    public static bool IsNullOrEmpty(object data) 
    { 
      //如果为null 
      if (data == null) 
      { 
        return true; 
      } 
 
      //如果为"" 
      if (data.GetType() == typeof(String)) 
      { 
        if (string.IsNullOrEmpty(data.ToString().Trim())) 
        { 
          return true; 
        } 
      } 
 
      //如果为DBNull 
      if (data.GetType() == typeof(DBNull)) 
      { 
        return true; 
      } 
 
      //不为空 
      return false; 
    } 
    #endregion 
  } 
}

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