一个非常好的C#字符串操作处理类StringHelper.cs

 /// <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*)?>",  
            @"([
])[s]+",  
            @"&(quot|#34);",  
            @"&(amp|#38);",  
            @"&(lt|#60);",  
            @"&(gt|#62);",   
            @"&(nbsp|#160);",   
            @"&(iexcl|#161);",  
            @"&(cent|#162);",  
            @"&(pound|#163);",  
            @"&(copy|#169);",  
            @"&#(d+);",  
            @"-->",  
            @"<!--.*
"  
            };  
  
            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("
", "");  
  
  
            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  
    }  
}