【c#】c#常用小技巧方法整理（5）—— 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)
代码如下：
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);elsereturn 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;elsetempLen += 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;elsetempLen += 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nullif (data == null){return true;}//如果为""if (data.GetType() == typeof(String)){if (string.IsNullOrEmpty(data.ToString().Trim())){return true;}}//如果为DBNullif (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nullif (data == null){return true;}//如果为""if (data.GetType() == typeof(String)){if (string.IsNullOrEmpty(data.ToString().Trim())){return true;}}//如果为DBNullif (data.GetType() == typeof(DBNull)){return true;}//不为空return false;}#endregion}