<经验杂谈>C#/.Net字符串操作方法小结

字符串操作是C#中最基本的、最常见的、也是用的最多的，以下我总结 了几种常见的方法

1.把字符串按照分隔符转换成 List  

        /// <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)
        {
            var list = new List<string>();
            var ss = str.Split(speater);
            foreach (var s in ss)
            {
                if (string.IsNullOrWhiteSpace(s) || s == speater.ToString(CultureInfo.InvariantCulture)) continue;
                var strVal = s;
                if (toLower)
                {
                    strVal = s.ToLower();
                }
                list.Add(strVal);
            }
            return list;
        }

2.把字符串转 按照, 分割 换为数据  

        /// <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[] { ',', '，' });
        }

3.得到数组列表以逗号分隔的字符串

        /// <summary>
        /// 得到数组列表以逗号分隔的字符串
        /// </summary>
        /// <param name="list"></param>
        /// <param name="speater"></param>
        /// <returns></returns>
        public static string GetArrayStr(List<string> list, string speater)
        {
            var sb = new StringBuilder();
            for (var 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();
        }

4.得到字符串长度

        /// <summary>
        /// 得到字符串长度
        /// </summary>
        /// <param name="inputStr"></param>
        /// <returns></returns>
        public static int StrLength(string inputStr)
        {
            var asc = new ASCIIEncoding();
            var s = asc.GetBytes(inputStr);
            return s.Sum(t => t == 63 ? 2 : 1);
        }

5.截取指定长度字符串

        /// <summary>
        /// 截取指定长度字符串
        /// </summary>
        /// <param name="inputString"></param>
        /// <param name="len"></param>
        /// <returns></returns>
        public static string CutStr(string inputString, int len)
        {
            var isShowFix = false;
            if (len % 2 == 1)
            {
                isShowFix = true;
                len--;
            }
            var ascii = new ASCIIEncoding();
            var tempLen = 0;
            var tempString = "";
            var s = ascii.GetBytes(inputString);
            for (var i = 0; i < s.Length; i++)
            {
                tempLen += s[i] == 63 ? 2 : 1;
                try
                {
                    tempString += inputString.Substring(i, 1);
                }
                catch
                {
                    break;
                }

                if (tempLen > len)
                    break;
            }

            var mybyte = Encoding.Default.GetBytes(inputString);
            if (isShowFix && mybyte.Length > len)
                tempString += "…";
            return tempString; 
        }

暂时就这五种方法了。