c#拆分字符串英文和数字（包括国外所以文字）

先创建一个类：

 /// <summary>
    /// 字符串分析
    /// </summary>
    interface IStringAna
    {
        /// <summary>
        /// key:文本包含的汉字或英文单词，value:汉字或英文单词出现的次数
        /// </summary>
        /// <param name="text"></param>
        /// <returns>key:文本包含的汉字或英文单词，value:汉字或英文单词出现的次数</returns>
        Dictionary<string, int> Ana(string text);
    }

    class StringAna : IStringAna
    {
        public Dictionary<string, int> Ana(string text)
        {
            var words = new List<string>();
            var dict = new Dictionary<string, int>();
            byte[] bts = Encoding.Unicode.GetBytes(text);
            //foreach (var bt in bts)
            //{
            //    Console.Write(string.Format("{0} ",bt));
            //}
            //Console.WriteLine();
            var pointer = ;
            var i = ;
            while (i <= bts.Length-)
            {
                byte[] tmp;

                if (bts[i + ] ==  && bts[i] != )
                {
                    pointer = i;
                    while (pointer +  < bts.Length && bts[pointer +] !=  && bts[pointer + +] == )
                    {
                        pointer += ;
                    }
                    var len = pointer+ - i;
                    tmp = new byte[len];
                    Array.Copy(bts, i, tmp, , len);
                    i = pointer+;
                }
                else if (bts[i] ==  && bts[i + ] == )
                {
                    i += ;
                    continue;
                }
                else
                {
                    tmp = new byte[] { bts[i], bts[i + ] };
                    i += ;
                }
                var word = Bytes2Word(tmp);
                words.Add(word);
                Put(dict, Bytes2Word(tmp));
            }
            return dict;
        }

        string Bytes2Word(byte[] bytes)
        {
            return Encoding.Unicode.GetString(bytes);
        }

        void Put(Dictionary<string,int> dict,string word)
        {
            int value;
            if(dict.TryGetValue(word,out value))
            {
                dict[word] = value + ;
            }
            else
            {
                dict[word] = ;
            }

        }
    }

实现接口：

     var text = GetTestText();//生成测试文本
            Console.WriteLine(text);
            IStringAna ana = new StringAna();
            var sp = Stopwatch.StartNew();
            var rlt = ana.Ana(text);
            Console.WriteLine($"Elapsed:{sp.ElapsedTicks}");
            if (rlt == null)
            {
                Console.WriteLine("error");
            }
            else
            {
                foreach(var item in rlt)
                {
                    Console.WriteLine($"{item.Key}:{item.Value}");
                }