字符串对比

工作中用到一个字符串排序,类似于windows中文件夹的排序,本来也没有什么,排序用冒泡算法就行了。

不过字符串对比,没有找到系统自带的方法,只好自己写一个。

排序采用Asciid码表,例如1与a,则a是大的;

同样字符的话,取长度最大的,例如aa与aaa,取aaa为大;如果是aab与aaa,自然是aab为最大;

/// <summary>
        /// 比较两个字符串的大值(按ascii)
        /// </summary>
        /// <param name="s1"></param>
        /// <param name="s2"></param>
        /// <returns></returns>
        private static string maxString(string s1, string s2)
        {
            //一些非空判断
            if (string.IsNullOrWhiteSpace(s1)) return s2;
            if (string.IsNullOrWhiteSpace(s2)) return s1;
            if (s1.Trim() == "") return s2;
            if (s2.Trim() == "") return s1;
            //对比
            int minlen = s1.Length < s2.Length ? s1.Length : s2.Length;
            char[] c1 = s1.ToCharArray();
            char[] c2 = s2.ToCharArray();
            char[] max = null;
            for (int i = 0; i < minlen; i++)
            {
                if (c1[i] != c2[i])
                {
                    max = c1[i] > c2[i] ? c1 : c2;
                    break;
                }
            }
            if (max == null) max = c1.Length > c2.Length ? c1 : c2;          
            return new string(max);
        }
        /// <summary>
        /// 比较两个字符串的小值(按ascii)
        /// </summary>
        /// <param name="s1"></param>
        /// <param name="s2"></param>
        /// <returns></returns>
        private static string minString(string s1, string s2)
        {
            //一些非空判断
            if (string.IsNullOrWhiteSpace(s1)) return s2;
            if (string.IsNullOrWhiteSpace(s2)) return s1;
            if (s1.Trim() == "") return s2;
            if (s2.Trim() == "") return s1;
            //对比
            int minlen = s1.Length < s2.Length ? s1.Length : s2.Length;
            char[] c1 = s1.ToCharArray();
            char[] c2 = s2.ToCharArray();
            char[] min = null;
            for (int i = 0; i < minlen; i++)
            {
                if (c1[i] != c2[i])
                {
                    min = c1[i] < c2[i] ? c1 : c2;
                    break;
                }
            }
            if (min == null) min = c1.Length < c2.Length ? c1 : c2;
            return new string(min);
        }

 

posted @ 2016-03-18 17:51  songsoft  阅读(1809)  评论(0编辑  收藏  举报