asp.net找出字符串存在最多的字符与数量

有一道题比较经典: String str="fdsahkdfsughnudfshguhdsughdisufghssjdjfg";
找出str存在最多的字符与数量

引用
using System.Text.RegularExpression;

得到结果
int getnum=Regex.Matches(sr.ToString(),"A").Count

String str = "fdsahkdfsughnudfshguhdsughdisufghssjdjfg"; char mostChar = str[0]; int mostCount = str.Split(mostChar).Length; for (int i = 1; i < str.Length; i++) { int cnt = str.Split(str[i]).Length; if (cnt > mostCount) { mostChar = str[i]; mostCount = cnt; } } Console.WriteLine("最多的字符是 {0} : 数目是{1}", mostChar, mostCount);