Question

用c#在屏幕上输入一个字符串，求每个字符串出现的次数

Answer 1

ing System;using System.Collections.Generic;using System.Linq;using System.Text;
namespace Demo{ class Program { static void Main(string[] args) { string motherString = "qwertyuiopasdfghjklqwezxcqwevbnqwem"; string childString = "qwe"; var num = Count(motherString,childString); Console.WriteLine("{0}含有的{1}个数为:{2}",motherString,childString,num); Console.Read(); } static int Count(string WithinString, string search) { if (string.IsNullOrEmpty(search)) throw new ArgumentNullException("search"); int counter = 0; int index = WithinString.IndexOf(search, 0); while (index >= 0 && index < WithinString.Length) { counter++; index = WithinString.IndexOf(search, index + search.Length); } return counter; }//这是一个方法，WithinString字符串，search你想查看个数的字符串，counter返回个数 }}