C＃。如何编写可以在字符串中搜索char并返回出现次数的函数？ [英] C#. How do I write a function that can search a char within a string and return the number of occurrences?

问题描述

嗨！我需要一个函数来搜索字符串并查找给定字符串中给定char的出现次数。你能帮我吗 ？谢谢。



我在下面尝试了这个代码，它只是给出了字符串中的所有字符..而且我的老师说这太复杂了我需要简化它。也许我应该定义一个字符串和一个字符并使用if else语句..我想不出其他的东西..所以请欢迎任何想法。



对不起，如果你不太了解英语是我的第二语言，我试着尽可能清楚地表达自己。



我尝试了什么：

  namespace  ConsoleApplication5 
 {
  class  ex3 
 {
  static   void  Main（ string  [] args）
 {
  string  str =   aabb12cc< /跨度>; 
  var  count = CharacterCount.Count（str）; 
  foreach （ var 字符  count）
 {
 Console.WriteLine（  {0}  -  {1}，character.Key，character.Value）; 
} 
} 
 
} 
  class  CharacterCount 
 {
  public   static  SortedDictionary< char， int  =   > 计数（ string  stringToCount）
 {
 SortedDictionary< char， int  =   >  characterCount =  new  SortedDictionary< char， int  =    > （）; 
  foreach （ var 字符  stringToCount）
 {
  int  counter =  0 ; 
 characterCount.TryGetValue（character， out  counter）; 
 characterCount [character] = counter +  1 ; 
} 
  return  characterCount; 
} 
} 
} 

解决方案

可以简化代码的第一件事就是字符串是一个字符数组。例如，尝试使用以下代码：

  string  str =   aabb12cc; 
 Console.WriteLine（str [ 3 ]）; 

话虽如此，你可以拥有循环遍历所有字符的单个循环，如果需要字符，则将计数器递增1。一个简单的循环可以是 for（C＃Reference） [ ^ ]循环从0开始并在字符串结尾处结束。

Hi! I need a function who searches a string and find the number of occurrences of a given char within this given string. Can you help ? thank you.

I have tried this code below and it just gives all the chars within the string .. and my teacher said it was too complicated and I need to simplified it. And maybe I should define a string and a char and use a if else statement .. and I can't think of something else .. so please any ideas will be welcomed.

Sorry if you don't understand it well enough English is my second language and I tried to express myself as clearly as I can.

What I have tried:

namespace ConsoleApplication5
{
    class ex3
    {
        static void Main(string[] args)
        {
            string str = "aabb12cc";
            var count = CharacterCount.Count(str);
            foreach (var character in count)
            {
                Console.WriteLine("{0}-{1}", character.Key, character.Value);
            }
        }

    }
    class CharacterCount
    {
        public static SortedDictionary<char, int=""> Count(string stringToCount)
        {
            SortedDictionary<char, int=""> characterCount = new SortedDictionary<char, int="">();
            foreach (var character in stringToCount)
            {
                int counter = 0;
                characterCount.TryGetValue(character, out counter);
                characterCount[character] = counter + 1;
            }
            return characterCount;
        }
    }
}

解决方案

First thing that could simplify your code is the fact that the string is an array of chars. For example try what happens with the following code

string str = "aabb12cc";
Console.WriteLine(str[3]);

Having that said, you could have a single loop looping through all the characters and if the character is desired one, then increment the counter by one. A simple loop could be a for (C# Reference)[^] loop starting from 0 and ending at the end of the string.

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