c# - 在数字中查找特定数字

Question

我需要在数字中找到特定的数字。例如我有以下数字

156, 14, 28,34

我需要找出有多少个数字是 4。

Answer 1

您只需要一个简单的Linq:

string source = "156, 14, 28,34";

// 2 since there're two numbers - 14, 34 which contain 4 
int result = source
  .Split(',')
  .Count(number => number.Contains('4'));

如果给你一个数组int[]:

int[] source = new[] {156, 14, 28, 34};

// 2 since there're two numbers - 14, 34 which contain 4 
int result = source
  .Count(number => number.ToString().Contains('4'));