查找多个索引数组 [英] Find multiple index in array

问题描述

说我有一个这样的数组

  string [] fruits = {"watermelon","apple","apple","kiwi","pear","banana"};

是否有一个内置的功能，让我查询苹果的所有指标？ 例如，

Is there an built in function that allows me to query all the index of "apple" ? For example,

  fruits.FindAllIndex("apple"); 

将返回图1和2的阵列

will return an array of 1 and 2

如果没有的话，我应该怎么实现呢？

If there is not, how should I implement it?

谢谢！

推荐答案

一种方法是这样写：

var indices = fruits
                .Select ((f, i) => new {f, i})
                .Where (x => x.f == "apple")
                .Select (x => x.i);

还是以传统的方式：

Or the traditional way:

var indices = new List<int>();
for (int i = 0; i < fruits.Length; i++)
    if(fruits[i] == "apple")
        indices.Add(i);

这篇关于查找多个索引数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！