使用 LINQ 在一行代码中将 string[] 转换为 int[]

问题描述：

我有一个字符串形式的整数数组:

I have an array of integers in string form:

var arr = new string[] { "1", "2", "3", "4" };

我需要一个真实"整数数组来进一步推动它:

I need to an array of 'real' integers to push it further:

void Foo(int[] arr) { .. }

我尝试转换 int 并且它当然失败了:

I tried to cast int and it of course failed:

Foo(arr.Cast<int>.ToArray());

接下来我可以做:

var list = new List<int>(arr.Length);
arr.ForEach(i => list.Add(Int32.Parse(i))); // maybe Convert.ToInt32() is better?
Foo(list.ToArray());

或

var list = new List<int>(arr.Length);
arr.ForEach(i =>
{
   int j;
   if (Int32.TryParse(i, out j)) // TryParse is faster, yeah
   {
      list.Add(j);
   }
 }
 Foo(list.ToArray());

但两者都看起来很丑.

还有其他方法可以完成任务吗?

Is there any other ways to complete the task?

答

给定一个数组，您可以使用 Array.ConvertAll 方法:

Given an array you can use the Array.ConvertAll method:

int[] myInts = Array.ConvertAll(arr, s => int.Parse(s));

感谢 Marc Gravell 指出可以省略 lambda，从而生成如下所示的较短版本:

Thanks to Marc Gravell for pointing out that the lambda can be omitted, yielding a shorter version shown below:

int[] myInts = Array.ConvertAll(arr, int.Parse);

LINQ 解决方案类似，只是您需要额外的 ToArray 调用来获取数组:

A LINQ solution is similar, except you would need the extra ToArray call to get an array:

int[] myInts = arr.Select(int.Parse).ToArray();

使用 LINQ 在一行代码中将 string[] 转换为 int[]

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