在"foreach"循环中获取阵列键 [英] Getting the array key in a 'foreach' loop

问题描述

如何在C#的foreach循环中获取当前元素的键?

How do I get the key of the current element in a foreach loop in C#?

例如:

foreach ($array as $key => $value)
{
    echo("$value is assigned to key: $key");
}

我想在C#中做什么:

int[] values = { 5, 14, 29, 49, 99, 150, 999 };

foreach (int val in values)
{
    if(search <= val && !stop)
    {
         // Set key to a variable
    }
}

推荐答案

Grauenwolf's way is the most straightforward and performant way of doing this with an array:

要么使用for循环，要么创建一个在每次通过时递增的临时变量.

Either use a for loop or create a temp variable that you increment on each pass.

当然会是这样的:

int[] values = { 5, 14, 29, 49, 99, 150, 999 };

for (int key = 0; key < values.Length; ++key)
  if (search <= values[key] && !stop)
  {
    // set key to a variable
  }

使用.NET 3.5，您还可以采用一种更具功能性的方法，但是该方法在站点上更加冗长，并且可能依赖于几个

With .NET 3.5 you can take a more functional approach as well, but it is a little more verbose at the site, and would likely rely on a couple support functions for visiting the elements in an IEnumerable. Overkill if this is all you need it for, but handy if you tend to do a lot of collection processing.

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