C＃数组，如何创建空数组？ [英] C# arrays, how to create empty array?

问题描述

我学习C＃中，我的小学语文现在正在PHP之前。我想知道你如何（或者）C＃创建一个空数组。

I'm learning c#, with my primary language before now being php. I was wondering how (or if) you could create an empty array in c#.

在PHP中，你可以创建一个数组，然后添加任意数量的条目吧。

In php, you can create an array, and then add any number of entries to it.

$multiples=array();
$multiples[] = 1;
$multiples[] = 2;
$multiples[] = 3;

在C＃中，我无法做类似的事情：

In c#, I'm having trouble doing something similar:

int[] arraynums = new int[];
arraynums[] = 1;
arraynums[] = 2;
arraynums[] = 3;

这给错误数组创建必须有数组大小或数组初始化程序。如果我不知道我要多少个条目做，我该怎么办呢？有没有办法解决？

Which gives the error "array creation must have array size or array initializer." If I don't know how many entries I want to make, how do I do this? Is there a way around this?

推荐答案

如果你不事先知道的大小，使用列表＆LT;的而不是; T＆GT数组。一个数组，在C＃中的大小是固定的，你在创建时必须指定大小。

If you don't know the size in advance, use a List<T> instead of an array. An array, in C#, is a fixed size, and you must specify the size when creating it.

var arrayNums = new List<int>();
arrayNums.Add(1);
arrayNums.Add(2);

一旦你添加的项目，您可以通过索引提取它们，就像你会与一个数组：

Once you've added items, you can extract them by index, just like you would with an array:

int secondNumber = arrayNums[1];

这篇关于C＃数组，如何创建空数组？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！