在C#中声明不知道其大小的2D数组 [英] Declaring a 2D array without knowing its size in C#
问题描述
我想使用2-D数组,但我无法提前知道它的大小.所以我的问题是:如何声明它?然后如何向其中添加值?
I would like to use a 2-D array but I can't know its size in advance. So my question is: how to declare it? And then how to add values into it?
String[,] tabConfig = new String[?, 4];
foreach(blabla with i)
{
tabConfig[i, 0] = a;
tabConfig[i, 1] = b;
tabConfig[i, 2] = c;
tabConfig[i, 3] = d;
}
我知道我也可以使用列表,但我对此并不十分熟悉.
I know I can also use a list but I am not very familiar with it.
谢谢!
振作起来!在乔恩·斯凯特(Jon Skeet)的帮助下,这是我真正的代码!
Brace yourselves! Here come my true code with Jon Skeet's help!
List<string[]> tabConfig = new List<string[]>();
String[] temp = new String[4];//The array that will be inside the List
int line = 0, column = 0;
foreach (XmlNode e in doc.DocumentElement.ChildNodes)
{
if (e.Attributes["Server"].Value == choice)
{
temp[0] = e.Attributes["Serveur"].Value;//Here is value 'a'
column = 1;
foreach (XmlNode i in e.ChildNodes)
{
temp[colonne] = i.InnerText;//Here are values 'b', 'c' and 'd'
column++;
}
tabConfig.Add(temp);//Put a new line into the List
line++;
}
}
并称之为:
foreach(string[] array in tabConfig)
foreach(String txt in array)
Console.WriteLine(txt);
推荐答案
所以我的问题是:如何声明它?
So my question is: how to declare it?
不能..NET中的所有数组都是固定大小的:您无法在不知道大小的情况下创建数组实例.
You can't. All arrays in .NET are fixed size: you can't create an array instance without knowing the size.
在我看来,您应该有一个 List< T>
-并且我实际上将创建一个类来保存这四个属性,而不仅仅是使用数组的四个元素.您可以使用数组列表:
It looks to me like you should have a List<T>
- and I'd actually create a class to hold the four properties, rather than just using four elements of an array, probably. You could use a list of arrays:
List<string[]> tabConfig = new List<string[]>();
foreach (...)
{
tabConfig.Add(new string[] { a, b, c, d });
}
...但是您需要了解这四个元素在排序等方面的含义,这可能会使其余代码难以理解.
... but then you need to know what those four elements mean in terms of ordering etc, which is likely to make the rest of your code harder to understand.
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