定义无固定大小双数组？ [英] Define a double array without a fixed size?

问题描述

您好我有C＃数组的一个问题。我需要一个数组来的一些数据存储在那里...
我的code是

Hello i have a problem with c# Arrays. I need a array to store some data in there... My Code is that

double[] ATmittelMin;
ATmittelMin[zaehlMittel] = Gradient(x, xATmax, y, yATmax);

但是，编译器说：没有定义VAR
我如何定义没有一个固定大小的双数组？
非常感谢！

But the compiler says: not defined var How can i define a double array without a fixed size ? Thanks a lot!

推荐答案

数组总是固定的大小，并已到，像这样定义：

Arrays are always fixed in size, and have to be defined like so:

double[] items1 = new double[10];

// This means array is double[3] and cannot be changed without redefining it.
double[] items2 = {1.23, 4.56, 7.89};

的列表＆LT; T＆GT; 类使用数组在后台，当它运行的空间，重新定义它：

The List<T> class uses an array in the background and redefines it when it runs out of space:

List<double> items = new List<double>();
items.Add(1.23);
items.Add(4.56);
items.Add(7.89);

// This will give you a double[3] array with the items of the list.
double[] itemsArray = items.ToArray();

您可以通过迭代一个列表＆LT; T＆GT; 就像你将一个数组：

You can iterate through a List<T> just as you would an array:

foreach (double item in items)
{
    Console.WriteLine(item);
}

// Note that the property is 'Count' rather than 'Length'
for (int i = 0; i < items.Count; i++)
{
    Console.WriteLine(items[i]);
}

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