blocks|key|1400587|text|必须为数组指定长度。要允许任意数量的元素，请使用List类。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1400588|例如：|1400589|List<int>+myInts+=+new+List<int>();
myInts.Add(5);
myInts.Add(10);
myInts.Add(11);
myInts.Count+//+=+3|code-block|syntax|javascript|1400590|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx^0|O|4|O|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Arrays must be assigned a length. To allow for any number of elements, use the <a href="http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx" rel="noreferrer"><code>List</code></a> class.

For example:

<pre><code>List&lt;int&gt; myInts = new List&lt;int&gt;();
myInts.Add(5);
myInts.Add(10);
myInts.Add(11);
myInts.Count // = 3
</code></pre>

blocks|key|1400749|text|使用List<>构建一个长度未知的“数组”。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1400750|使用List<>.ToArray()返回实数组，而不是List。|1400751|var+list+=+new+List<int>();
list.Add(1);
list.Add(2);
list.Add(3);
var+array+=+list.ToArray();|code-block|syntax|javascript|1400752|entityMap^0|2|6|0|2|G|R|4|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

Use <code>List&lt;&gt;</code> to build up an 'array' of unknown length.

Use <code>List&lt;&gt;.ToArray()</code> to return a real array, and not a <code>List</code>.

<pre><code>var list = new List&lt;int&gt;();
list.Add(1);
list.Add(2);
list.Add(3);
var array = list.ToArray();
</code></pre>

blocks|key|1615374|text|您可以创建一个大小设置为变量的数组，即|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1615375|int+size+=+50;
string[]+words+=+new+string[size];+//+contains+50+strings|code-block|syntax|javascript|1615376|然而，如果你决定需要100个单词，这个大小以后就不能改变了。如果您需要真正动态的大小，则需要使用不同类型的数据结构。试试List。|offset|length|style|CODE|1615377|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx^0|0|0|1O|4|1O|4|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@$I|Z|J|10|1|11]]|A|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

You can create an array with the size set to a variable, i.e.

<pre><code>int size = 50;
string[] words = new string[size]; // contains 50 strings
</code></pre>

However, that size can't change later on, if you decide you need 100 words. If you need the size to be really dynamic, you'll need to use a different sort of data structure. Try <a href="http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx" rel="noreferrer"><code>List</code></a>.

blocks|key|1400720|text|如果是在.NET+1.x中，则使用ArrayList；如果在.NET+2.0或3.x中，则使用List<yourtype>。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1400721|在System.Collections和System.Collections.Generics中搜索它们。|1400722|entityMap^0|H|9|1B|E|0|1|I|K|R|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|I|$]]

Use an <code>ArrayList</code> if in .NET 1.x, or a <code>List&lt;yourtype&gt;</code> if in .NET 2.0 or 3.x.

Search for them in <code>System.Collections</code> and <code>System.Collections.Generics</code>.

blocks|key|1400810|text|如果您的数据是唯一的，您可能还想查看字典，这将为您提供两列以供使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1400811|用户名、账单合计|1400812|它为你提供了很多内置的工具来搜索和更新价值。|1400813|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

You might also want to look into Dictionarys if your data is unique, This will give you two columns to work with.

User name , Total bill

it gives you a lot of built in tools to search and update just the value.

blocks|key|1615326|text|var+yummy+=+new+List<string>();
while(person.FeelsHappy())+{
++++yummy.Add(person.GetNewFavoriteFood());
}
Console.WriteLine("Sweet!+I+have+a+list+of+size+{0}.",+list.Count);
Console.WriteLine("I+didn't+even+need+to+know+how+big+to+make+it+"+%2B
++++"until+I+finished+making+it!");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1615327|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>var yummy = new List&lt;string&gt;();
while(person.FeelsHappy()) {
 yummy.Add(person.GetNewFavoriteFood());
}
Console.WriteLine("Sweet! I have a list of size {0}.", list.Count);
Console.WriteLine("I didn't even need to know how big to make it " +
 "until I finished making it!");
</code></pre>

blocks|key|1400784|text|尝试使用泛型列表而不是数组|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1400785|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

try a generic list instead of array

blocks|key|1615569|text|简而言之，请使用集合和泛型。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1615570|这对任何C#开发人员来说都是必须的，值得花时间学习:)|1615571|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

In a nutshell, please use Collections and Generics.

It's a must for any C# developer, it's worth spending time to learn :)

blocks|key|1400886|text|如上所述，通用List<>是实现此目的的最佳方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1400887|如果你被困在.NET+1.*中，那么你将不得不使用ArrayList类。这没有编译时类型检查，您还必须添加casting+messy。|1400888|后续版本还实现了各种变体--包括线程安全变体。|1400889|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

As detailed above, the generic List&lt;> is the best way of doing it.

If you're stuck in .NET 1.*, then you will have to use the ArrayList class instead. This does not have compile-time type checking and you also have to add casting - messy.

Successive versions have also implemented various variations - including thread safe variants.

blocks|key|1615661|text|如果您确实需要使用数组而不是列表，那么您可以创建一个在运行时计算其大小的数组，如下所示...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1615662|例如，我想要一个大小为n乘以n的二维数组，n将在运行时从用户处获得|1615663|int+n+=+0;
bool+isInteger+=+int.TryPase(Console.ReadLine(),+out+n);
var+x+=+new+int[n,n];|code-block|syntax|javascript|1615664|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you really need to use an array instead of a list, then you can create an array whose size is calculated at run time like so...

e.g i want a two dimensional array of size n by n. n will be gotten at run time from the user

<pre><code>int n = 0;
bool isInteger = int.TryPase(Console.ReadLine(), out n);
var x = new int[n,n];
</code></pre>

I've just started learning C# and in the introduction to arrays they showed how to establish a variable as an array but is seems that one must specify the length of the array at assignment, so what if I don't know the length of the array?

Array of an unknown length in C#

数据结构

我刚开始学习C#，在数组简介中，他们展示了如何将变量建立为数组，但似乎必须在赋值时指定数组的长度，所以如果我不知道数组的长度怎么办？

问C#中长度未知的数组
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回答 10

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