结构中的数组 [英] Arrays in structures

问题描述

我知道结构是值类型，数组和类是

引用类型。但是作为结构成员的数组呢，比如

C


struct x

{

int n;

int a [100];

}


这样的结构如何（例如在C ++中声明为一个班级中的一个字段）

用C＃访问？


Peter Seaman

解决方案

<" Peter Seaman" < StableSoftware.com上的Peter MS Seaman>>写道：

我理解结构是值类型，数组和类是引用类型。但是作为结构成员的数组怎么样呢？


结构x
{/ n>
int a [100];

你不能在C＃中声明它 - 你必须声明它只是


int [] a;


并在构造函数或类似函数中初始化它。结构本身仍然是一个值类型，但变量a将包含一个引用。它与

完全相同，如果你有一个包含字符串引用的结构

或类似的结果。


-

Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet

如果回复该群组，请不要给我发邮件

>并在构造函数或类似函数中初始化它。结构本身是

仍然是值类型，但变量a将包含引用。它与
或类似的结构完全一样。

值类型仅存在于堆栈中，但是包含String的struct

变量是什么？

当我们离开函数时，这个String会发生什么？

Gawel

Gawelek< ga ***** @ NOSPAMEKpoczta.gazeta.pl>写道：

并在构造函数或类似函数中初始化它。结构本身仍然是值类型，但变量a将包含引用。它的结构与包含字符串引用或类似结构的结构完全一样。
值类型只存在于堆栈上

不，他们不是。请参阅
http://www.pobox.com/ ~sibet / csharp / memory.html

但是包含String变量的struct会怎么样？
当我们离开函数时，这个String会发生什么？

它与以往一样：如果没有对字符串的实时引用，

它最终将被垃圾收集。


-

Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet

如果回复该群组，请不要给我发邮件

I understand that structures are value types and arrays and classes are
reference types. But what about arrays as members of structures i.e. as in
C

struct x
{
int n;
int a[100];
}

How is such a structure (e.g. declared in C++ as a field in a class)
accessed in C#?

Peter Seaman

解决方案

<"Peter Seaman" <Peter MS Seaman at StableSoftware.com>> wrote:

I understand that structures are value types and arrays and classes are
reference types. But what about arrays as members of structures i.e. as in
C

struct x
{
int n;
int a[100];
}

How is such a structure (e.g. declared in C++ as a field in a class)
accessed in C#?

You can''t declare it like that in C# - you''d have to declare it as just

int[] a;

and initialise it in a constructor or similar. The struct itself is
still a value type, but the variable a would contain a reference. It''s
exactly the same as if you have a struct containing a string reference
or similar.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

> and initialise it in a constructor or similar. The struct itself is

still a value type, but the variable a would contain a reference. It''s
exactly the same as if you have a struct containing a string reference
or similar.

Value types live only on stack, but what with struct containing String
variable?
What will happen with this String when for example we leave function ?
Gawel

Gawelek <ga*****@NOSPAMEKpoczta.gazeta.pl> wrote:

and initialise it in a constructor or similar. The struct itself is
still a value type, but the variable a would contain a reference. It''s
exactly the same as if you have a struct containing a string reference
or similar.
Value types live only on stack

No they don''t. See
http://www.pobox.com/~skeet/csharp/memory.html
but what with struct containing String variable?
What will happen with this String when for example we leave function ?

It''s the same as always: if there are no live references to the string,
it will eventually be garbage collected.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

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