（更新，感谢捐款来自其他用户）

(updated, thanks to contributions from other users)

不同于类，结构是在堆栈中创建。因此，它是更快实例（和销毁）一个结构不是一个类。

Unlike class, struct is created on stack. So, it is faster to instantiate (and destroy) a struct than a class.

除非（亚当·罗宾逊指出的）结构是在这种情况下，它被分配在堆中的类成员，以及其他一切。

Unless (as Adam Robinson pointed out) struct is a class member in which case it is allocated in heap, along with everything else.

在另一方面，每次分配结构或将它传递给一个函数的时候，它就会被复制。

On the other hand, every time you assign a structure or pass it to a function, it gets copied.

我不认为有一个结构大小的硬性限制。千字节肯定是太多了。 MSDN 说：

I don't think there's a hard limit for a struct size. Thousands of bytes is definitely too much. MSDN says:

除非你需要引用类型   语义，一类是小   大于16字节可以更有效地   通过该系统处理为一个结构。

Unless you need reference type semantics, a class that is smaller than 16 bytes may be more efficiently handled by the system as a struct.

这是 - 如果你需要按引用传递这使它成为一个类，无论大小击>

在第二个想法，你仍然可以通过结构由简单地引用在函数参数列表中指定裁判。

On the second thought, you can still pass struct by reference simply by specifying ref in the function parameter list.

所以，大的结构实际上是确定的，如果你通过引用传递，并作为类成员使用。

So, a large struct can actually be ok if you pass it by reference and use as a class member.