泛型 - 开放和封闭的构造类型
最近我注意到，构造泛型类型可以是开放的，closed.But我不能做什么他们实际上mean.can你举一个简单的例子吗？
Recently i noticed that Generics constructed types can be open and closed.But I am unable what do they actually mean.can you give a simple example?
在实践中的术语都无所谓了 - 我不记得上一次我不得不担心它的除了的当试图写它。
In practice the terminology doesn't really matter much - I can't remember the last time I had to worry about it except when trying to write about it.
- 的绑定的类型也没有指定类型的参数
- A 构建的类型至少有一个类型参数指定
- A型参数是的开放式的
- 的数组类型，其中的元素类型是开放的是一个的开放式的
- 的打开的构造类型都有至少一种类型的参数，它是一个开放型
- A 关闭的类型是任何类型的不开放
- An unbound type has no type arguments specified
- A constructed type has at least one type argument specified
- A type parameter is an open type
- An array type where the element type is open is an open type
- An open constructed type has at least one type argument which is an open type
- A closed type is any type which isn't open
（有嵌套类型的其他规则。请教C＃3.0规范4.4节血淋淋的细节。）
(There are further rules for nested types. Consult the C# 3.0 spec section 4.4 for gory details.)
作为一个开放的构造类型的一个例子，考虑：
As an example of an open constructed type, consider:
public class NameDictionary<T> : Dictionary<string, T>
的基类中的typeof（NameDictionary＆LT;＆GT;）是：
- 建造，因为它指定类型参数
- 开启，因为第二个类型参数（
T）是一个开放式
- Constructed because it specifies type arguments
- Open because the second type argument (
T) is an open type
MSDN文档的Type.IsGenericType$c$c>有相当有用的小桌子。
The MSDN docs for Type.IsGenericType have quite a useful little table.
只是重申一下，这是日常使用几乎完全是不重要的。
Just to reiterate, this is almost entirely unimportant in day to day use.
我一般赞成知道正确的术语 - 尤其是对像按引用传递等等 - 但在这种情况下，它真的，真的不上来非常频繁。我想不用担心它积极鼓励你：）
I'm generally in favour of knowing the correct terminology - particularly for things like "pass by reference" etc - but in this case it really, really doesn't come up very often. I would like to actively discourage you from worrying about it :)