的LINQ允许你创建新的对象的查询EX pression内。当你有一个封装列表生成类中这是非常有用的。我想知道你是如何处理那些需要它创建的对象呢?
Linq allows you to create new object inside of a query expression. This is useful when you have classes that encapsulate generation of a list. I’m wondering how you dispose of objects that are created that need it?
例如:
class Generator
{
public IEnumerable<int> Gen(int size)
{
return Enumerable.Range(0, size);
}
}
class bar
{
public void doit()
{
var foo =
from r in Enumerable.Range(1, 3)
from g in new Generator().Gen(r)
select g;
}
}
这将创建3个发电机对象将被垃圾在某些时候收集。如果发电机是IDisposable的我怎么会得到的Dispose()调用?
This will create 3 Generator objects that will be garbage collected at some point. If Generator was IDisposable how would I get the Dispose() call?
确定;我希望这是巧合,而是:的SelectMany;结合了IDisposable和LINQ ,这(与自定义的SelectMany
实施)将允许:
OK; I'm hoping this is coincidence, but: SelectMany; combining IDisposable and LINQ, which (with the custom SelectMany
implementation) would allow:
var foo =
from r in Enumerable.Range(1, 3)
from gen in new Generator()
from g in gen.Gen(r)
select g;
(注意,我的假设的存在是一个明智的理由,每做研究
)
(note that I'm assuming there is a sensible reason to do this per r
)
或与使用()
扩展方法(而不是的SelectMany
):
or with the Using()
extension method (instead of SelectMany
):
var foo =
from r in Enumerable.Range(1, 3)
from gen in new Generator().Using()
from g in gen.Gen(r)
select g;