为什么没有对的IEnumerable没有的ForEach扩展方法? [英] Why there is no ForEach extension method on IEnumerable?
问题描述
由另外一个问题问的是缺少邮编启发
功能:
Inspired by another question asking about the missing Zip
function:
为什么会出现在可枚举
类没有的ForEach
扩展方法?或任何?这得到了的ForEach
方法的唯一类是名单,其中;>
。还有一个原因,为什么它的缺失(性能)?
Why is there no ForEach
extension method in the Enumerable
class? Or anywhere? The only class that gets a ForEach
method is List<>
. Is there a reason why it's missing (performance)?
推荐答案
目前已包括在完成这一工作语言中的foreach语句的大部分时间。
There is already a foreach statement included in the language that does the job most of the time.
我讨厌看到以下内容:
list.ForEach( item =>
{
item.DoSomething();
} );
相反的:
foreach(Item item in list)
{
item.DoSomething();
}
后者是更清晰,更易于阅读的在大多数情况下,虽然也许有点更长的时间来输入。
The latter is clearer and easier to read in most situation, although maybe a bit longer to type.
不过,我必须承认,我改变了我的立场,在这个问题上;一个foreach()扩展方法确实是在某些情况下非常有用。
However, I must admit I changed my stance on that issue; a ForEach() extension method would indeed be useful in some situations.
下面是语句和方法之间的主要区别:
Here are the major differences between the statement and the method:
- 类型检查:的foreach是在运行,的ForEach()是在编译时(!大加)
- 要调用一个委托的语法确实要简单得多:objects.ForEach(DoSomething的);
- 的ForEach()可以被链接:。虽然这样的功能邪恶/实用性有待商榷
这些是很多人在这里所做的所有伟大的观点,我能看到为什么人们缺少的功能。我不会介意微软加入了标准的ForEach方法,在未来框架的迭代。
Those are all great points made by many people here and I can see why people are missing the function. I wouldn't mind Microsoft adding a standard ForEach method in the next framework iteration.
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