有人可以对这 3 位最重要的代表提供一个很好的解释(希望有例子):
Can someone provide a good explanation (hopefully with examples) of these 3 most important delegates:
谓词
:本质上是Func
;提出问题指定的参数是否满足委托所代表的条件?"用于 List.FindAll 之类的东西.
Predicate
: essentially Func<T, bool>
; asks the question "does the specified argument satisfy the condition represented by the delegate?" Used in things like List.FindAll.
Action
:给定参数执行一个动作.非常通用的用途.在 LINQ 中使用不多,因为它基本上意味着副作用.
Action
: Perform an action given the arguments. Very general purpose. Not used much in LINQ as it implies side-effects, basically.
Func
:在 LINQ 中广泛使用,通常用于转换参数,例如通过将复杂结构投影到一个属性.
Func
: Used extensively in LINQ, usually to transform the argument, e.g. by projecting a complex structure to one property.
其他重要代表:
EventHandler
/EventHandler
:在整个 WinForms 中使用
EventHandler
/EventHandler<T>
: Used all over WinForms
Comparison<T>
:与 IComparer
Comparison<T>
: Like IComparer<T>
but in delegate form.
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