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        代表:谓词 vs. 动作 vs. Func

        时间:2023-11-11
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                  本文介绍了代表:谓词 vs. 动作 vs. Func的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  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
                  • 行动
                  • 功能

                  推荐答案

                  • 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 类似,但采用委托形式.

                      Comparison<T>: Like IComparer<T> but in delegate form.

                      这篇关于代表:谓词 vs. 动作 vs. Func的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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