"() =>" 在 C# 中是什么意思?
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What does "() =>" mean in C#?
提问by Edward Tanguay
Came across the following line in the Composite Application Guidelines.
在复合应用程序指南中遇到以下行。
I know the =>is a lambda but what does the ()mean?
我知道=>是一个 lambda 但()是什么意思?
What are some other examples of this?
这方面还有哪些其他例子?
What is it called so I can search for it?
它叫什么,我可以搜索它?
this.regionViewRegistry.RegisterViewWithRegion(RegionNames.SelectionRegion
, () => this.container.Resolve<EmployeesListPresenter>().View);
采纳答案by Ward Werbrouck
It's a lambda expression that takes 0 arguments
这是一个带 0 个参数的 lambda 表达式
回答by Alex Fort
That's an empty argument list, meaning the lambda expression takes no arguments.
这是一个空的参数列表,这意味着 lambda 表达式没有参数。
回答by Mendelt
If you look at x => x + 1
如果你看 x => x + 1
It takes a parameter x and returns x incremented by one. The compiler will use type inference to deduct that x is probably of type int and will return another int so you have a lambda that takes a parameter x of type int and returns an integer.
它接受一个参数 x 并返回 x 递增一。编译器将使用类型推断来推断 x 可能是 int 类型,并将返回另一个 int,因此您有一个 lambda,它采用 int 类型的参数 x 并返回一个整数。
() => 3;
is the same but doesn't take a parameter, it will return an integer.
相同但不带参数,它将返回一个整数。
() => Console.WriteLine("hello");
Will result in a void method with no parameters.
将导致没有参数的 void 方法。