有没有办法将WITH参数作为新动作传递？

Question

可以做到

using System;

Action action = new Action(Console.WriteLine);

action(); //will write a empty line

但有没有办法传递带参数的方法，例如

using System;

Action action = new Action(Console.WriteLine("Hello World")); //This doesn't work

action(); //want it to write a line which will say "Hello World"

Answer 1

试试这个：

Action action = new Action(() => Console.WriteLine("Hello World"));

或如提到@JeroenMostert

Action action = () => Console.WriteLine("Hello World");

Answer 2

你也可以这样做

Action<int> print = ConsolePrint;
print(10);

static void ConsolePrint(int i)
{
    Console.WriteLine(i);
}

或者你也可以这样做

Action<int> print = (i)=>  Console.WriteLine(i);
print(10);

Answer 3

您可以使用这样的通用操作

Action<string> writeLine = Console.WriteLine;
writeLine("hello");