将动作委托作为C＃中的参数传递 [英] Pass action delegate as parameter in C#

问题描述

我有一个接受 Action 委托并执行给定方法的方法，如下所示：

I have a method which accepts an Action delegate and executes the given method as shown here:

public void ExpMethod(Action inputDel)
{
    inpuDel();
}

我可以像上面这样调用给定方法：

I can call above given method like this:

ExpMethod(() => {/*do something that matters*/});

一切正常。到现在为止还挺好。现在，我想拥有一个将通用 Action 委托作为输入参数的方法-像这样：

Everything works fine. So far so good. Now I want to have a method which takes a generic Action delegate as an input parameter - like this:

public void ExpGenMethod(Action<string,int> inputDel)
{
    // I don't know how to call the supplied delegate as it requires parameters
}

此外，我正试图将此称为 ExpGenMethod 这样：

Also, I am trying to call this ExpGenMethod in this way:

ExpGenMethod(("Hi",1) => {/*do something that makes sense*/});

但是它显示语法错误。请让我知道在这种情况下如何使用通用动作委托？

But it shows syntax errors. Please let me know how to use generic action delegate in this case?

推荐答案

委托的全部目的是要有一个指针一种方法。因此，在声明它时将参数传递给它是没有意义的。而是在执行委托的方法中传递委托的参数，在您的情况下，在 ExpGenMethod 中：

The whole point of a delegate is to have a pointer to a method. Passing parameters to it while it´s being declared is therefor pointless. Instead pass the arguments for your delegate within the method that executes the delegate, in your case within ExpGenMethod:

您应改为执行以下操作：

You should do this instead:

public void ExpGenMethod(Action<string,int> inputDel)
{
    inputDel("Hi", 1);
}

并这样称呼它：

ExpGenMethod((x, y) => {/*do something that makes sense*/});

执行该委托时， x 计算为嗨 和 y 到 1 。

When executing that delegate x evaluates to "Hi" and y to 1.

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