如何定义predicate作为函数参数 [英] How to define a predicate as a function argument

问题描述

我希望能够写的东西为

void Start(some condition that might evaluate to either true or false) {
    //function will only really start if the predicate evaluates to true
}

我猜一定是什么形式的：<​​/ P>

I'd guess it must be something of the form:

void Start(Predicate predicate) {
}

我如何检查在我开始功能只要predicate评估为真或假？是我使用了predicate是否正确？

How can I check inside my Start function whenever the predicate evaluated to true or false? Is my use of a predicate correct?

感谢

推荐答案

下面是一个函数使用predicate的一个简单的例子。

Here's a trivial example of using a predicate in a function.

static void CheckRandomValueAgainstCriteria(Predicate<int> predicate, int maxValue)
{
    Random random = new Random();
    int value = random.Next(0, maxValue);

    Console.WriteLine(value);

    if (predicate(value))
    {
        Console.WriteLine("The random value met your criteria.");
    }
    else
    {
        Console.WriteLine("The random value did not meet your criteria.");
    }
}

...

CheckRandomValueAgainstCriteria(i => i < 20, 40);

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