C# 将函数作为参数传递 [英] C# Passing Function as Argument

问题描述

我用 C# 编写了一个函数来进行数值微分.它看起来像这样:

I've written a function in C# that does a numerical differentiation. It looks like this:

public double Diff(double x)
{
    double h = 0.0000001;

    return (Function(x + h) - Function(x)) / h;
}

我希望能够传入任何函数，例如:

I would like to be able to pass in any function, as in:

public double Diff(double x, function f)
{
    double h = 0.0000001;

    return (f(x + h) - f(x)) / h;
}

我认为这对委托是可能的(也许?)但我不确定如何使用它们.

I think this is possible with delegates (maybe?) but I'm not sure how to use them.

任何帮助将不胜感激.

推荐答案

使用上面提到的 Func 是可行的，但也有执行相同任务并在命名中定义意图的委托:

Using the Func as mentioned above works but there are also delegates that do the same task and also define intent within the naming:

public delegate double MyFunction(double x);

public double Diff(double x, MyFunction f)
{
    double h = 0.0000001;

    return (f(x + h) - f(x)) / h;
}

public double MyFunctionMethod(double x)
{
    // Can add more complicated logic here
    return x + 10;
}

public void Client()
{
    double result = Diff(1.234, x => x * 456.1234);
    double secondResult = Diff(2.345, MyFunctionMethod);
}

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