将函数作为函数参数传递 [英] Passing a function as a function parameter

问题描述

Unity C#似乎无法将Func<>符号识别为函数委托.那么，如何将函数作为函数参数传递呢?

我认为Invoke(functionName, 0)可能会有所帮助.但是我不确定它是否实际上是立即调用该函数，还是等待帧结束.还有另一种方法吗?

解决方案

您可以使用Action来实现

 using System;

// ...

public void DoSomething(Action callback)
{
    // do something

    callback?.Invoke();
}
 

并传递诸如

之类的方法调用

 private void DoSomethingWhenDone()
{
    // do something
}

// ...

DoSomething(DoSomethingWhenDone);
 

或使用lambda

 DoSomething(() =>
    {
        // do seomthing when done
    }
);
 

---

您还可以添加参数，例如

 public void DoSomething(Action<int, string> callback)
{
    // dosomething

    callback?.Invoke(1, "example");
}
 

并再次传入类似

的方法

 private void OnDone(int intValue, string stringValue)
{
    // do something with intVaue and stringValue
}

// ...    

DoSomething(OnDone);
 

或lambda

 DoSomething((intValue, stringValue) =>
    {
        // do something with intVaue and stringValue
    }
);
 

---

或者也可以参见代表

尤其是对于具有动态参数计数和类型的代表来说，请查看这篇文章

Unity C# doesn't seem to recognize the Func<> symbol as a function delegate. So, how can I pass a function as a function parameter?

I have an idea that Invoke(functionName, 0) might help. But I am not sure whether it actually invokes the function instantly, or waits for the end of the frame. Is there another way?

解决方案

You can use Action to do that

using System;

// ...

public void DoSomething(Action callback)
{
    // do something

    callback?.Invoke();
}

and either pass in a method call like

private void DoSomethingWhenDone()
{
    // do something
}

// ...

DoSomething(DoSomethingWhenDone);

or using a lambda

DoSomething(() =>
    {
        // do seomthing when done
    }
);

---

you can also add parameters e.g.

public void DoSomething(Action<int, string> callback)
{
    // dosomething

    callback?.Invoke(1, "example");
}

and again pass in a method like

private void OnDone(int intValue, string stringValue)
{
    // do something with intVaue and stringValue
}

// ...    

DoSomething(OnDone);

or a lambda

DoSomething((intValue, stringValue) =>
    {
        // do something with intVaue and stringValue
    }
);

---

Alternatively also see Delegates

and especially for delegates with dynamic parameter count and types check out this post

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