C# 我应该如何创建回调
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How should i create a callback
提问by
What is the best way to write a callback? I only need to call 1 function that has the sig of void (string, int); and this would need to invoke a class since i have member objs that i need to process. Whats the best way to write this? in C i would do pass a func pointer and an void*obj. i dislike that and i suspect there is a better way to do this in C#?
编写回调的最佳方法是什么？我只需要调用 1 个具有 void (string, int) 信号的函数；这将需要调用一个类，因为我有需要处理的成员对象。写这个最好的方法是什么？在 C 中，我会传递一个 func 指针和一个 void*obj。我不喜欢那样，我怀疑在 C# 中有更好的方法来做到这一点？
采纳答案by Reed Copsey
The standard way of handling (or replacing the need for) callbacks in C# is to use delegates or events. See this tutorial for details.
在 C# 中处理（或替换需要）回调的标准方法是使用委托或事件。 有关详细信息，请参阅本教程。
This provides a very powerful, clean way of handling callbacks.
这提供了一种非常强大、干净的回调处理方式。
回答by Samuel
C#3.0 introduced lambdas which allow you forgo the declaration of callback (or delegate) signatures. It allows you to do things like:
C#3.0 引入了 lambdas，它允许您放弃回调（或委托）签名的声明。它允许您执行以下操作：
static void GiveMeTheDate(Action<int, string> action)
{
var now = DateTime.Now;
action(now.Day, now.ToString("MMMM"));
}
GiveMeTheDate((day, month) => Console.WriteLine("Day: {0}, Month: {1}", day, month));
// prints "Day: 3, Month: April"
回答by bytebender
Is this what you mean?
你是这个意思吗？
thatfunc(params, it, wants, Func<myObject> myCallbackFunc)
{
myObject obj = new Object();
myCallbackFunc.Invoke(obj);
//or
myCallbackFunc.Invoke(this);
//I wasn't sure what if myObject contained thatFunc or not...
}
