C＃重写实例方法 [英] C# override instance method

问题描述

所以基本上我有一个对象，需要实例并将它们添加到列表中。每个实例都使用虚拟方法，这是我需要的，一旦实例被创建覆盖。我怎么会去覆盖实例的方法？

So basically I have an object that takes instances and adds them to a list. Each instance uses virtual methods, which I need to override once the instance is created. How would I go about overriding methods of an instance?

推荐答案

您不能。您只能定义一个类时覆盖的方法。

You can't. You can only override a method when defining a class.

最好的办法是转而使用适当的 Func键委托作为一个占位符，并允许呼叫者提供实现这种方式：

The best option is instead to use an appropriate Func delegate as a placeholder and allow the caller to supply the implementation that way:

public class SomeClass
{
    public Func<string> Method { get; set; }

    public void PrintSomething()
    {
        if(Method != null) Console.WriteLine(Method());
    }
}

// Elsewhere in your application

var instance = new SomeClass();
instance.Method = () => "Hello World!";
instance.PrintSomething(); // Prints "Hello World!"

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