问题描述

我有一个 C# 接口，其中某些方法参数声明为 object 类型.但是，传递的实际类型可能因实现接口的类而异:

I have a C# interface with certain method parameters declared as object types. However, the actual type passed around can differ depending on the class implementing the interface:

public interface IMyInterface
{
    void MyMethod(object arg);
}

public class MyClass1 : IMyInterface
{
    public void MyMethod(object arg)
    {
        MyObject obj = (MyObject) arg;
        // do something with obj...
    }
}

public class MyClass2 : IMyInterface
{
    public void MyMethod(object arg)
    {
        byte[] obj = (byte[]) arg;
        // do something with obj...
    }
}

MyClass2 的问题在于 byte[] 与 object 的转换是 装箱和拆箱，这是影响性能的计算成本高的操作.

The problem with MyClass2 is that the conversion of byte[] to and from object is boxing and unboxing, which are computationally expensive operations affecting performance.

会用 通用接口 解决这个问题，避免装箱/拆箱?

Would solving this problem with a generic interface avoid boxing/unboxing?

public interface IMyInterface<T>
{
    void MyMethod(T arg);
}

public class MyClass1 : IMyInterface<MyObject>
{
    public void MyMethod(MyObject arg)
    {
        // typecast no longer necessary
        //MyObject obj = (MyObject) arg;
        // do something with arg...
    }
}

public class MyClass2 : IMyInterface<byte[]>
{
    public void MyMethod(byte[] arg)
    {
        // typecast no longer necessary
        //byte[] obj = (byte[]) arg;
        // do something with arg...
    }
}

这是如何在 .NET 与 Mono 中实现的?这两个平台都会对性能产生影响吗?

How is this implemented in .NET vs Mono? Will there be any performance implications on either platform?

谢谢！

推荐答案

我不确定它是如何在 mono 中实现的，但是泛型接口会有所帮助，因为编译器会为使用的每种不同类型创建一个特定类型的新函数(在内部，在少数情况下它可以利用相同的生成函数).如果生成了特定类型的函数，则无需对该类型进行装箱/拆箱.

I'm not sure how it is implemented in mono, but generic interfaces will help because the compiler creates a new function of the specific type for each different type used (internally, there are a few cases where it can utilize the same generated function). If a function of the specific type is generated, there is no need to box/unbox the type.

这就是 Collections.Generic 库在 .NET 2.0 中大受欢迎的原因，因为集合不再需要装箱并且变得更加高效.

This is why the Collections.Generic library was a big hit at .NET 2.0 because collections no longer required boxing and became significantly more efficient.

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