用抽象接口来接收实现是我们代码中常用的一种手段 IBase base = new Child() ，从来没想过在.net Framework下会对性能造成如此影响。

具体代码如下

private static void Test()
        　　{
          　Base a = new Base();
            AbsBase b = a;
            Child c = new Child();
            IBase d = c;
            Stopwatch stopwatch = new Stopwatch();
            stopwatch.Start();
            for (int i = 0; i < length; i++)
            {
                a.Do();
            }
            Console.WriteLine($"抽象实现类：{stopwatch.ElapsedMilliseconds}");
            stopwatch.Restart();
            for (int i = 0; i < length; i++)
            {
                b.Do();
            }
            Console.WriteLine($"抽象基类：{stopwatch.ElapsedMilliseconds}");
            stopwatch.Restart();
            for (int i = 0; i < length; i++)
            {
                c.Do();
            }
            Console.WriteLine($"接口实现类：{stopwatch.ElapsedMilliseconds}");
            stopwatch.Restart();
            for (int i = 0; i < length; i++)
            {
                d.Do();
            }
       stopwatch.Stop();
       Console.WriteLine($"接口：{stopwatch.ElapsedMilliseconds}");
}

 

    public abstract class AbsBase
    {
        public abstract void Do();
    }

    public class Base : AbsBase
    {
        public override void Do()
        {

        }
    }

    public interface IBase
    {
        public void Do();
    }

    public class Child : IBase
    {
        public void Do()
        {
        }
    }
辅助类定义

Core下运行效果：

 

 Framework下运行效果

 

 二者效果相差甚远，更可怕的是，抽象类的实现的与接口的实现耗时相差也很多