包装不同程序员的类

问题描述

假设我有许多不同的程序员开发的类，所以我不能更改他的代码.所有这些类都具有相同的构造函数，并且它们都是从相同的基类派生的.
我想修改此类的基本构造函数(但我不能).有没有一种方法可以重用此类，而无需直接更改它们，而是使用其他构造函数.例子:

suppose I have many classes developed by a different programmer, so that I cannot change his code. All these classes has the same constructor and they are all derived from the same base class.
I would like to modified the base constructor of this classes (but I can''t). Is there a way to reuse this classes without changing them directly, but using a different constructor. An example:

class A
      {
          public A(List<double> a) { }
      }

      class A1: A
      {
          public A1(List<double> a):base(a) { }
      }

      class A2:A
      {
          public A2(List<double> a):base(a) { }
      }

我不能更改A，A1，A2类.我想使用它们允许接受double []而不是List< double>作为构造函数.我不想每次都包装.

I can''t change classes A, A1, A2. I want to use them allowing to accept double[] instead of List<double> as constructor. I dont want to wrap each time. Is there a design solution?

推荐答案

//using System.Reflection;

    public static class Wrapper
    {
        // where clause ensures that it only works for the A class and it's derived classes
        public static T CreateA<T>(double[] a) where T : TheOriginalClasses.A
        {
            // Get the cconstructor
            Type[] types = new Type[1];
            types[0] = typeof(List<double>);
            ConstructorInfo constructorInfo = typeof(T).GetConstructor(types);

            // Invoke the constructor
            object[] objects = new object[1];
            objects[0] = a.ToList();
            T value = constructorInfo.Invoke(objects) as T;

            return value;
        }
    }

您可以将其称为以下代码:

You can call this which the following code:

double[] a = new double[3] { 0.5, 1.1, 2.5 };

var testA = Wrapper.CreateA<TheOriginalClasses.A>(a);
var testA1 = Wrapper.CreateA<TheOriginalClasses.A1>(a);
var testA2 = Wrapper.CreateA<TheOriginalClasses.A2>(a);

Console.WriteLine(testA.GetType().ToString());
Console.WriteLine(testA1.GetType().ToString());
Console.WriteLine(testA2.GetType().ToString());

我不确定这段代码是否会赢得一次代码选美大赛，但是它将为您提供通用包装器.缺点可能是由于使用了反射而导致的性能损失.

I''m not sure if this code will win a code beauty contest, but it will give you a generic wrapper. A disadvantage might be performance loss due to using Reflection.

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