避免重复的代码在多个类似的方法（C＃） [英] Avoiding repetitive code in multiple similar methods (C#)

问题描述

请问大家！

我在C＃中有一些非常类似的方法（可能会有几十个）。它们都基于几乎相同的模式：

I have a set of a few (and potentially will have dozens more) of very similar methods in C#. They all built on almost identical pattern:

ResultObjectType MethodX(...input parameters of various types...)
{
  nesting preparation code here...
  {
    {
      resultObject = ExternalClass.GetResultForMethodX(input parameters of MethodX);
    }
  }
  nesting result processing code here ...
  return resultObject;
}

重复/相同的部分： ResultObjectType，准备代码，结果处理代码

Repeating/identical parts: ResultObjectType, preparation code, result processing code.

不同的部分：ExternalClass方法调用，输入参数集（输入参数数量及其类型）。

Different parts: ExternalClass method to call, input parameter set (number of input parameters, their types).

重要提示：我无法控制方法签名 - 无法更改。

我试图避免重复所有类似代码的块，如下所示：

I am trying to avoid repeating all blocks of similar code with something like this:

ResultObjectType MethodX(...input parameters of various types...)
{
    return  UniversalMethod( 
                   new ExternalMethodDelegate(ExternalClass.GetResultForMethodX),
                   input parameters of MethodX...);
}

ResultObjectType UniversalMethod (Delegate d, input parameters of various types...)
{
    nesting preparation code...
    {
        {
           resultObject = 
              (d as ExternalMethodDelegate)(same input parameters as above);
        }
    }
    nesting result processing code...
    return resultObject;
}

到目前为止，我只是设法使其以这种方式工作，以防万一参数在编码时具有相同的已知类型。经过一番尝试解决这个问题，通用代表我开始认为这是不可能实现的。即使我的代码编译，它在运行时也不起作用。任何人感谢您的帮助！

So far I only managed to make it work in this manner in case where all parameters have the same known type at the time of coding. After a number of attempts to tackle this problem with generic delegates I am starting to think this is not possible to achieve. Even when my code compiles, it does not work at runtime. Any takers? Thanks in advance for your help!

推荐答案

以下是使用泛型代理的示例：

Here's an example using generic delegates:

int MethodY(int something, int other)
{
    return UniversalMethod(() => GetResultForMethodY(something, other));
}

string MethodX(string something)
{
    return UniversalMethod(() => GetResultForMethodX(something));
}

T UniversalMethod<T>(Func<T> fetcher)
{
    T resultObject;
    //nesting preparation code here...
    {
        resultObject = fetcher();
    }
    //nesting result processing code here ...
    return resultObject;
}

如果ResultObjectType始终相同，则可以删除所有 T s。

If ResultObjectType is always the same then you can remove all Ts.

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