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@Calgary

i think you are really talking about DI constructor, honestly

sowen(昂居居)
I am never a big fan of using constructor injection, even though it's really convenient in many cases.

Personally, I lean to have property injection or a wrapper injection; however, that doesn't mean I am against using constructor injection. You just need to be careful.

The bottom line is, if you have too many parameters in whatever (either constructor or a public method), it's going to reduce the readability.

If an object requires a lot of input to become useful, it is possibly this object has too many responsibilities, or it could become a base abstract object, or it could benefit from a wrapper, or it could rely on a dedicated factory, and so on...

For myself, if I have more than 10 parameters in the constructor, I will think twice of adding more and try to refactor the object. But just my 2 cents
(#8912951@0)
Last Updated: 2014-8-5
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Replies, comments and Discussions:

  • 工作学习 / 学科技术讨论 / C#的构造函数， 有0个参数和n个参数的区别很大吗？ 比如n=50 -outlink(outlink); 2014-8-2 (#8909830@0)
    • 基本上超过5个就要重构 -sxffff(lookingforjob); 2014-8-2 (#8909877@0)
    • 如果参数有50个，你为啥不用一个class 给封装一下呢？否则 你传参数的时候，你眼睛不花吗？ 如果把这50个参数都写进构造函数里面，你眼睛能对焦过来吗？ 那么写代码是纯粹的打铁的写代码方式！ :-) -boolean(北漂一族); 2014-8-2 (#8909879@0)
      • 我记得以前调用office 2007的api，那参数没有50，10-20总该有了，看的我是老眼昏花 -binghongcha76(一只大猫); 2014-8-3 (#8910764@0)
        • You should use VB.NET to call Office API and pass only the parameters required. -wnms2000(乘风归去); 2014-8-5 (#8913055@0)
          • 现在开发Office Application可以用NetOffice, 在NuGet上可以看到，很轻量、很方便 -binghongcha76(一只大猫); 2014-8-7 (#8916837@0)
      • 小嫩孩，玩过DI 吗？ -outlink(outlink); 2014-8-4 (#8912199@0)
        • 你说的是 依赖注入？ ^_^ 都是framwork帮你自动做的东西。 我自己都可以手动实现依赖注入。 有啥不会玩的啊？ :-) -boolean(北漂一族); 2014-8-18 (#8938699@0)
    • i think you are really talking about DI constructor, honestly -sowen(昂居居); 2014-8-5 {830} (#8912951@0)
      I am never a big fan of using constructor injection, even though it's really convenient in many cases.

      Personally, I lean to have property injection or a wrapper injection; however, that doesn't mean I am against using constructor injection. You just need to be careful.

      The bottom line is, if you have too many parameters in whatever (either constructor or a public method), it's going to reduce the readability.

      If an object requires a lot of input to become useful, it is possibly this object has too many responsibilities, or it could become a base abstract object, or it could benefit from a wrapper, or it could rely on a dedicated factory, and so on...

      For myself, if I have more than 10 parameters in the constructor, I will think twice of adding more and try to refactor the object. But just my 2 cents
      • 可以通过factory来解决。 -outlink(outlink); 2014-8-9 (#8921033@0)
      • 赞 -hiker2(hiker); 2014-8-9 (#8921066@0)
        • factory 只是 creation pattern 里面的一种，你建Object，要根据情况选其中一种或多种， 不明白跟DI有什么关系。 -sxffff(lookingforjob); 2014-8-9 (#8921519@0)
          • factory 可以玩的很花。 慢慢学去吧。 -outlink(outlink); 2014-8-12 (#8926807@0)
            • 上下文接不上. -sxffff(lookingforjob); 2014-8-12 (#8927184@0)
              • 他就在那里装老。 哈哈 你说的factory pattern 的实质非常正确。人家问题是如何处理多参数的构造函数问题，他只是照本宣科的知道几个pattern 就在这里装老人！笑死人了。design pattern背后的核心思想就是封装。估计他还理解不到这个层次！ -boolean(北漂一族); 2014-8-25 (#8948941@0)
            • design pattern 就是玩花活儿 在我看来。你再玩的怎么花， 还不是跑不出那23个pattern？ design pattern的东西都是事后打补丁的东西，有啥可了不起的呢？ 还是C来的直接方便，向伟大的C语言致敬！^_^ -boolean(北漂一族); 2014-8-18 (#8938705@0)
              • 不求上进的小盆友。 -outlink(outlink); 2014-8-24 (#8946696@0)
                • ：） -boolean(北漂一族); 2014-8-25 (#8948911@0)
                • 你已经被面向对象的语言模式深深的洗脑了！小盆友，多看看其他语言吧！ 多去了解 了解 functional languages 比如： scala Haskell Erlang etc. 然后再回头审视你的OO吧！ :-) -boolean(北漂一族); 2014-8-25 (#8948915@0)
                  • 木有冲突的，一个是状态转换，一个是属性包装，合起来用刚刚好，学了用了好十几年OOP，总觉得缺了点啥，现在明白了。语言，环境，工具，缺一不可啊。 -wxlin2k(wxlin2k); 2014-8-25 (#8949072@0)
            • 你玩的花的话，就有可能转到其他的pattern上去了。 -boolean(北漂一族); 2014-8-25 {219} (#8948945@0)
              本身就不是factory pattern了。记住 pattern 是要活学活用的。要做到手中无刀，胸中有刀。这才是pattern灵活运用的最高境界。如果就是背几个pattern，然后生搬硬套上去用，很容易就用错！明白不？ 小盆友？讲到pattern，我能喷晕你！^_^
              • 够臭！ -outlink(outlink); 2014-8-26 (#8950754@0)

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