在给定的情况下，我应该在哪里初始化集合? [英] where should i initialize collections in the given scenario?

问题描述

我有字典

Dictionary<string, string> Keywords = new Dictionary<string, string>();
Keywords.Add("start", "START");
Keywords.Add("int", "DT");
Keywords.Add("real", "DT");
.
.

该函数在一个类中，如果我在其中定义字典，则每次调用都需要花费很多时间.所以我应该在哪里初始化它?如果我在main()中做到这一点，那我该如何在班级中调用它呢?

this function is in a class and call many times if i define dictionary in it, every time it takes time. so where should i initialize it? if i do this in main() then how can i call it in my class?

public string IsKeyword(string value)
{ 
}

推荐答案

在类级别定义字典.

Define the dictionary at the class level.

class myClass
{
  Dictionary<string,> Keywords = new Dictionary<string,>();

  public void DictionaryInitializer()
  {
     Keywords.Clear();
     Keywords.Add("start", "START");
     Keywords.Add("int", "DT");
     Keywords.Add("real", "DT");
  }

}

当然，Abhinav和SAK的明智评论都为您指明了正确的方向，但让我补充一个补充……也许是多余的..评论:

初始化字典的位置取决于其在项目总体方案"中的战略用途.

1.如果Dictionary对象是被实例化很多次的类的一部分，并且您的意图该类的每个实例都具有该Dictionary的私有实例，则实例化显然属于该类.

2.如果Dictionary对象是许多类(窗体等)的全局资源，并且是不变的，则可以考虑将其放在静态类中，仅公开希望的访问方法等等.或者，可以在"Singleton"类中定义字典.

最好，Bill

Of course both Abhinav''s and SAK''s wise comments point you in the right direction, but let me add one supplementary ... perhaps superfluous ... comment:

Where you initialize the Dictionary depends on its strategic use in the ''total scenario'' in your project.

1. if the Dictionary object is part of a class that is instantiated many times, and it is your intent that each instance of the class has a private instance of this Dictionary, obviously the instantiation belongs in the class.

2. if the Dictionary object is a global resource for many classes (forms, whatever), and is invariant, you can consider putting it in a static class, exposing only those methods of access to it you wish, etc. Or, the Dictionary could be defined in a ''Singleton'' Class.

best, Bill

假设关键字是常量，那么在类级别定义该集合就更有意义了.先前的解决方案已经提到了这一点.我只想补充一点，因为C#4(或3?)可以直接初始化集合(如上文中sa所述).


一个完整的类将如下所示:

Assuming that the keywords are constant, then it makes more sense that the collection is defined at the class level. The previous solutions have already mentioned that. I just want to add that since C#4 (or 3?) it''s possible to initialize the collections directly (as sa has already mentioned above).


a complete class would then look as follows:

static class myClass
{
    static Dictionary<string, string> Keywords = new Dictionary<string, string>() 
        {   
            {"start", "START" },
            { "int", "DT" },
            {"real", "DT"}
        };

    public static string IsKeyword(string value)
    { 
        return "???";
    }
}

我对IsKeyword 方法的签名有些困惑.对于作为类用户的我来说，没有Is...方法返回字符串是没有意义的，这就是为什么我将实现留空的原因.

I''m a bit confused about the signature of the IsKeyword method. for me as a user of the class it doesn''t make sense to have a Is... method that returns a string, that''s why I left the implementation empty.

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