C＃將靜態字典分配給靜態類中其他字典的已過濾版本

Question

我有一個類，帶有一些全局字典和常量字典。喜歡：

public static class Constants 
{ 
    public static Dictionary<string, MyObject> MyDictionary= new Dictionary<string, MyObject>() 
    { 
     {"first", new MyObject()}, 
     {"second", new MyObject()}, 
    }; 
} 

可以說我想要另一個字典，就像那只有一些添加和刪除的元素。有沒有辦法在靜態類中實現這一點？我想像這樣：

public static Dictionary<string, MyObject> MyOtherDictionary = MyDictionary.Remove("second").Add("Third", new MyObject()) 

但我知道這是行不通的，那麼有什麼辦法可以實現這一目標嗎？

Answer 1

沒有，這樣是行不通的，原因有二：

1. Remove返回bool，你不能在布爾使用Add
2. 即使你把它編譯，你不要修改的其他字典，而是要創建一個包含類似項目一個新的字典，您可以使用構造：

---

public static Dictionary<string, MyObject> MyOtherDictionary; 
// ... 
static Constants 
{ 
    MyOtherDictionary = new Dictionary<string, MyObject>(MyDictionary); 
    MyOtherDictionary.Remove("second"); 
    MyOtherDictionary.Add("Third", new MyObject()); 
} 

Answer 2

你可以使用屬性，而不是

public static class Constants 
{ 
    public static Dictionary<string, MyObject> myDictionary 
    { 
     get 
     { 
      return new Dictionary<string, MyObject>() 
      { 
       { "first", new MyObject()}, 
       { "second", new MyObject()}, 
      }; 
     } 
    } 

    static Dictionary<string, MyObject> _myOtherDictionary; 
    public static Dictionary<string, MyObject> myOtherDictionary 
    { 
     get 
     { 
      _myOtherDictionary = myDictionary; 
      _myOtherDictionary.Remove("first"); 
      _myOtherDictionary.Add("third", new MyObject()); 
      return _myOtherDictionary; 
     } 
    } 
}