LINQ区别不使用IEqualityComparer？(LINQ Distinct not using the IEqualityComparer? [duplicate])

 
 
 这个问题在这里已有答案： 
 
 
 
  
 IEqualityComparer无法正常工作 3个答案 
 
 
 
 
 我有以下型号： 
 
public class Word {
      public string Original { get; set; }
      public string Normalized { get; set; }
      public string Root { get; set; }
      public string Subroot { get; set; }
      public Regex SubrootRegex { get; set; }
}
 
 我创建了以下三个IEqualityComparer<Word> ： 
 
public class NormalizedWordComparer : IEqualityComparer<Word> {
     public bool Equals(Word x, Word y) {
          return x.Normalized == y.Normalized;
     }
     public int GetHashCode(Word obj) {
          return obj.GetHashCode();
     }
}

public class RootWordComparer : IEqualityComparer<Word> {
     public bool Equals(Word x, Word y) {
          return x.Root == y.Root;
     }
     public int GetHashCode(Word obj) {
          return obj.GetHashCode();
     }
}

public class SubrootWordComparer : IEqualityComparer<Word> {
     public bool Equals(Word x, Word y) {
          return x.Subroot == y.Subroot;
     }
     public int GetHashCode(Word obj) {
          return obj.GetHashCode();
     }
}
 
 在另一个课程中，我尝试执行以下操作： 
 
_normalizedWords = ConfigurationFacade.Words.Select(w => {
     Word word = new Word() { Original = w };
     word.Normalized = Normalize(word, _filters);
     word.Root = GetRoot(word.Normalized, ConfigurationFacade.WordRootPercentage);
     word.Subroot = GetRoot(word.Root, ConfigurationFacade.WordSubrootPercentage);
     word.SubrootRegex = null; //Complicated regex here
     return word;
}).Distinct(new NormalizedWordComparer());

_wordRoots = _normalizedWords.Distinct(new RootWordComparer());
_wordSubroots = _wordRoots.Distinct(new SubrootWordComparer());
 
 但是， _normalizedWords ， _wordRoots和_wordSubroots都会以相同数量的元素结束，就好像Distinct()方法不起作用或者忽略比较器一样。 
 
 我用调试器检查了元素，并且有很多具有相同的Root值，因此在_wordRoots应该只有一个，但事实并非如此，它们不会被删除或过滤。 
 
 为什么我的Distinct()不起作用？ 

 
 
This question already has an answer here:
 
 
 
  
 IEqualityComparer not working as intended  3 answers  
 
 
 
 
I have the following model:
 
public class Word {
      public string Original { get; set; }
      public string Normalized { get; set; }
      public string Root { get; set; }
      public string Subroot { get; set; }
      public Regex SubrootRegex { get; set; }
}
 
I have created the following three IEqualityComparer<Word>:
 
public class NormalizedWordComparer : IEqualityComparer<Word> {
     public bool Equals(Word x, Word y) {
          return x.Normalized == y.Normalized;
     }
     public int GetHashCode(Word obj) {
          return obj.GetHashCode();
     }
}

public class RootWordComparer : IEqualityComparer<Word> {
     public bool Equals(Word x, Word y) {
          return x.Root == y.Root;
     }
     public int GetHashCode(Word obj) {
          return obj.GetHashCode();
     }
}

public class SubrootWordComparer : IEqualityComparer<Word> {
     public bool Equals(Word x, Word y) {
          return x.Subroot == y.Subroot;
     }
     public int GetHashCode(Word obj) {
          return obj.GetHashCode();
     }
}
 
In another class, I am trying to do the following:
 
_normalizedWords = ConfigurationFacade.Words.Select(w => {
     Word word = new Word() { Original = w };
     word.Normalized = Normalize(word, _filters);
     word.Root = GetRoot(word.Normalized, ConfigurationFacade.WordRootPercentage);
     word.Subroot = GetRoot(word.Root, ConfigurationFacade.WordSubrootPercentage);
     word.SubrootRegex = null; //Complicated regex here
     return word;
}).Distinct(new NormalizedWordComparer());

_wordRoots = _normalizedWords.Distinct(new RootWordComparer());
_wordSubroots = _wordRoots.Distinct(new SubrootWordComparer());
 
However, _normalizedWords, _wordRoots and _wordSubroots all end up with the same amount of elements, as if the Distinct() method didn't work or the comparer is being ignored.
 
I checked the elements with the debugger, and there are a lot that have the same Root value, so there should only be one of them in _wordRoots, but that's not the case, they are not removed or filtered.
 
Why is my Distinct() not working?

原文：https://stackoverflow.com/questions/31052902