List with distinct values inside only

This question already has an answer here:

LINQ's Distinct() on a particular property 17 answers

---

如果你想通过Id区分元素：

foreach (var x in mydata)
 {                
    var model = new MyViewModel()
    {
       Id = x.Days.Id,
       Name = x.Days.Name                                   
    };                                    
    if(!models.Contains(x=>x.Id==model.Id)
        models.Add(model);
 }

---

你可以使用HashSet<T> ，就像这样：

// Ids that was used before
HashSet<int> Ids = new HashSet<int>();

foreach (var x in mydata) {                
  // Check for duplicates
  if (Ids.Contains(x.Days.Id))
    continue; // <- duplicate
  else
    Ids.Add(x.Days.Id);

  // Your code
  var model = new MyViewModel() {
    Id = x.Days.Id,

    Name = x.Days.Name                                   
  };                                    

  models.Add(model);
}

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