C# C/LINQ选择具有相同属性的对象的子列表

我是LINQ的初学者，我想知道是否可以使用它来解决以下问题：

我有一门课：

public class myClass
{
  public int Id { get; set; }
  public int Category { get; set; }
  public string Text { get; set; }
}

我有一个myClass对象的列表

public List<myClass> myList;

---

我的子列表中应该有对象A和B，可能不理想，但可能：

var result = myList.GroupBy(x=>x.Text).Where(grp => grp.Count() > 1)
            .SelectMany(x=>x); // .ToList() if you want a list

或在查询语法中：

var result = from x in myList
             group x by x.Text into grp
             where grp.Count() > 1
             from y in grp
             select y; // .ToList() if you want a list

这项工作：

  var sublist = (from a in myList
                from b in myList
                where a.Text == b.Text
                   && a.Id != b.Id
                select a).Distinct();

测试程序：

void Main()
{

    myClass A = new myClass { Id=1, Category=1, Text="Hello World!"};
    myClass B = new myClass { Id=2, Category=2, Text="Hello World!"};
    myClass C = new myClass { Id=3, Category=2, Text="Good Bye!"};
    myClass D = new myClass { Id=4, Category=7, Text="Hello World!"};
    List<myClass> myList = new List<myClass>(); 
    myList.AddRange(new []{ A, B, C, D });

      var sublist = (from a in myList                
      from b in myList                
      where a.Text == b.Text                   
      && a.Id != b.Id                
      select a).Distinct();

      sublist.Dump();
}
public class myClass{  public int Id { get; set; }  public int Category { get; set; }  public string Text { get; set; }}

---

当有2个匹配项时有效，但当有更多匹配项时爆炸；因此，6个结果中有3个匹配结果，等等。@Marc-distinct添加到修复中：我投票选择这一个，它确实非常有效，目前我更喜欢查询语法，对我来说更容易理解：

void Main()
{

    myClass A = new myClass { Id=1, Category=1, Text="Hello World!"};
    myClass B = new myClass { Id=2, Category=2, Text="Hello World!"};
    myClass C = new myClass { Id=3, Category=2, Text="Good Bye!"};
    myClass D = new myClass { Id=4, Category=7, Text="Hello World!"};
    List<myClass> myList = new List<myClass>(); 
    myList.AddRange(new []{ A, B, C, D });

      var sublist = (from a in myList                
      from b in myList                
      where a.Text == b.Text                   
      && a.Id != b.Id                
      select a).Distinct();

      sublist.Dump();
}
public class myClass{  public int Id { get; set; }  public int Category { get; set; }  public string Text { get; set; }}