根据 C#/LINQ 中对象列表的相似值属性检查属性是否唯一

Question

I saw many almost similar scenarios asked, but couldn't find a solution satisfying my need. I have a list of object and in that list, I want to get objects that has similar/duplicate property but with different value for another property in that object. For instance,

List<Emp> :

Emp.CubeNo      Emp.EmpId
------------------------------

A1                ABC    // get this
B1                XYZ
A1                EFG    // get this   
B2                XXZ

Similar to the case in the above example; assuming each employee has a unique CubeNo, I want to find the CubeNo assigned to multiple employees.

I am able to get the result with the following query; but I'm sure there is much more elegant way to achieve this. Appreciate all the suggestions..

var idealList = (from g1 in Emp
   join g2 in Emp on g1.CubeNo equals g2.CubeNo 
        where g1.EmpId  != g2.EmpId  
        select new
        {
           Property1 = g1.EmpId ,
           Property2 = g2.CubeNo  
        }).ToList();

Answer 1

ListOfObject.GroupBy(x=>x.Property1)
              .Where(x=>x.Count()>1)
              .Select(x=>x.GroupBy(y=>y.Property2)
              .Where(t=>t.Count()==1))
              .Where(x=>x.Any())
              .SelectMany(x=>x.SelectMany(t=>t))

With sample class i have:

public class Class1
{
    public string Property1 {get;set;}
    public string Property2 {get;set;}
}

var ListOfObject = new List<Class1>
{
    new Class1{Property1 = "A1", Property2 = "X1"},
    new Class1{Property1 = "B1", Property2 = "Y1"},
    new Class1{Property1 = "A1", Property2 = "Z1"},
    new Class1{Property1 = "B1", Property2 = "Y1"},
};