Remove duplicate items from list in C#, according to one of their properties

Question

I have list of class of type:

public class MyClass
{        
    public SomeOtherClass classObj;         
    public string BillId;           
}

public List<MyClass> myClassObject;

Sample Values:

BillId = "123",classObj = {},
BillId = "999",classObj = {},
BillId = "777",classObj = {},
BillId = "123",classObj = {}

So in above example, we have duplicate values for BillId. I would like to remove all the duplicate values (Not Distinct) so the result would contain only 999 & 777 value.

One way to achieve this to

• Loop through all items
• Get count of unique BillId
• If count is greater than 1, store that BillId in another variable
• Loop again and remove item based on BillId

Is there any straightforward way to achieve this?

Answer 1

I think this would work:

var result = myClassObject.GroupBy(x => x.BillId)
    .Where(x => x.Count() == 1)
    .Select(x => x.First());

Fiddle here