List<T>Distinct 过滤

public class TestDuplicateDefine : IEqualityComparer<student>
    {
        public bool Equals(student x, student y)
        {
            return x.name == y.name;
        }
 
        public int GetHashCode(student obj)
        {
            return obj.ToString().GetHashCode();
        }
    }
 
    public class student
    {
        public string name { get; set; }
        public int id { get; set; }
    }

private void button1_Click(object sender, EventArgs e)
        {
            List<student> list = new List<student>();
            list.Add(new student { name = "", id =  });
            list.Add(new student { name = "", id =  });
            list.Add(new student { name = "", id =  });
            list.Add(new student { name = "", id =  });
 
            List<student> aa = list.Distinct(new TestDuplicateDefine()).ToList();
        }