当我使用Distinct()时，Linq代码有错误

var distinctItems = items.GroupBy(item => item.PropertyName)
                         .Select(group => group.First())
                         .ToList();

public class MyObjectComparer : IEqualityComparer<MyObject>
{
    public bool Equals(MyObject x, MyObject y)
    {
        return x.PropertyName == y.PropertyName;
    }

    public int GetHashCode(MyObject obj)
    {
        return obj.PropertyName.GetHashCode();
    }
}

// 使用自定义比较器
var distinctItems = items.Distinct(new MyObjectComparer()).ToList();

public class Person
{
    public int Id { get; set; }
    public string Name { get; set; }
}

// 假设people是一个包含重复Id的Person列表
var people = new List<Person> { ... };

// 使用GroupBy去重
var distinctPeople = people.GroupBy(p => p.Id)
                           .Select(g => g.First())
                           .ToList();

// 或者使用自定义比较器
var distinctPeople2 = people.Distinct(new PersonComparer()).ToList();