C＃Linq .Distinct（）方法不起作用

Question

C＃Linq Distinct最近是否已停止工作？ 几个月前，它现在的工作就像一个魅力，但事实并非如此。例如，当我尝试这样做时

Product[] products = { new Product { Name = "apple", Code = 9 }, 
                   new Product { Name = "orange", Code = 4 }, 
                   new Product { Name = "apple", Code = 9 }, 
                   new Product { Name = "lemon", Code = 12 } };

IEnumerable<Product> noduplicates =
products.Distinct();
foreach (var product in noduplicates)
Console.WriteLine(product.Name + " " + product.Code);

This code should produce the following output:
apple 9 
orange 4
lemon 12

但它会产生以下输出：     苹果9     橙色4     苹果9     柠檬12