Linq GroupBy去重

List<Product> products =  new  List<Product>()

{

     new  Product(){ Id= "1" , Name= "n1" },

     new  Product(){ Id= "1" , Name= "n2" },

     new  Product(){ Id= "2" , Name= "n1" },

     new  Product(){ Id= "2" , Name= "n2" },

};

 

var  result = products.GroupBy(p => p.Id).Select(

     p=> new

     {

         Id=p.Key,

         Name=p.FirstOrDefault().Name

     });

result.ToList().ForEach(v =>

     {

         Console.WriteLine(v.Id +  ":"  + v.Name);

     });