c# - linq distinct 或 group by 多个属性

Question

如何使用 C# 和 Linq 从下一个列表中获取结果:

 var pr = new List<Product>()
   {
       new Product() {Title="Boots",Color="Red",    Price=1},
       new Product() {Title="Boots",Color="Green",  Price=1},
       new Product() {Title="Boots",Color="Black",  Price=2},

       new Product() {Title="Sword",Color="Gray", Price=2},
       new Product() {Title="Sword",Color="Green",Price=2}
   };

结果:

        {Title="Boots",Color="Red",  Price=1},               
        {Title="Boots",Color="Black",  Price=2},             
        {Title="Sword",Color="Gray", Price=2}

我知道我应该使用 GroupBy 或 Distinct，但了解如何获得所需的内容

   List<Product> result = pr.GroupBy(g => g.Title, g.Price).ToList(); //not working
   List<Product> result  = pr.Distinct(...);

请帮忙

Answer 1

它按需要的属性分组并选择:

List<Product> result = pr.GroupBy(g => new { g.Title, g.Price })
                         .Select(g => g.First())
                         .ToList();