linq 不同或按多个属性分组 [英] linq distinct or group by multiple properties

问题描述

如何使用 c# 和 Linq 从下一个列表中获取 result:

How can I using c# and Linq to get a result from the next list:

 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

I know that I should use GroupBy or Distinct, but understand how to get what is needed

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

请帮忙

推荐答案

按需要的属性分组并选择:

It's groups by needed properties and select:

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

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