第一次发博。 - -
刚无聊看到群里一位朋友在提问，大晚上没人解答，遂自己默默打开了VS，敲起了代码。
问题：请问怎么将集合newFoods中Name含有"包子"的Number+1，LINQ可以一句话写出来 ?
List<Food> newFoods = new List<Food>{ new Food { Money = 10, Name = "天津包子", Number=1 }, new Food { Money = 10, Name = "狗不理包子", Number = 1 }, new Food { Money = 10, Name = "小笼包子", Number = 1 }, new Food { Money = 10, Name = "馒头", Number = 1 }, new Food { Money = 10, Name = "粽子", Number = 1 } };
我先是敲了一下正常的写法，很快出来了。
但是用Linq一直不知道该怎么写，反而越写越麻烦，还想出准备先筛选出一个对象，再把两个对象合并的傻办法。
后来发现原来select里是可以直接查询完返回原对象的。之前用Linq一直以为只能是 model.Select(o=>o.property==xxx) 这样用，也没去深究，看来是修为不够。
最后的代码：
1 #region 2 public class Food 3 { 4 public string Name { get; set; } 5 public int Money { get; set; } 6 public int Number { get; set; } 7 } 8 static void Example1() 9 { 10 List<Food> newFoods = new List<Food>{ 11 new Food { Money = 10, Name = "天津包子", Number=1 }, 12 new Food { Money = 10, Name = "狗不理包子", Number = 1 }, 13 new Food { Money = 10, Name = "小笼包子", Number = 1 }, 14 new Food { Money = 10, Name = "馒头", Number = 1 }, 15 new Food { Money = 10, Name = "粽子", Number = 1 } 16 }; 17 //Linq写法 18 newFoods = newFoods.Select(o => 19 { 20 o.Number = o.Name.Contains("包子") ? o.Number + 1 : o.Number; 21 return o; 22 }).ToList(); 23 //普通写法 24 for (int i = 0; i < newFoods.Count; i++) 25 { 26 newFoods[i].Number = newFoods[i].Name.Contains("包子") ? newFoods[i].Number + 1 : newFoods[i].Number; 27 } 28 //遍历输出 29 foreach (Food food in newFoods) 30 { 31 Console.WriteLine("名称：" + food.Name + ",价格：" + food.Money + ",数量：" + food.Number); 32 } 33 Console.ReadLine(); 34 } 35 #endregion
原文：http://www.cnblogs.com/simendancer/p/4741141.html