C# List应用 Lambda 表达式

#参考链接： https://blog.csdn.net/wori/article/details/113144580

首先 => 翻译为{ }

然后没有然后

###主要基于我工作中常用的几种情况，写个小例子：

这个Java叫实体类，C#不知道叫啥

<code-pre class="code-pre" id="pre-ZFbhAY"><code-line class="line-numbers-rows"></code-line> public class Zoo
<code-line class="line-numbers-rows"></code-line>    {
<code-line class="line-numbers-rows"></code-line>        public int ID { get; set; }
<code-line class="line-numbers-rows"></code-line>        public string Name { get; set; }
<code-line class="line-numbers-rows"></code-line>        public string Type { get; set; }
<code-line class="line-numbers-rows"></code-line>        public int Location { get; set; }
<code-line class="line-numbers-rows"></code-line>        public float Money { get; set; }
<code-line class="line-numbers-rows"></code-line>
<code-line class="line-numbers-rows"></code-line>        public Zoo(int iD, string name, string type, int location, float money)
<code-line class="line-numbers-rows"></code-line>        {
<code-line class="line-numbers-rows"></code-line>            ID = iD;
<code-line class="line-numbers-rows"></code-line>            Name = name;
<code-line class="line-numbers-rows"></code-line>            Type = type;
<code-line class="line-numbers-rows"></code-line>            Location = location;
<code-line class="line-numbers-rows"></code-line>            Money = money;
<code-line class="line-numbers-rows"></code-line>        }
<code-line class="line-numbers-rows"></code-line>    }
</code-pre>

　　然后测试几种情况：

<code-pre class="code-pre" id="pre-e5MDJX"><code-line class="line-numbers-rows"></code-line>static void Main()
<code-line class="line-numbers-rows"></code-line>        {
<code-line class="line-numbers-rows"></code-line>
<code-line class="line-numbers-rows"></code-line>            List<Zoo> lists = new List<Zoo>();
<code-line class="line-numbers-rows"></code-line>            Zoo z = new Zoo(001, "tiger", "Tiger", 21, 50);
<code-line class="line-numbers-rows"></code-line>            Zoo z1 = new Zoo(002, "tiger1", "Tiger", 21, 20);
<code-line class="line-numbers-rows"></code-line>            Zoo z2 = new Zoo(003, "tiger3", "Tiger", 21, 30);
<code-line class="line-numbers-rows"></code-line>            Zoo z3 = new Zoo(004, "tiger4", "Cat", 22, 40);
<code-line class="line-numbers-rows"></code-line>            Zoo z4 = new Zoo(005, "cat", "Cat", 22, 70);
<code-line class="line-numbers-rows"></code-line>            Zoo z5 = new Zoo(006, "lion", "BigStone", 20, 40);
<code-line class="line-numbers-rows"></code-line>            lists.Add(z);
<code-line class="line-numbers-rows"></code-line>            lists.Add(z1);
<code-line class="line-numbers-rows"></code-line>            lists.Add(z2);
<code-line class="line-numbers-rows"></code-line>            lists.Add(z3);
<code-line class="line-numbers-rows"></code-line>            lists.Add(z4);
<code-line class="line-numbers-rows"></code-line>            lists.Add(z5);
<code-line class="line-numbers-rows"></code-line>
<code-line class="line-numbers-rows"></code-line>            //挑出其中的符合要求的：我这里写死要求为3、4、5
<code-line class="line-numbers-rows"></code-line>            List<Zoo> tigers = lists.FindAll(x =>x.ID>2&&x.ID<6);
<code-line class="line-numbers-rows"></code-line>            foreach (var item in tigers)
<code-line class="line-numbers-rows"></code-line>            {
<code-line class="line-numbers-rows"></code-line>                Console.WriteLine(item.ID+"\t"+item.Name);
<code-line class="line-numbers-rows"></code-line>            }
<code-line class="line-numbers-rows"></code-line>
<code-line class="line-numbers-rows"></code-line>            //挑出符合要求且返回新集合，此处测试返回string列表
<code-line class="line-numbers-rows"></code-line>            //Where 中为bool类型表达式
<code-line class="line-numbers-rows"></code-line>            //Select 中为需要的形式： 如下面要返回Zoo，而不是string， 则 Select(e=>e)
<code-line class="line-numbers-rows"></code-line>            //最后的ToList是确定返回类型，根据实际需要
<code-line class="line-numbers-rows"></code-line>            List<string> zoos = lists.Where(x => (x.Money + 10) < 70).Select(e=>e.Name).ToList();
<code-line class="line-numbers-rows"></code-line>            foreach (var item in zoos)
<code-line class="line-numbers-rows"></code-line>            {
<code-line class="line-numbers-rows"></code-line>                Console.WriteLine(item);
<code-line class="line-numbers-rows"></code-line>            }
<code-line class="line-numbers-rows"></code-line>            
<code-line class="line-numbers-rows"></code-line>            //返回单个符合要求的
<code-line class="line-numbers-rows"></code-line>            Console.WriteLine(lists.Find(x => x.Money==40 && x.Name.Contains("ger")).Type);
<code-line class="line-numbers-rows"></code-line>        }
</code-pre>

结果：

3    tiger3
4    tiger4
5    cat
tiger
tiger1
tiger3
tiger4
lion
Cat

__EOF__

本文作者：echo_lovely
本文链接：https://www.cnblogs.com/echo-lovely/articles/14419737.html
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