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