56 lines
1.5 KiB
C#
56 lines
1.5 KiB
C#
namespace ConsoleAppTest
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{
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public struct AFS
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{
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public int x;
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public int y;
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public string Name;
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}
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internal class Program
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{
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static void Main(string[] args)
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{
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List<Com> l = new List<Com>()
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{
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new Com(){id=1,Name="boolive"},
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new Com(){id=2,Name="boolive"}
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};
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List<Com> l1 = new List<Com>()
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{
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new Com(){id=1,Name="boolive"},
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new Com(){id=3,Name="boolive"}
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};
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var DDD= l1.Except(l).ToList();
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var DDD1= l.Except(l1).ToList();
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List<Product> lll = new List<Product>()
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{
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new Product{id=1,ComId=1},
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new Product{id=2,ComId=2},
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new Product{id=3,ComId=3},
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};
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var str = l.Where(s => s.Name.StartsWith("JavaScript")).DefaultIfEmpty().First();
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Console.WriteLine("str=" + str.Name); //输出空白
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//使用string str1 = ListInt.Where(s => s.StartsWith("JavaScript")).First(); 如去掉DefaultEmpty就会报异常
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Console.WriteLine("Hello, World!");
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}
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}
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public struct Com
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{
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public int id { get; set; }
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public string Name { get; set; }
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}
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public class Product
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{
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public int id { get; set; }
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public int ComId { get; set; }
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public string Name { get; set; }
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}
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}
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