遍历列表元素
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ForEachDemo { class Program { static void Main(string[] args) { Console.WriteLine(LambdaAndEach()); //输出:‘1‘,‘4‘,‘5‘,‘6‘,‘7‘,‘8‘,‘9‘,‘10‘ Console.ReadKey(); } public static string LambdaAndEach() { //数据源 var retList = new List<int>() { 1, 4, 5, 6, 7, 8, 9, 10 }; var sbBuilder = new StringBuilder(); retList.ForEach(item => { //如果是最后一个元素则用(‘item‘)包裹,否则用(‘item‘,)包裹元素 if (item == retList[retList.Count - 1]) { sbBuilder.Append("‘" + item + "‘"); } else { sbBuilder.Append("‘" + item + "‘,"); } }); return sbBuilder.ToString(); } } }
例二:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApplication1 { class User { public Guid Id { get; set; } public string UserName { get; set; } public string Pwd { get; set; } } class Program { static void Main(string[] args) { //数据源 var dataSource = new List<User>() { new User() {Id = Guid.NewGuid(), UserName = "admin", Pwd = "123"}, new User() {Id = Guid.NewGuid(), UserName = "zhang", Pwd = "345"}, new User() {Id = Guid.NewGuid(), UserName = "liu", Pwd = "999"} }; var uids = dataSource.Select(u => u.Id.ToString()); Console.WriteLine("所有用户ID,用空格|隔开\n{0}", string.Join(" | ", uids)); //输出:所有用户ID,用空格|隔开 //44927238 - 8ce7 - 4581 - 91ec - 4797712dc85a | 116037c7 - 4275 - 4491 - 9a2a - afb887ea2cf0 | 2c157abc - 8f13 - 4394 - b5e3 - 4778a9a420df Console.ReadKey(); } } }
时间: 2024-09-29 17:45:28