1.首先在該名稱空間下建立一個實體,和在Main方法下List集合,為後續做準備:
/// <summary> /// 實體 /// </summary> public class Student { public int ID { get; set; } public string Name { get; set; } public int Age { get; set; } public string Location { get; set; } public string Hobby { get; set; } }
//建立一個List集合 List<Student> Students = new List<Student>(); //新增資料 Students.Add(new Student() { ID=1, Name="豬豬俠", Age=12, Location="長沙", Hobby = "打怪" }); Students.Add(new Student() { ID = 2, Name = "貓咪", Age = 15, Location = "株洲", Hobby = "打球" }); Students.Add(new Student() { ID = 3, Name = "大象", Age = 34, Location = "邵陽", Hobby = "抽血" }); Students.Add(new Student() { ID = 4, Name = "猴子", Age = 32, Location = "醴陵", Hobby = "吃香蕉" }); Students.Add(new Student() { ID = 5, Name = "鴨子", Age = 30, Location = "山西", Hobby = "吃蚯蚓" });
第一種方法:使用Random隨機數區取出其中一個
//建立隨機數,並在集合總數中隨機取出一個 int r = new Random().Next(Students.Count); //隨機列印輸出 Console.WriteLine($"ID:{Students[r].ID}--姓名:{Students[r].Name}");
第二種方法:使用GUID進行隨機排序。
//使用GUID隨機排序找出第一個 Student stu = Students.OrderBy(u => Guid.NewGuid()).First(); //列印輸出 Console.WriteLine($"ID:{stu.ID}--姓名:{stu.Name}");