C#怎么从List集合中删除某个元素？

1.首先在该命名空间下创建一个实体，和在Main方法下List集合，为后续做准备：

/// <summary> /// 实体 /// </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; } }

//创建一个List集合 List<Student> Students = new List<Student>(); //添加数据 Students.Add(new Student() { ID=1, Name="猪猪侠", Age=12, Location="长沙", Hobby = "打怪" }); Students.Add(new Student() { ID = 2, Name = "猫咪", Age = 15, Location = "株洲", Hobby = "打球" }); Students.Add(new Student() { ID = 3, Name = "大象", Age = 34, Location = "邵阳", 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 = "鸭子", Age = 30, Location = "山西", Hobby = "吃蚯蚓" });

 

一、【错误演示】：有很多人会使用遍历，但是顺序遍历会导致删除不完整

 for (int i = 0; i <= Students.Count; i++) {
     Students.Remove(Students[i]);
     //Students.RemoveAt(i);
     //Students.RemoveRange(i, 1);
 }
foreach (var item in Students) {
     Console.WriteLine($"ID：{item.ID}--Name：{item.Name}--Age：{item.Age}--Location：{item.Location}--Hpbby：{item.Hobby}");
}

//没有按照预想的删除完成

 

二、【正确演示】：使用倒序遍历

 //【正确演示】
for (int i = Students.Count-1; i >= 0; i--) {
      Students.Remove(Students[i]);
}
foreach (var item in Students)
{
      Console.WriteLine($"ID：{item.ID}--Name：{item.Name}--Age：{item.Age}--Location：{item.Location}--Hpbby：{item.Hobby}");
}

//能看到完全删除了