C# 从集合A中取出集合B中不包含的数据(根据ID判断)，并添加到集合B中

从一个集合A中取出另一个集合B中不包含的数据，并添加到集合B中

 private void button2_Click(object sender, EventArgs e)
 {
     var ListA = new List<student>();
     ListA.Add(new student() { name = "张三", subject = "英语", score =  });
     ListA.Add(new student() { name = "李四", subject = "英语", score =  });
     ListA.Add(new student() { name = "王五", subject = "英语", score =  });
     ListA.Add(new student() { name = "李倩", subject = "英语", score =  });

     var ListB = new List<student>();
     ListB.Add(new student() { name = "李四", subject = "英语", score =  });
     ListB.Add(new student() { name = "王五", subject = "数学", score =  });
     ListB.Add(new student() { name = "赵六", subject = "数学", score =  });

     //使用Exists同样可以实现 字面上应该更好理解，而且效率要高些
     //从ListB中查找ListA中不包含的数据,根据name判断
     var exp2 = ListB.Where(a => !ListA.Exists(t => a.name.Contains(t.name))).ToList() as  List<student>;

     ListA.AddRange(exp2);

 }

Student类如下:

 public class student
 {
     /// <summary>
     /// 姓名
     /// </summary>
     public string name;
     /// <summary>
     /// 科目
     /// </summary>
     public string subject;
     /// <summary>
     /// 分数
     /// </summary>
     public int score;
 }