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 = 89 });
    ListA.Add(new student() { name = "李四", subject = "英语", score = 951 });
    ListA.Add(new student() { name = "王五", subject = "英语", score = 69 });
    ListA.Add(new student() { name = "李倩", subject = "英语", score = 99 });

    var ListB = new List<student>();
    ListB.Add(new student() { name = "李四", subject = "英语", score = 95 });
    ListB.Add(new student() { name = "王五", subject = "数学", score = 69 });
    ListB.Add(new student() { name = "赵六", subject = "数学", score = 100 });

    //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;
}