c#

C#中怎么使用Intersect自定义对象列表

小亿
100
2024-04-02 10:01:58
栏目: 编程语言

在C#中使用Intersect方法对自定义对象列表进行交集操作,需要重写自定义对象的Equals和GetHashCode方法,以确保比较两个对象是否相等的准确性。

假设有一个自定义对象Person,包含属性Id和Name,示例代码如下:

public class Person
{
    public int Id { get; set; }
    public string Name { get; set; }

    public override bool Equals(object obj)
    {
        if (obj == null || GetType() != obj.GetType())
        {
            return false;
        }

        Person other = (Person)obj;
        return Id == other.Id && Name == other.Name;
    }

    public override int GetHashCode()
    {
        return Id.GetHashCode() ^ Name.GetHashCode();
    }
}

然后创建两个Person对象列表,使用Intersect方法找到它们的交集:

List<Person> list1 = new List<Person>
{
    new Person { Id = 1, Name = "Alice" },
    new Person { Id = 2, Name = "Bob" },
    new Person { Id = 3, Name = "Charlie" }
};

List<Person> list2 = new List<Person>
{
    new Person { Id = 2, Name = "Bob" },
    new Person { Id = 3, Name = "Charlie" },
    new Person { Id = 4, Name = "David" }
};

var intersectList = list1.Intersect(list2).ToList();

foreach (var person in intersectList)
{
    Console.WriteLine(person.Id + " " + person.Name);
}

以上代码将输出:

2 Bob
3 Charlie

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