linq string.contains在子对象列表的字段上 [英] linq string.contains on field of child object list

问题描述

如何更改此处的linq语句，以便找到包含用户的公司(子字符串为"third")的公司?

How can the linq statement here be altered so that it finds the company(s) containing the user with the substring of "third"?

目前，它仅在搜索完整的用户名(即contains(第三用户"))时有效，因为它正在搜索列表中的匹配项，而不是字符串.

At the moment it only works when searching for the full user name i.e. contains("third user") because it is searching for a match in the list, not the string.

class Company
{
    public Company(List<User> users) { this.Users = users; }
    public List<User> Users { get; set; }
}

class User
{
    public User(string name) { this.Name = name; }
    public string Name { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        List<Company> companies = new List<Company>();
        Company company1 = new Company(new List<User>(){ new User("first user"), new User("second user") });
        Company company2 = new Company(new List<User>() { new User("third user"), new User("fourth user") });
        companies.Add(company1);
        companies.Add(company2);

        companies = companies
                            .Where(company => company.Users.Select(user => user.Name)
                            .Contains("third")).ToList();
    }
}

推荐答案

您应致电 string.Contains :

You should call string.Contains on the user.Name:

companies = companies
    .Where(company => company.Users.Any(user => user.Name.Contains("third")))
    .ToList();

查看其在线运行情况: ideone

See it working online: ideone

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