linq string.contains on field of child object list

问题

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

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();
    }
}

回答1:

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

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

See it working online: ideone

来源：https://stackoverflow.com/questions/8429232/linq-string-contains-on-field-of-child-object-list