其中list包含列表之一

Question

我有和数组对象，它是

List<ContactModel> contactList;

public class ContactModel
{
    public string CustomKey { get; set; }
    public string[] ContactGroups { get; set; }
}

所以物体会是

{"1", {"Group A"} }
{"2", {"Group A", "Group B", "Group C"} }
{"3", {"Group C", "Group D"} }
{"4", {"Group A", "Group B", "Group C", "Group D"} }

ContactGroups包含给定联系人所在的组{“A组”、“B组”、“C组”、“D组”}的列表。我可以通过以下方法得到一个组的结果。

var selectedContracts =
    from contact in contacts
    where contact.ContactGroups.Contains("Group A")
    select new { contact.CustomKey, contact.ContactGroups };

是否有一种方法可以获得包含一个对象列表的所有对象的列表。

var selectedContracts =
    from contact in contacts
    where contact.ContactGroups.Contains("Group A", "Group B")
    select new { contact.CustomKey, contact.ContactGroups };

我要拿回物体1,2,4。

Answer 1

目标方法：

public static IEnumerable<ContactModel> SelectContacts(
        List<ContactModel> contacts, string[] targetGroups)
{
    return from contact in contacts
           where targetGroups.Any(targetGroup => 
                 contact.ContactGroups.Contains(targetGroup))
           select contact;
}

使用实例：

void Run()
{
    Initial();
    var selectedContacts = SelectContacts(contactList, 
      new[] { "Group A", "Group B" });
    PrintContacts(selectedContacts);
}

帮助方法：

void Initial()
{
    contactList = new List<ContactModel>
    {
        new ContactModel
        {
            CustomKey = "1",
            ContactGroups = new[] { "Group A" }
        },
        new ContactModel
        {
            CustomKey = "2",
            ContactGroups = new[] { "Group A", "Group B", "Group C" }
        },
        new ContactModel
        {
            CustomKey = "3",
            ContactGroups = new[] { "Group C", "Group D" }
        },
        new ContactModel
        {
            CustomKey = "4",
            ContactGroups = new[] { "Group A", "Group B", "Group C", "Group D" }
        },
    };
}

void PrintContacts(IEnumerable<ContactModel> contacts)
{
    foreach (var selectedContract in contacts)
        Console.WriteLine(selectedContract.CustomKey);
}

Answer 2

这将返回1、2和4：

var objects = new string[]  { "Group A", "Group B" };

var selectedContacts = contactList.Where(contact => objects
    .Any(obj => contact.ContactGroups.Contains(obj)));

Answer 3

不知道这是不是你要找的

测试：

    var contactList = new List<ContactModel> { new ContactModel {CustomKey = "1", ContactGroups = new[]{"Group A"} },
                                                new ContactModel {CustomKey ="2", ContactGroups = new[]{"Group A", "Group B", "Group C"} },
                                                new ContactModel {CustomKey ="3",ContactGroups = new[] {"Group C", "Group D"} },
                                                new ContactModel {CustomKey ="4", ContactGroups = new[]{"Group A", "Group B", "Group C", "Group D"}},
                                                new ContactModel {CustomKey ="5", ContactGroups = new[]{"Group A", "Group C", "Group D"}},
                                                new ContactModel {CustomKey ="6", ContactGroups = new[]{ "Group D"}},
                                                new ContactModel {CustomKey ="7", ContactGroups = new[]{"Group C"}},};

    var CheckFor = new List<string>{"Group A", "Group B"};

    var selectedContracts =
    from contact in contactList
    where contact.ContactGroups.Any(x => CheckFor.Contains(x))
    select new { contact.CustomKey, contact.ContactGroups };