C# LINQ与查询不同

我有两个类的简单代码：

    public class Contact
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
        public DateTime DateOfBirth { get; set; }
        public string State { get; set; }
    }


    public class CallLog
    {
        public string Number { get; set; }
        public int Duration { get; set; }
        public bool Incoming { get; set; }
        public DateTime When { get; set; }
    }

现在在两个类中，我有了静态方法：SampleData（），在这里我从源（SQL Server-返回列表）获取所有数据

我的代码：

List<Contact> contacts = Contact.SampleData();
List<CallLog> callLogs = CallLog.SampleData();

看起来不错吧

更好的查询：

var query = from contact in contacts
                        join callLog in callLogs on contact.Phone equals callLog.Number
                        group contact by new {contact.FirstName, contact.LastName, contact.Phone} into g
                        select new
                        {
                            owner = g.Key.FirstName + " " + g.Key.LastName,
                            inComming = callLogs.Where(c=>c.Number == g.Key.Phone && c.Incoming == true).Count(),
                            outGoing = callLogs.Where(c=>c.Number == g.Key.Phone && c.Incoming == false).Count()

---

这将按

号码组织您的通话记录，然后为您提供该特定号码的所有传入/传出通话的列表。
显示
SampleData（）的定义。
您的问题是什么？您想要输入
incomming=true
的数字吗？？而
CallLog
和
Contact
之间的链接是什么呢？Contact.Phone=CallLog.Number是的，我想要传入=true和传入=false。SampleDate return simpleList，它返回列表和列表，但我会得到更多的所有者名称，它们存在于列表中（CallLog.Number=Contact.Phone）@cniak请参见更新，您可以使用
GroupJoin
。
var query = from contact in contacts
                        join callLog in callLogs on contact.Phone equals callLog.Number
                        group contact by new {contact.FirstName, contact.LastName, contact.Phone} into g
                        select new
                        {
                            owner = g.Key.FirstName + " " + g.Key.LastName,
                            inComming = callLogs.Where(c=>c.Number == g.Key.Phone && c.Incoming == true).Count(),
                            outGoing = callLogs.Where(c=>c.Number == g.Key.Phone && c.Incoming == false).Count()

var callsByContact = contacts.GroupJoin(callLogs, 
    c => c.Phone, 
    l => l.Number,
    (c, calls) => new { 
        Contact = c, 
        IncomingCalls = calls.Where(x => x.Incoming).ToList(), 
        OutgoingCalls = calls.Where(x => !x.Incoming).ToList()
    });