C# 如何显示我的对象'；谁的数据？

这是我的密码：

public class Restaurant {
    public int ID { get; set; }
    public int DOHVisits { get; set; }
    public int QtyComplaints { get; set; }
    public List<Complaint> Complaints = new List<Complaint>();
}

public class Complaint {
    public string Name; { get; set; }
    public string Address; { get; set; }
    public string Description; { get; set; }
    public DateTime ComplaintDate; { get; set; }
}

void Main() {
    List<Restaurant> RestaurantData = new List<Restaurant>();
}

---

上述代码的问题在于，它排除了所有投诉为0的餐厅。我希望包括投诉为零的餐厅，并让它们显示在数据网格中

首先，我声明实现GridView的每个数据行的类：

class ResultLine
{
    public int? ID { get; set; }
    public int? DOHVisits { get; set; }
    public int? QtyComplaints { get; set; }
    public string ComplaintName { get; set; }
    public string ComplaintAddress { get; set; }
    public string ComplaintDescription { get; set; }
    public DateTime? ComplaintDate { get; set; }
}

查询可以写为：

IEnumerable<ResultLine> lines = RestaurantData.OrderByDescending(x => x.DOHVisits)
    .SelectMany(r => new List<ResultLine>() {
        new ResultLine() {
            ID = r.ID,
            DOHVisits = r.DOHVisits,
            QtyComplaints = r.QtyComplaints,
            ComplaintName = null,
            ComplaintAddress = null,
            ComplaintDescription = null,
            ComplaintDate = null
        }
    }.Concat(r.Complaints.OrderBy(c => c.ComplaintDate).Select(c => new ResultLine() {
        ID = null,
        DOHVisits = null,
        QtyComplaints = null,
        ComplaintName = c.Name,
        ComplaintAddress = c.Address,
        ComplaintDescription = c.Description,
        ComplaintDate = c.ComplaintDate
    })));

IEnumerable lines=RestaurantData.OrderByDescending（x=>x.DOHVisits）
.SelectMany（r=>newlist（）{
新结果行（）{
ID=r.ID，
DOHVisits=r.DOHVisits，
QtyComplaints=r.QtyComplaints，
ComplaintName=null，
投诉地址=null，
ComplaintDescription=null，
ComplaintDate=null
}
}.Concat（r.Complaints.OrderBy（c=>c.ComplaintDate）。选择（c=>newresultline（））{
ID=null，
DOHVisits=null，
QtyComplaints=null，
投诉名称=c.名称，
投诉地址=c.地址，
投诉描述=c.描述，
ComplaintDate=c.ComplaintDate
})));

我已编辑了您的标题。请参阅“”，其中的共识是“不，他们不应该”。

IEnumerable<ResultLine> lines = RestaurantData.OrderByDescending(x => x.DOHVisits)
    .SelectMany(r => new List<ResultLine>() {
        new ResultLine() {
            ID = r.ID,
            DOHVisits = r.DOHVisits,
            QtyComplaints = r.QtyComplaints,
            ComplaintName = null,
            ComplaintAddress = null,
            ComplaintDescription = null,
            ComplaintDate = null
        }
    }.Concat(r.Complaints.OrderBy(c => c.ComplaintDate).Select(c => new ResultLine() {
        ID = null,
        DOHVisits = null,
        QtyComplaints = null,
        ComplaintName = c.Name,
        ComplaintAddress = c.Address,
        ComplaintDescription = c.Description,
        ComplaintDate = c.ComplaintDate
    })));