映射值的C#字典
我在对象报告模型中存储了一组数据,如下所示:映射值的C#字典,c#,.net,linq,C#,.net,Linq,我在对象报告模型中存储了一组数据,如下所示: public class ReportModel { public List<CarListingModel> CarListings {get; set;} } public class CarListingModel { public long CarId {get; set;} public long OwnerId {get; set;} public string CarColor {get; set;
public class ReportModel
{
public List<CarListingModel> CarListings {get; set;}
}
public class CarListingModel
{
public long CarId {get; set;}
public long OwnerId {get; set;}
public string CarColor {get; set;}
}
public class GroupedListingModel
{
public long OwnerId {get; set;}
public int TotalCarCount {get; set;}
public string CarColors {get; set;}
}
var list = someData.Where(...).Select(l => new CarListingModel
{
CarId = l.CarId,
OwnerId = l.OwnerId,
CarColor = l.Color
});
我用来获取每个OwnerId对应的TotalCarCount的代码如下所示:
var result = list.GroupBy(p=> p.OwnerId, p=> p.CarId, (key, g) => new GroupedListingModel {
OwnerId = key,
TotalCarCount = g.Count()
}).ToList();
但是,我想做的是返回一个键值对,其中包含多个属性的对象中的值,例如,汽车数量和汽车颜色列表。类似这样的事情(显然不起作用):
我尝试以不同的方式创建分组列表模型,如下所示,但不确定我是否走上了正确的道路:
public class GroupedListingModel_2
{
public long OwnerId {get; set;}
public DetailsModel Details {get; set;}
}
public class DetailsModel
{
public int TotalCarCount {get; set;}
public string CarColors {get; set;}
}
现在我在想,这些数据作为字典的结构会更好,但我还是不确定如何从“列表”中得到我想要的结果
var result = list.GroupBy(p => p.OwnerId, (key, g) => new GroupedListingModel
{
OwnerId = key,
TotalCarCount = g.Count(),
CarColors = string.Join(", ", g.Select(x => x.CarColor).Distinct().OrderBy(x => x)),
}).ToList()
但要保持数据结构化,您可以稍微更改模型:
public class GroupedListingModel
{
public long OwnerId { get; set; }
public int TotalCarCount { get; set; }
public IEnumerable<string> CarColors { get; set; }
}
但要保持数据结构化,您可以稍微更改模型:
public class GroupedListingModel
{
public long OwnerId { get; set; }
public int TotalCarCount { get; set; }
public IEnumerable<string> CarColors { get; set; }
}
CarColors = g.Select(x => x.CarColor)