c＃追加新項目列表項

Question

下面的代碼有一個列表中有兩行，我想能夠合併兩條線，並基於國家的收入總和。

public class City 
{ 
public string Name {get;set;} 
public string Country {get;set;} 
public double income {get;set;} 
} 
public class myClass 
{ 
void Main() 
{ 

var c = GetCities(); 
var d = c.GroupBy(s => new {s.Country, s.Flag, s.Name}).Select(s => new City { Country = s.Key.Country, Flag = s.Key.Flag, Name = s.Key.Name}); 
d.Dump(); //LINQPAD output to screen 
} 

public List<City> GetCities() 
{ 
List<City> cities = new List<City>(); 
cities.Add(new City() { Name = "Istanbul", income= 22.00, Country = "Turkey" }); 
cities.Add(new City() { Name = "", income= 44.88, Country = "Turkey" }); 
return cities; 
} 
} 

在我的真實應用程序中，列表正在兩個地方生成，但數據需要在一行中顯示。

Answer 1

發現我的答案

var result = c.GroupBy(x => x.Country) 
.Select(g => { 
var item = g.First(); 
return new{ 
Country = item.Country, 
Name = item.Name, 
income = g.Sum(x => x.income) }; 
}).ToList();