[英]Merge two DataTables with LINQ
我的問題也是類似THIS
我有兩個數據表:
數據表1:
Column 1: Date
Column 2: Requests 1
數據表2:
Column 1: Date
Column 2: Requests 2
我需要以下結果:
新數據表:
Column 1: Date
Column 2: Requests 1
Column 3: Requests 2
預期結果:
Date Requests 1 Requests 2 Total
15/08/2013 25 40 60
14/08/2013 40 60 100
13/08/2013 40 0 25
12/08/2013 0 80 80
到目前為止,我所做的是:
DataTable Lista_1 = ds.Tables[0];
DataTable Lista_2 = ds.Tables[1];
var myLINQ = from l1 in Lista_1.AsEnumerable()
join l2 in Lista_2.AsEnumerable()
on l1.Field<DateTime>("Date") equals l2.Field<DateTime>("Date")
select new
{
dateRelatorio = l1.Field<DateTime>("Date"),
request1Relatorio = l1.Field<int>("Total"),
request2Relatorio = l2.Field<int>("contagem"),
total = l1.Field<int>("Total") + l2.Field<int>("contagem")
};
我想返回一個IList集合(System.Collections.IList)
UPDATE
listReturn = new List<Stats>();
public class Stats
{
public DateTime dateRelatorio { get; set; }
public int request1Relatorio { get; set; }
public int request2Relatorio { get; set; }
public int total { get; set; }
}
更新2
List_1中的日期可能沒有List_2中的日期,反之亦然,因此“請求”必須為0。
如果需要將此東西封裝在方法中,則應創建一個要返回的類:
public class DailyReport
{
public DateTime Date {get; set;}
public int Requests1 {get; set;}
public int Requests2 {get; set;}
public int Total // this can be calculated on the fly
{
get {return Requests1 + Requests2; }
}
}
然后做
public List<DailyReport> GetDailyReports(..parameters if needed...)
{
...
var myLINQ = from ...
select new DailyReport {
Date = l1.Field<DateTime>("Date"),
Requests1 = l1.Field<int>("Total"),
Requests2 = l2.Field<int>("contagem"),
};
return myLINQ.ToList();
}
有一些骯臟的技巧可以使您返回匿名對象的集合,但是我建議您不要這樣做。
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