Datatable Linq GroupBy，Aggregate Count

Question

我有一個數據表，其中包含下面的數據。我希望它通過代碼，名稱，地區和月份分組 然後獲得使用LINQ的covcode =（ip或OP）每月的計數。

Code Name    Region  Month CovCode 
6018 Provider - ONE  REGION2  1 OP 
6018 Provider - ONE  REGION2  1 IP 
6019 Provider - TWO  REGION3  2 OP 
6019 Provider - TWO  REGION3  2 IP 
6020 Provider - THREE REGION4  3 IP 
6020 Provider - THREE REGION4  3 IP 
6020 Provider - THREE REGION4  3 OP 

我想應該是這樣的結果：

Code Name    Region  MONTH1 IP OP MONTH2 IP OP MONTH3 IP OP 
6018 Provider - ONE  REGION2  2 1 1  0 0 0  0 0 0 
6019 Provider - TWO  REGION3  0 0 0  2 1 1  0 0 0 
6020 Provider - THREE REGION4  0 0 0  0 0 0  3 2 1 

這是我使用的返回不正確的結果LINQ。

var hospital = 
    from hosp in tblClaimsMain.AsEnumerable()   
    group hosp by hosp["ProviderCode"] into grp 
    select new 
    { 
      ProviderCode = grp.Select(g => g["CODE"].ToString()).FirstOrDefault(), 
     ProviderName = grp.Select(g => g["NAME"].ToString()).FirstOrDefault(), 
     Region = grp.Select(g => g["REGION"].ToString()).FirstOrDefault(), 
      MONTH1 = grp.Select(g => g["MONTH"].ToString() == "1").Count(), 
      MONTH2 = grp.Select(g => g["MONTH"].ToString() == "2").Count(), 
      MONTH3 = grp.Select(g => g["MONTH"].ToString() == "3").Count() 

    }; 

編輯：

您好，我現在能拿到每月計數，而另一方面，我仍然有越來越每covcode每月的計數問題。我用下面的linq。

var hospital = 
from hosp in tblClaimsMain.AsEnumerable()   
group hosp by new{CODE=hosp["CODE"],NAME=hosp["NAME"],REGION=hosp["REGION"]} into grp 
select new 
{ 
     ProviderCode = grp.Key.CODE, 
     ProviderName = grp.Key.NAME, 
     Region = grp.Key.REGION, 
     MONTH1 = grp.Count(g => g["MONTH"].ToString() == "1"), 
     IP1 = grp.Count(g => g["COVCODE"].ToString() == "INPATIENT"), 
     OP1 = grp.Count(g => g["COVCODE"].ToString() != "INPATIENT"), 
     MONTH2 = grp.Count(g => g["MONTH"].ToString() == "2"), 
     IP2 = grp.Count(g => g["COVCODE"].ToString() == "INPATIENT"), 
     OP2 = grp.Count(g => g["COVCODE"].ToString() != "INPATIENT"), 
     MONTH3 = grp.Count(g => g["MONTH"].ToString() == "3") 
     IP3 = grp.Count(g => g["COVCODE"].ToString() == "INPATIENT"), 
     OP3 = grp.Count(g => g["COVCODE"].ToString() != "INPATIENT"), 
}; 

Answer 1

嘗試這樣的：

var hospital = 
    from hosp in tblClaimsMain.AsEnumerable()   
    group hosp by new{CODE=hosp["CODE"],NAME=hosp["NAME"],REGION=hosp["REGION"]} into grp 
    select new 
    { 
      ProviderCode = grp.Key.CODE, 
      ProviderName = grp.Key.NAME, 
      Region = grp.Key.REGION, 
      MONTH1 = grp.Count(g => g["MONTH"].ToString() == "1"), 
      IP1 = grp.Count(g =>g["MONTH"].ToString() == "1" && g["COVCODE"].ToString() == "IP"), 
      OP1 = grp.Count(g =>g["MONTH"].ToString() == "1"&& g["COVCODE"].ToString() == "OP"), 
      MONTH2 = grp.Count(g => g["MONTH"].ToString() == "2"), 
      IP2 = grp.Count(g =>g["MONTH"].ToString() == "2" && g["COVCODE"].ToString() == "IP"), 
      OP2 = grp.Count(g =>g["MONTH"].ToString() == "2"&& g["COVCODE"].ToString() == "OP"), 
      MONTH3 = grp.Count(g => g["MONTH"].ToString() == "3"), 
      IP3 = grp.Count(g =>g["MONTH"].ToString() == "3" && g["COVCODE"].ToString() == "IP"), 
      OP3 = grp.Count(g =>g["MONTH"].ToString() == "3" && g["COVCODE"].ToString() == "OP") 
    }; 

Answer 2

Спасибо！ Работает！

 var queryZakaz = (
       from table in dtZakaz.AsEnumerable() 
       group table by table.Field<decimal>("DOCID") into g //группировка по DOCID 
       select new 
       { 
        DOCID=g.Key, 
        SUPPLIER_ID = g.Select(table => table["SUPPLIER_ID"].ToString()).FirstOrDefault(), 
        totalCountZakazBEZ_NDS=Convert.ToDecimal(g.Where(table => table.Field<decimal>("TAXID") == 1).Count()), 
        totalCountZakazNDS = Convert.ToDecimal(g.Where(table => table.Field<decimal>("TAXID") == 2).Count()), 
        totalSumZakazBEZ_NDS=g.Where(table => table.Field<decimal>("TAXID") == 1).Sum(table => table.Field<decimal>("PRICE1")), 
        totalSumZakazNDS = g.Where(table => table.Field<decimal>("TAXID") == 2).Sum(table => table.Field<decimal>("PRICE1")) 
       });