Question

我有这张桌子：

Con   Fecha           Rid       Pdv   Pla   Descripcion       Total Quantity
----------------------------------------------------------------------------
1     2016-01-01    COMIDAS    FUEM   184   POZ ROJO           85      1
10    2016-01-01    DESAYUNOS  VTSI   184   POZ ROJO           85      4
100   2016-01-01    COMIDAS    VTSI   693   ENVASE 1 LT        10      1
101   2016-01-01    DESAYUNOS  REST   693   ENVASE 1 LT        10      2
102   2016-01-01    COMIDAS    VTSI   693   ENVASE 1 LT        10      1
103   2016-01-01    COMIDAS    REST   73    NOPAL/PIÑA VASO    34      6
104   2016-01-01    DESAYUNOS  REST   73    NOPAL/PIÑA VASO    34      1
105   2016-01-01    DESAYUNOS  REST   184   POZ ROJO           85      9
106   2016-01-01    COMIDAS    VTSI   693   ENVASE 1 LT        10      1
107   2016-01-01    CENAS      REST   184   POZ ROJO           85      2
108   2016-01-01    DESAYUNOS  REST   184   POZ ROJO           85      1

我需要的是一个Linq语句，它根据作为我主键的'Pla'数据对每个项目的所有'Quantity'进行求和，我想知道每个Distinct'Pla'有多少'Quantity'并且还将每个不同'Pla'的总和相加，得到如下输出：

Con   Fecha           Rid       Pdv   Pla   Descripcion       Total Quantity
----------------------------------------------------------------------------
1     2016-01-01    COMIDAS    FUEM   184   POZ ROJO           1445    17
100   2016-01-01    COMIDAS    VTSI   693   ENVASE 1 LT         50     5
103   2016-01-01    COMIDAS    REST   73    NOPAL/PIÑA VASO     34     6
104   2016-01-01    DESAYUNOS  REST   73    NOPAL/PIÑA VASO     34     1

如何使用Linq语句获取此输出？我所拥有的只是：

 foreach (var item in db.Pos.Select(l => l.Pla).Distinct())
 {
      //Do stuff
 }

Answer 1

您需要使用groupby

db.Pos.GroupBy(a=> a.Pla).Select(p=> new {Pla = p.Key, Quantity = p.Sum(q=>q.Quantity)});

GroupBy将键返回为不同，因此您将获得Pla的不同值以及各自数量的总和

Answer 2

您可以按GroupBy值Pla元素Sum和Total组中每个元素的Quantity和var plas = db.Pos.GroupBy(p => p.Pla).Select(g => new { Pla = g.Key, Total = g.Sum(t => t.Total), Quantity = g.Sum(t => t.Quantity) });值：

:: usage: badpings-color.bat [ip adress | hostname] 

@echo off
set /a warnlimit=79 :: greater than this value is red
                    :: between the two values is yellow
set /a goodlimit=39 :: less than or equal to this value is green

if "%1"=="" (
    set pingdest=google.com
    ) else (
    set pingdest=%1
    )

echo Pinging %pingdest%.
::echo Logging replies over %limit%ms.
echo Press Ctrl+C to end.

:Loop
for /f "usebackq tokens=1-6" %%a in (`ping -n 1 %pingdest% ^| findstr "Request Reply request"`) do (
    set var=%%a %%b %%c %%d %%e %%f
    set pingtimestr=%%e
    )

if "%pingtimestr%"=="find" (
    echo Ping request could not find host %pingdest%. Please check the name and try again.
    goto End
    ) 
if "%pingtimestr%"=="host" (
    set /a pingtime=%warnlimit%+1   
    ) 
if not defined pingtimestr (
    set /a pingtime=%warnlimit%+1
    )
if "%pingtimestr:~0,4%"=="time" (
    set /a pingtime=%pingtimestr:~5,-2% 
    )

if %pingtime% LEQ %goodlimit% (
    call :c 02 "[%time%] %var%" /n
    goto EndOfLoop
    )
if %pingtime% LEQ %warnlimit% (
    call :c 0E "[%time%] %var%" /n
    goto EndOfLoop
    )
if %pingtime% GTR %warnlimit% (
    call :c 0C "[%time%] %var%" /n
    goto EndOfLoop
    )

:EndOfLoop
timeout /t 1 /nobreak >nul
Goto Loop

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: this section is from 
:: https://stackoverflow.com/questions/4339649/how-to-have-multiple-colors-in-a-windows-batch-file/10407642#10407642

:c
setlocal enableDelayedExpansion

:colorPrint Color  Str  [/n]
setlocal
set "s=%~2"
call :colorPrintVar %1 s %3
exit /b

:colorPrintVar  Color  StrVar  [/n]
if not defined DEL call :initColorPrint
setlocal enableDelayedExpansion
pushd .
':
cd \
set "s=!%~2!"
:: The single blank line within the following IN() clause is critical - DO NOT REMOVE
for %%n in (^"^

^") do (
  set "s=!s:\=%%~n\%%~n!"
  set "s=!s:/=%%~n/%%~n!"
  set "s=!s::=%%~n:%%~n!"
)
for /f delims^=^ eol^= %%s in ("!s!") do (
  if "!" equ "" setlocal disableDelayedExpansion
  if %%s==\ (
    findstr /a:%~1 "." "\'" nul
    <nul set /p "=%DEL%%DEL%%DEL%"
  ) else if %%s==/ (
    findstr /a:%~1 "." "/.\'" nul
    <nul set /p "=%DEL%%DEL%%DEL%%DEL%%DEL%"
  ) else (
    >colorPrint.txt (echo %%s\..\')
    findstr /a:%~1 /f:colorPrint.txt "."
    <nul set /p "=%DEL%%DEL%%DEL%%DEL%%DEL%%DEL%%DEL%"
  )
)
if /i "%~3"=="/n" echo(
popd
exit /b

:initColorPrint
for /f %%A in ('"prompt $H&for %%B in (1) do rem"') do set "DEL=%%A %%A"
<nul >"%temp%\'" set /p "=."
subst ': "%temp%" >nul
exit /b

:cleanupColorPrint
2>nul del "%temp%\'"
2>nul del "%temp%\colorPrint.txt"
>nul subst ': /d
exit /b

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

:End

LinQ Sum不同值数量和总数

2 个答案: