LINQ case语句 [英] linq case statement

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本文介绍了LINQ case语句的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我需要一些帮助与LINQ CASE语句(C#):

  osc_products.products_quantity =
      案件
         WHEN itempromoflag<> 'N'THEN 100000
         WHEN itemcat1 IN('1','2','31')与itemsalestatus =STHEN 100000
         WHEN itemsalestatus ='O',那么0
         ELSE cds_oeinvitem.itemqtyonhand - cds_oeinvitem.itemqtycommitted
      结束

我在转换为LINQ的开始,(我还在学习):


  cdsDBDataContext DB =新cdsDBDataContext();
  VAR查询从db.cdsItems项目=
              其中,items.ItemHandHeldFlag.Equals(Y)及与放大器;
              items.ItemQtyOnHand - items.ItemQtyCommitted> 0
  选择项目;


该查询从生产更新库存状态,以一个电子商务网站。

谢谢!


解决方案

如果它只是在 CASE 语句中的 LINQ 您后(读您的评论),那么的例子这是...

 的Int32 []号=新的Int32 [] {1,2,1,3,1,5,3,1};VAR numberText =

    从个数n
    其中n> 0
    新选择
    {
        数= N,
        文字=
        (
            ñ== 1? 一:
            ñ== 2? 二:
            n ==可3? 三:未知
        )
    }
);

希望帮助:)

I need some help with CASE statements in linq (c#):

osc_products.products_quantity =
      CASE 
         WHEN itempromoflag <> 'N' THEN 100000
         WHEN itemcat1 IN ('1','2','31') AND itemsalestatus = 'S' THEN 100000
         WHEN itemsalestatus = 'O' THEN 0
         ELSE cds_oeinvitem.itemqtyonhand - cds_oeinvitem.itemqtycommitted 
      END  

My start at converting to linq, (I'm still learning):

cdsDBDataContext db = new cdsDBDataContext();
  var query = from items in db.cdsItems
              where items.ItemHandHeldFlag.Equals("Y") && 
              items.ItemQtyOnHand -  items.ItemQtyCommitted > 0
  select items;

This query updates stock status from production to a commerce site.

Thanks !!!

解决方案

If its just the CASE statement in LINQ your after (read your comment) then an example of this is...

Int32[] numbers = new Int32[] { 1, 2, 1, 3, 1, 5, 3, 1 };

var numberText =
(
    from n in numbers
    where n > 0
    select new
    {
        Number = n,
        Text = 
        (
            n == 1 ? "One" :
            n == 2 ? "Two" :
            n == 3 ? "Three" : "Unknown"
        )
    }
);

Hope that helps :)

这篇关于LINQ case语句的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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