LINQ案例查询时 [英] LINQ Case When Query

问题描述

我在Oracle SQL语法中有一个如下所示的SQL查询，并且我希望它在LINQ中相等.

I have an SQL query like below in Oracle SQL syntax and I want it in LINQ equal.

Select Case When tbl.Id=1 then 1 else NULL End as col1,
Case When tbl.Id=2 then 2 else NULL End as col2,
Case When tbl.Id=3 then 3 else NULL End as col3
From Table1 tbl

推荐答案

您将使用

You would use the conditional operator in the Select:

var result = 
    table1.Select(x => new
                       {
                           col1 = x.Id == 1 ? (int?)1 : null,
                           col3 = x.Id == 2 ? (int?)2 : null,
                           col3 = x.Id == 3 ? (int?)3 : null
                       });

这篇关于LINQ案例查询时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！