實體框架6 context.Database.SqlQuery <bool>

Question

可能是一個很好的解決辦法。

我需要做一個原始的SQL數據庫查詢：

var blnOrders = (bool)db.Database.SqlQuery<bool>(@"SELECT 
    CASE WHEN (EXISTS (SELECT 
     1 AS [C1] 
     FROM [dbo].[Orders] AS [Extent1] WITH (TABLOCKX, HOLDLOCK) 
     WHERE [Extent1].[OrderNumber] IS NOT NULL 
    )) THEN cast(1 as bit) WHEN (NOT EXISTS (SELECT 
     1 AS [C1] 
     FROM [dbo].[Orders] AS [Extent2] WITH (TABLOCKX, HOLDLOCK) 
     WHERE [Extent2].[OrderNumber] IS NOT NULL 
    )) THEN cast(0 as bit) END AS [C1] 
    FROM (SELECT 1 AS X) AS [SingleRowTable1]") 

一個DbRawSqlQuery<bool>從此返回。試圖將其轉換爲bool，然後使用變量使我有以下錯誤：

Cannot implicitly convert type 'System.Data.Entity.Infrastructure.DbRawSqlQuery<bool>' to 'bool' 

我不知道我做錯了什麼？我以爲你可以把它投到bool？

檢查了文檔here，但僅有一個使用SqlQuery<string>的示例。

Answer 1

拆下（布爾）作爲伊赫桑告訴你，然後

var res = await blnOrders.SingleAsync();