小编Vin*_*nde的帖子

我有这个LINQ查询

dbContext.Customers.Where(c => c.AssetTag == assetTag).Count();

要么

(from c in dbContext.Customers
 where c.AssetTag == assetTag
 select c).Count();

生成的SQL是

SELECT 
[GroupBy1].[A1] AS [C1]
FROM ( SELECT 
    COUNT(1) AS [A1]
    FROM [dbo].[Customer] AS [Extent1]
    WHERE (([Extent1].[AssetTag] = @p__linq__0) AND ( NOT ([Extent1].[AssetTag] IS NULL    OR @p__linq__0 IS NULL))) OR (([Extent1].[AssetTag] IS NULL) AND (@p__linq__0 IS NULL))
)  AS [GroupBy1]

那么为什么LINQ会为一个简单的where语句生成如此复杂的SQL呢？