c# – 奇怪的选择/删除Linq2SQL中的查询生成

由于某些或其他原因,Linq2SQL在我的一个表上生成以下内容以进行删除：

DELETE FROM [dbo].[Tag] WHERE ([TagId] = @p0) AND ([Type] = @p1)
-- @p0: Input UniqueIdentifier (Size = 0; Prec = 0; Scale = 0) 
                               [fb538481-562d-45f2-bb33-3296cd7d0b28]
-- @p1: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [1]
-- @p2: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [0]
-- @p3: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [7]
-- @p4: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [5]
-- @p5: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [8]
-- @p6: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [4]
-- @p7: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [3]
-- @p8: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [9]
-- @p9: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [6]
-- @p10: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [1]
-- @p11: Input TinyInt (Size = 1; Prec = 0; Scale = 0) [2]
-- Context: SqlProvider(Sql2008) Model: AttributedMetaModel 
      Build: 3.5.30729.1

可以看出,前两个参数(@ p0和@ p1)是正确的,但随后它生成一个从0到9的唯一编号的随机集合.

现在这不会以任何方式影响查询/行为,我只对这里发生的事情感兴趣.

更新：

Tag是Linq2SQL继承的基类.额外的参数似乎是所有继承类型的鉴别器(Type)的整数值.如果我删除继承的类型,额外的参数会下降.

更新2：

我注意到SELECT也会发生这种情况.

SELECT 
    (CASE 
        WHEN EXISTS(
            SELECT NULL AS [EMPTY]
            FROM [Tag] AS [t0]
            WHERE ([t0].[TagId] = @p0) AND ([t0].[TagType] = @p1)
            ) THEN 1
        ELSE 0
     END) AS [value]
-- @p0: Input Guid (Size = 0; Prec = 0; Scale = 0) 
                   [60000000-0000-0000-0000-fe0000000025]
-- @p1: Input Byte (Size = 0; Prec = 0; Scale = 0) [25]
-- @p2: Input Byte (Size = 0; Prec = 0; Scale = 0) [0]
-- @p3: Input Byte (Size = 0; Prec = 0; Scale = 0) [10]
-- @p4: Input Byte (Size = 0; Prec = 0; Scale = 0) [28]
-- @p5: Input Byte (Size = 0; Prec = 0; Scale = 0) [13]
-- @p6: Input Byte (Size = 0; Prec = 0; Scale = 0) [27]
-- @p7: Input Byte (Size = 0; Prec = 0; Scale = 0) [1]
-- @p8: Input Byte (Size = 0; Prec = 0; Scale = 0) [2]
-- @p9: Input Byte (Size = 0; Prec = 0; Scale = 0) [3]
-- @p10: Input Byte (Size = 0; Prec = 0; Scale = 0) [4]
-- @p11: Input Byte (Size = 0; Prec = 0; Scale = 0) [5]
-- @p12: Input Byte (Size = 0; Prec = 0; Scale = 0) [6]
-- @p13: Input Byte (Size = 0; Prec = 0; Scale = 0) [7]
-- @p14: Input Byte (Size = 0; Prec = 0; Scale = 0) [8]
-- @p15: Input Byte (Size = 0; Prec = 0; Scale = 0) [9]
-- @p16: Input Byte (Size = 0; Prec = 0; Scale = 0) [11]
-- @p17: Input Byte (Size = 0; Prec = 0; Scale = 0) [12]
-- @p18: Input Byte (Size = 0; Prec = 0; Scale = 0) [14]
-- @p19: Input Byte (Size = 0; Prec = 0; Scale = 0) [15]
-- @p20: Input Byte (Size = 0; Prec = 0; Scale = 0) [16]
-- @p21: Input Byte (Size = 0; Prec = 0; Scale = 0) [17]
-- @p22: Input Byte (Size = 0; Prec = 0; Scale = 0) [18]
-- @p23: Input Byte (Size = 0; Prec = 0; Scale = 0) [19]
-- @p24: Input Byte (Size = 0; Prec = 0; Scale = 0) [20]
-- @p25: Input Byte (Size = 0; Prec = 0; Scale = 0) [21]
-- @p26: Input Byte (Size = 0; Prec = 0; Scale = 0) [22]
-- @p27: Input Byte (Size = 0; Prec = 0; Scale = 0) [23]
-- @p28: Input Byte (Size = 0; Prec = 0; Scale = 0) [24]
-- @p29: Input Byte (Size = 0; Prec = 0; Scale = 0) [26]
-- Context: SqlProvider(SqlCE) Model: AttributedMetaModel 
      Build: 3.5.30729.1

请注意.根据MS示例,我使用enum作为鉴别器.

更新3

现在我正在运行一个SQL分析器,我看到以下内容,而且非常令人担忧:(

exec sp_executesql N'SELECT 
    (CASE 
        WHEN EXISTS(
            SELECT NULL AS [EMPTY]
            FROM [Tag] AS [t0]
            WHERE ([t0].[TagId] = @p0) AND ([t0].[TagType] = @p1)
            ) THEN 1
        ELSE 0
     END) AS [value]',N'@p0 uniqueidentifier,@p1 tinyint,@p2 tinyint,@p3 tinyint,@p4 tinyint,@p5 tinyint,@p6 tinyint,@p7 tinyint,@p8 tinyint,@p9 tinyint,@p10 tinyint,@p11 tinyint,@p12 tinyint,@p13 tinyint,@p14 tinyint,@p15 tinyint,@p16 tinyint,@p17 tinyint,@p18 tinyint,@p19 tinyint,@p20 tinyint,@p21 tinyint,@p22 tinyint,@p23 tinyint,@p24 tinyint,@p25 tinyint,@p26 tinyint,@p27 tinyint,@p28 tinyint,@p29 tinyint,@p30 tinyint,@p31 tinyint,@p32 tinyint',@p0='60000000-0000-0000-0000-FE0000000025',@p1=25,@p2=0,@p3=23,@p4=29,@p5=31,@p6=16,@p7=14,@p8=1,@p9=2,@p10=3,@p11=4,@p12=5,@p13=6,@p14=7,@p15=8,@p16=9,@p17=10,@p18=11,@p19=12,@p20=13,@p21=22,@p22=15,@p23=17,@p24=18,@p25=19,@p26=20,@p27=21,@p28=27,@p29=24,@p30=26,@p31=30,@p32=28

谢谢

leppie

解决方法

这听起来像Linq2Sql中的某个bug.我认为不应该生成额外的参数.

我想你应该在Microsoft Connect上提交一个bug.