EF对应null的处理

原来的代码是

if (string.IsNullOrWhiteSpace(seal)) seal = null;

ctx.Terminal.FirstOrDefault(ent=>ent.Seal==seal)

当seal是null时成长的sql语句如下，采用=null执行结果不是需要的

exec sp_executesql N'SELECT TOP (1)

[Extent1].[id] AS [id],

[Extent1].[Terminal] AS [Terminal],

[Extent1].[Die] AS [Die],

[Extent1].[WireGauge] AS [WireGauge],

[Extent1].[NormCCH] AS [NormCCH],

[Extent1].[ActualCCH] AS [ActualCCH],

[Extent1].[NormCCW] AS [NormCCW],

[Extent1].[ActualCCW] AS [ActualCCW],

[Extent1].[NormICH] AS [NormICH],

[Extent1].[ActualICH] AS [ActualICH],

[Extent1].[NormICW] AS [NormICW],

[Extent1].[ActualICW] AS [ActualICW],

[Extent1].[NormPullForce] AS [NormPullForce],

[Extent1].[UpPullForce] AS [UpPullForce],

[Extent1].[DownPullForce] AS [DownPullForce],

[Extent1].[ActualPullForce] AS [ActualPullForce],

[Extent1].[WireType] AS [WireType],

[Extent1].[Seal] AS [Seal],

[Extent1].[Supplier] AS [Supplier],

[Extent1].[Project] AS [Project],

[Extent1].[StripLength] AS [StripLength],

[Extent1].[coreup] AS [coreup],

[Extent1].[coredown] AS [coredown],

[Extent1].[platicup] AS [platicup],

[Extent1].[platicdown] AS [platicdown],

[Extent1].[sample] AS [sample],

[Extent1].[Tester] AS [Tester],

[Extent1].[picture] AS [picture],

[Extent1].[testdate] AS [testdate],

[Extent1].[date] AS [date],

[Extent1].[yj] AS [yj],

[Extent1].[standardY1] AS [standardY1],

[Extent1].[standardY2] AS [standardY2],

[Extent1].[standardY3] AS [standardY3],

[Extent1].[standardY4] AS [standardY4],

[Extent1].[standardY5] AS [standardY5],

[Extent1].[standardY6] AS [standardY6],

[Extent1].[standardY7] AS [standardY7],

[Extent1].[standardY8] AS [standardY8],

[Extent1].[standardY9] AS [standardY9],

[Extent1].[standardY10] AS [standardY10],

[Extent1].[standardN1] AS [standardN1],

[Extent1].[standardN2] AS [standardN2],

[Extent1].[standardN3] AS [standardN3],

[Extent1].[standardN4] AS [standardN4],

[Extent1].[standardN5] AS [standardN5],

[Extent1].[standardN6] AS [standardN6],

[Extent1].[standardN7] AS [standardN7],

[Extent1].[standardN8] AS [standardN8],

[Extent1].[standardN9] AS [standardN9],

[Extent1].[standardN10] AS [standardN10],

[Extent1].[plug] AS [plug],

[Extent1].[socket] AS [socket],

[Extent1].[remark1] AS [remark1],

[Extent1].[remark] AS [remark],

[Extent1].[CCHUp] AS [CCHUp],

[Extent1].[CCWUp] AS [CCWUp],

[Extent1].[ICHUp] AS [ICHUp],

[Extent1].[ICWUp] AS [ICWUp],

[Extent1].[CCHDown] AS [CCHDown],

[Extent1].[CCWDown] AS [CCWDown],

[Extent1].[ICHDown] AS [ICHDown],

[Extent1].[ICWDown] AS [ICWDown],

[Extent1].[CCH] AS [CCH],

[Extent1].[CCW] AS [CCW],

[Extent1].[ICH] AS [ICH],

[Extent1].[ICW] AS [ICW]

FROM (SELECT

      [Terminal].[id] AS [id],

      [Terminal].[Terminal] AS [Terminal],

      [Terminal].[Die] AS [Die],

      [Terminal].[WireGauge] AS [WireGauge],

      [Terminal].[NormCCH] AS [NormCCH],

      [Terminal].[ActualCCH] AS [ActualCCH],

      [Terminal].[NormCCW] AS [NormCCW],

      [Terminal].[ActualCCW] AS [ActualCCW],

      [Terminal].[NormICH] AS [NormICH],

      [Terminal].[ActualICH] AS [ActualICH],

      [Terminal].[NormICW] AS [NormICW],

      [Terminal].[ActualICW] AS [ActualICW],

      [Terminal].[NormPullForce] AS [NormPullForce],

      [Terminal].[UpPullForce] AS [UpPullForce],

      [Terminal].[DownPullForce] AS [DownPullForce],

      [Terminal].[ActualPullForce] AS [ActualPullForce],

      [Terminal].[WireType] AS [WireType],

      [Terminal].[Seal] AS [Seal],

      [Terminal].[Supplier] AS [Supplier],

      [Terminal].[Project] AS [Project],

      [Terminal].[StripLength] AS [StripLength],

      [Terminal].[coreup] AS [coreup],

      [Terminal].[coredown] AS [coredown],

      [Terminal].[platicup] AS [platicup],

      [Terminal].[platicdown] AS [platicdown],

      [Terminal].[sample] AS [sample],

      [Terminal].[Tester] AS [Tester],

      [Terminal].[picture] AS [picture],

      [Terminal].[testdate] AS [testdate],

      [Terminal].[date] AS [date],

      [Terminal].[yj] AS [yj],

      [Terminal].[standardY1] AS [standardY1],

      [Terminal].[standardY2] AS [standardY2],

      [Terminal].[standardY3] AS [standardY3],

      [Terminal].[standardY4] AS [standardY4],

      [Terminal].[standardY5] AS [standardY5],

      [Terminal].[standardY6] AS [standardY6],

      [Terminal].[standardY7] AS [standardY7],

      [Terminal].[standardY8] AS [standardY8],

      [Terminal].[standardY9] AS [standardY9],

      [Terminal].[standardY10] AS [standardY10],

      [Terminal].[standardN1] AS [standardN1],

      [Terminal].[standardN2] AS [standardN2],

      [Terminal].[standardN3] AS [standardN3],

      [Terminal].[standardN4] AS [standardN4],

      [Terminal].[standardN5] AS [standardN5],

      [Terminal].[standardN6] AS [standardN6],

      [Terminal].[standardN7] AS [standardN7],

      [Terminal].[standardN8] AS [standardN8],

      [Terminal].[standardN9] AS [standardN9],

      [Terminal].[standardN10] AS [standardN10],

      [Terminal].[plug] AS [plug],

      [Terminal].[socket] AS [socket],

      [Terminal].[remark1] AS [remark1],

      [Terminal].[remark] AS [remark],

      [Terminal].[CCHUp] AS [CCHUp],

      [Terminal].[CCWUp] AS [CCWUp],

      [Terminal].[ICHUp] AS [ICHUp],

      [Terminal].[ICWUp] AS [ICWUp],

      [Terminal].[CCHDown] AS [CCHDown],

      [Terminal].[CCWDown] AS [CCWDown],

      [Terminal].[ICHDown] AS [ICHDown],

      [Terminal].[ICWDown] AS [ICWDown],

      [Terminal].[CCH] AS [CCH],

      [Terminal].[CCW] AS [CCW],

      [Terminal].[ICH] AS [ICH],

      [Terminal].[ICW] AS [ICW]

      FROM [dbo].[Terminal] AS [Terminal]) AS [Extent1]

WHERE ([Extent1].[Terminal] = @p__linq__0) AND ([Extent1].[WireGauge] = @p__linq__1) AND ([Extent1].[Die] LIKE N''Q%'') AND ([Extent1].[WireType] = @p__linq__2) AND ([Extent1].[Seal] = @p__linq__3)',N'@p__linq__0 nvarchar(4000),@p__linq__1 nvarchar(4000),@p__linq__2 nvarchar(4000),@p__linq__3 nvarchar(4000)',@p__linq__0=N'968221-1',@p__linq__1=N'0.50',@p__linq__2=N'GHB2',@p__linq__3=N'NULL'

换成下面代码后生成的语句变成了Is null 正确匹配了结果

exec sp_executesql N'SELECT TOP (1)

[Extent1].[id] AS [id],

[Extent1].[Terminal] AS [Terminal],

[Extent1].[Die] AS [Die],

[Extent1].[WireGauge] AS [WireGauge],

[Extent1].[NormCCH] AS [NormCCH],

[Extent1].[ActualCCH] AS [ActualCCH],

[Extent1].[NormCCW] AS [NormCCW],

[Extent1].[ActualCCW] AS [ActualCCW],

[Extent1].[NormICH] AS [NormICH],

[Extent1].[ActualICH] AS [ActualICH],

[Extent1].[NormICW] AS [NormICW],

[Extent1].[ActualICW] AS [ActualICW],

[Extent1].[NormPullForce] AS [NormPullForce],

[Extent1].[UpPullForce] AS [UpPullForce],

[Extent1].[DownPullForce] AS [DownPullForce],

[Extent1].[ActualPullForce] AS [ActualPullForce],

[Extent1].[WireType] AS [WireType],

[Extent1].[Seal] AS [Seal],

[Extent1].[Supplier] AS [Supplier],

[Extent1].[Project] AS [Project],

[Extent1].[StripLength] AS [StripLength],

[Extent1].[coreup] AS [coreup],

[Extent1].[coredown] AS [coredown],

[Extent1].[platicup] AS [platicup],

[Extent1].[platicdown] AS [platicdown],

[Extent1].[sample] AS [sample],

[Extent1].[Tester] AS [Tester],

[Extent1].[picture] AS [picture],

[Extent1].[testdate] AS [testdate],

[Extent1].[date] AS [date],

[Extent1].[yj] AS [yj],

[Extent1].[standardY1] AS [standardY1],

[Extent1].[standardY2] AS [standardY2],

[Extent1].[standardY3] AS [standardY3],

[Extent1].[standardY4] AS [standardY4],

[Extent1].[standardY5] AS [standardY5],

[Extent1].[standardY6] AS [standardY6],

[Extent1].[standardY7] AS [standardY7],

[Extent1].[standardY8] AS [standardY8],

[Extent1].[standardY9] AS [standardY9],

[Extent1].[standardY10] AS [standardY10],

[Extent1].[standardN1] AS [standardN1],

[Extent1].[standardN2] AS [standardN2],

[Extent1].[standardN3] AS [standardN3],

[Extent1].[standardN4] AS [standardN4],

[Extent1].[standardN5] AS [standardN5],

[Extent1].[standardN6] AS [standardN6],

[Extent1].[standardN7] AS [standardN7],

[Extent1].[standardN8] AS [standardN8],

[Extent1].[standardN9] AS [standardN9],

[Extent1].[standardN10] AS [standardN10],

[Extent1].[plug] AS [plug],

[Extent1].[socket] AS [socket],

[Extent1].[remark1] AS [remark1],

[Extent1].[remark] AS [remark],

[Extent1].[CCHUp] AS [CCHUp],

[Extent1].[CCWUp] AS [CCWUp],

[Extent1].[ICHUp] AS [ICHUp],

[Extent1].[ICWUp] AS [ICWUp],

[Extent1].[CCHDown] AS [CCHDown],

[Extent1].[CCWDown] AS [CCWDown],

[Extent1].[ICHDown] AS [ICHDown],

[Extent1].[ICWDown] AS [ICWDown],

[Extent1].[CCH] AS [CCH],

[Extent1].[CCW] AS [CCW],

[Extent1].[ICH] AS [ICH],

[Extent1].[ICW] AS [ICW]

FROM (SELECT

      [Terminal].[id] AS [id],

      [Terminal].[Terminal] AS [Terminal],

      [Terminal].[Die] AS [Die],

      [Terminal].[WireGauge] AS [WireGauge],

      [Terminal].[NormCCH] AS [NormCCH],

      [Terminal].[ActualCCH] AS [ActualCCH],

      [Terminal].[NormCCW] AS [NormCCW],

      [Terminal].[ActualCCW] AS [ActualCCW],

      [Terminal].[NormICH] AS [NormICH],

      [Terminal].[ActualICH] AS [ActualICH],

      [Terminal].[NormICW] AS [NormICW],

      [Terminal].[ActualICW] AS [ActualICW],

      [Terminal].[NormPullForce] AS [NormPullForce],

      [Terminal].[UpPullForce] AS [UpPullForce],

      [Terminal].[DownPullForce] AS [DownPullForce],

      [Terminal].[ActualPullForce] AS [ActualPullForce],

      [Terminal].[WireType] AS [WireType],

      [Terminal].[Seal] AS [Seal],

      [Terminal].[Supplier] AS [Supplier],

      [Terminal].[Project] AS [Project],

      [Terminal].[StripLength] AS [StripLength],

      [Terminal].[coreup] AS [coreup],

      [Terminal].[coredown] AS [coredown],

      [Terminal].[platicup] AS [platicup],

      [Terminal].[platicdown] AS [platicdown],

      [Terminal].[sample] AS [sample],

      [Terminal].[Tester] AS [Tester],

      [Terminal].[picture] AS [picture],

      [Terminal].[testdate] AS [testdate],

      [Terminal].[date] AS [date],

      [Terminal].[yj] AS [yj],

      [Terminal].[standardY1] AS [standardY1],

      [Terminal].[standardY2] AS [standardY2],

      [Terminal].[standardY3] AS [standardY3],

      [Terminal].[standardY4] AS [standardY4],

      [Terminal].[standardY5] AS [standardY5],

      [Terminal].[standardY6] AS [standardY6],

      [Terminal].[standardY7] AS [standardY7],

      [Terminal].[standardY8] AS [standardY8],

      [Terminal].[standardY9] AS [standardY9],

      [Terminal].[standardY10] AS [standardY10],

      [Terminal].[standardN1] AS [standardN1],

      [Terminal].[standardN2] AS [standardN2],

      [Terminal].[standardN3] AS [standardN3],

      [Terminal].[standardN4] AS [standardN4],

      [Terminal].[standardN5] AS [standardN5],

      [Terminal].[standardN6] AS [standardN6],

      [Terminal].[standardN7] AS [standardN7],

      [Terminal].[standardN8] AS [standardN8],

      [Terminal].[standardN9] AS [standardN9],

      [Terminal].[standardN10] AS [standardN10],

      [Terminal].[plug] AS [plug],

      [Terminal].[socket] AS [socket],

      [Terminal].[remark1] AS [remark1],

      [Terminal].[remark] AS [remark],

      [Terminal].[CCHUp] AS [CCHUp],

      [Terminal].[CCWUp] AS [CCWUp],

      [Terminal].[ICHUp] AS [ICHUp],

      [Terminal].[ICWUp] AS [ICWUp],

      [Terminal].[CCHDown] AS [CCHDown],

      [Terminal].[CCWDown] AS [CCWDown],

      [Terminal].[ICHDown] AS [ICHDown],

      [Terminal].[ICWDown] AS [ICWDown],

      [Terminal].[CCH] AS [CCH],

      [Terminal].[CCW] AS [CCW],

      [Terminal].[ICH] AS [ICH],

      [Terminal].[ICW] AS [ICW]

      FROM [dbo].[Terminal] AS [Terminal]) AS [Extent1]

WHERE ([Extent1].[Terminal] = @p__linq__0) AND ([Extent1].[WireGauge] = @p__linq__1) AND ([Extent1].[WireType] = @p__linq__2) AND ([Extent1].[Die] LIKE N''Q%'') AND ([Extent1].[Seal] IS NULL)',N'@p__linq__0 nvarchar(4000),@p__linq__1 nvarchar(4000),@p__linq__2 nvarchar(4000)',@p__linq__0=N'968221-1',@p__linq__1=N'0.50',@p__linq__2=N'GHB2'

C#代码需要调用时显式的使用 ctx.Terminal.where(net=>ent.Seal==null) ,才能生成 is null的SQL语句

                        using (var mfgCtx = com.geelyhd.MFG.EFModel.DBCtx.GetCtx())

                        {

                            var q = mfgCtx.Terminal.Where(ent => ent.Terminal1 == ter && ent.WireGauge == card.Guage && ent.WireType == card.Wire_kinds);

                            if (terArr[i].CCHType == "30高度")

                            {

                                q =  q.Where(ent=> !ent.Die.StartsWith("Q") );

                            }

                            else //40高度带Q

                            {

                                q = q.Where(ent => ent.Die.StartsWith("Q"));

                            }

                            if (seal == null)

                            {

                                q = q.Where(ent => ent.Seal == null);

                            }

                            else

                            {

                                q = q.Where(ent => ent.Seal == seal);

                            }

                            it = q.FirstOrDefault();

                        }

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