一、如下图所示，当我用 .WhereIF(input.Plancontroltype > 0, u => u.Plancontroltype== (DnjqPlancontroltype)input.Plancontroltype)    这里面用等于的时候，返回结果一条数据都没有。

上图中生成的SQL如下：

 SELECT `id` AS `Id` ,`code` AS `Code` ,`name` AS `Name` ,`namenum` AS `Namenum` ,`realnamenum` AS `Realnamenum` ,`batchsn` AS `Batchsn` ,`plateweight` AS `Plateweight` ,`totalweight` AS `Totalweight` ,`plancontroltype` AS `Plancontroltype` ,`outside` AS `Outside` ,`productbz` AS `Productbz` ,`userdef1` AS `Userdef1` ,`userdef2` AS `Userdef2` ,`create_user_id` AS `CreateUserId` ,`create_user` AS `CreateUser` ,`update_user_id` AS `UpdateUserId` ,`update_user` AS `UpdateUser` ,`create_time` AS `CreateTime` ,`update_time` AS `UpdateTime` ,`is_delete` AS `IsDelete` FROM `hk_dnjq_productplan`   WHERE ( `plancontroltype` = 2 )  AND ( `is_delete` = 0 )  ORDER BY `create_time` DESC LIMIT 0,100

二、然后我把  .WhereIF(input.Plancontroltype > 0, u => u.Plancontroltype>= (DnjqPlancontroltype)input.Plancontroltype) 改成 >=   。  他就能查出来3条数据了。

如下图所示：

上图产生的sql如下：

 SELECT `id` AS `Id` ,`code` AS `Code` ,`name` AS `Name` ,`namenum` AS `Namenum` ,`realnamenum` AS `Realnamenum` ,`batchsn` AS `Batchsn` ,`plateweight` AS `Plateweight` ,`totalweight` AS `Totalweight` ,`plancontroltype` AS `Plancontroltype` ,`outside` AS `Outside` ,`productbz` AS `Productbz` ,`userdef1` AS `Userdef1` ,`userdef2` AS `Userdef2` ,`create_user_id` AS `CreateUserId` ,`create_user` AS `CreateUser` ,`update_user_id` AS `UpdateUserId` ,`update_user` AS `UpdateUser` ,`create_time` AS `CreateTime` ,`update_time` AS `UpdateTime` ,`is_delete` AS `IsDelete` FROM `hk_dnjq_productplan`   WHERE ( `plancontroltype` >= 2 )  AND ( `is_delete` = 0 )  ORDER BY `create_time` DESC LIMIT 0,100

三、而实际上我的数据表中plancontroltype字段是有2行等于2 的数据的， 按理说用==条件应该是可以查出来数据的。 如下图分别展示了 sql语句的>= 和=条件查出来的结果。

我还试过 代码里用<= 的判断，也查不出来结果，但是用sql语句是可以查出来结果的。