- Foxtable(狐表) (http://foxtable.net/bbs/index.asp)
-- 专家坐堂 (http://foxtable.net/bbs/list.asp?boardid=2)
---- [求助]用动态生成的字符串代替表达式，为啥总是差点火候？ (http://foxtable.net/bbs/dispbbs.asp?boardid=2&id=110267)
-- 发布时间：2017/11/30 9:06:00
-- [求助]用动态生成的字符串代替表达式，为啥总是差点火候？
Dim jbxx As DataTable = DataTables("基本信息")
Dim wfcl As DataTable = DataTables("违法及处理情况")
Dim cfyj As DataTable = DataTables("处罚依据")
Dim fltw As DataTable = DataTables("法律条文")
Dim drs As List(Of DataRow)
drs = wfcl.Select("案件编号 = \'" & jbxx.DataRows(0)("案件编号") & "\'")
Dim y As String = ""
For Each dr As DataRow In drs
Dim wfs As List(of DataRow)
wfs = cfyj.Select("违法事实 = \'" & dr（"违法事实") & "\'")
For Each wf As DataRow In wfs
y &= "[法律条文编码] = """ & wf（"法律条文编码") & """ OrElse "
Next
Next
Dim fts As List(of DataRow)
fts = fltw.Select(y.TrimEnd(" ","O","r","E","l","s","e"),"序号")
此主题相关图片如下：动态表达式错误.png
-- 发布时间：2017/11/30 9:07:00
--
y &= "[法律条文编码] = """ & wf（"法律条文编码") & """ OrElse "
这条代码有什么问题吗？
-- 发布时间：2017/11/30 9:30:00
--
Dim jbxx As DataTable = DataTables("基本信息")
Dim wfcl As DataTable = DataTables("违法及处理情况")
Dim cfyj As DataTable = DataTables("处罚依据")
Dim fltw As DataTable = DataTables("法律条文")
Dim drs As List(Of DataRow)
drs = wfcl.Select("案件编号 = \'" & jbxx.DataRows(0)("案件编号") & "\'")
Dim y As String = "1=2"
For Each dr As DataRow In drs
Dim wfs As List(of DataRow)
wfs = cfyj.Select("违法事实 = \'" & dr("违法事实") & "\'")
For Each wf As DataRow In wfs
y &= " or [法律条文编码] = \'" & wf("法律条文编码") & "\'"
Next
Next
msgbox(y)
Dim fts As List(of DataRow)
fts = fltw.Select(y,"序号")
-- 发布时间：2017/11/30 13:15:00
--
Dim y As String = "1=2"
这句有什么意义？
-- 发布时间：2017/11/30 14:33:00
--
以下是引用zyl19810322在2017/11/30 13:15:00的发言：
Dim y As String = "1=2"
Dim y As String = "1=2"
这句有什么意义？
没有意义，就是为了和 or 连接，这样就不用删除最前或者最后面的 or