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--  专家坐堂  (http://www.foxtable.com/bbs/list.asp?boardid=2)
----  为什么改动一下就不行了？  (http://www.foxtable.com/bbs/dispbbs.asp?boardid=2&id=151044)

--  作者：采菊东篱下
--  发布时间：2020/6/13 16:08:00
--  为什么改动一下就不行了？

原来的代码没问题的：
Dim qsmc As WinForm.ComboBox = e.Form.Controls("棋赛名称")
Dim di1 As String = qsmc.Value
Dim m As WinForm.TextBox = e.Form.Controls("第几轮")
Dim di2 As String = m.Value
Dim bsrq As WinForm.DateTimePicker = e.Form.Controls("rq")
Dim di3 As Date = bsrq.Value
Dim dr As DataRow = DataTables("比赛积分").SQLfind("[棋赛名称] = \'" & di1 & "\'")
Dim a As String = Cstr(Val(di2)-1)
If DataTables("比赛积分").DataRows.count = 0 OrElse dr Is Nothing Then
Dim dts As List(of DataRow) = DataTables("基本信息").SQLSelect("[棋赛名称] = \'" & di1 & "\'And [身份] = \'参赛人\'")
Dim i2 As Integer = 1
Do While dts.Count > 0
Dim idx As Integer = rand.Next(0,dts.Count-1)
dr = DataTables("比赛积分").AddNew()
dr("桌号") = math.Ceiling((i2+1) \\ 2)
dr("日期") = di3
dr("棋赛名称") = di1
dr("第几轮比赛") = di2
dr("编号") = dts(idx)("编号")
dr("姓名") = dts(idx)("姓名")
dts.RemoveAt(idx)
i2 += 1
Loop
DataTables("比赛积分").Save()
DataTables("对阵表").DataRows.Clear
Dim drs1 As List(of DataRow) = DataTables("比赛积分").SQLSelect("[棋赛名称] = \'" & di1 & "\'And [第几轮比赛] = \'" & di2 & "\'","","第几轮比赛,桌号")
For i As Integer = 0 To drs1.Count - 1 Step 2
If i+1 <= drs1.Count - 1
Dim nr As DataRow = DataTables("对阵表").AddNew()
nr("桌号") = drs1(i)("桌号")
nr("红方_编号") = drs1(i)("编号")
nr("红方_姓名") = drs1(i)("姓名")
nr("黑方_编号") = drs1(i+1)("编号")
nr("黑方_姓名") = drs1(i+1)("姓名")
End If
Next
因为还要利用dr继续写代码，就改为：
Dim qsmc As WinForm.ComboBox = e.Form.Controls("棋赛名称")
Dim di1 As String = qsmc.Value
Dim m As WinForm.TextBox = e.Form.Controls("第几轮")
Dim di2 As String = m.Value
Dim bsrq As WinForm.DateTimePicker = e.Form.Controls("rq")
Dim di3 As Date = bsrq.Value
Dim drs As List(of DataRow) = DataTables("比赛积分").SQLSelect("[棋赛名称] = \'" & di1 & "\'And [第几轮比赛] = \'" & di2 & "\'")
For Each dr As DataRow In drs
Dim a As String = Cstr(Val(di2)-1)
Dim i2 As Integer = 1
Dim dts As List(of DataRow) = DataTables("基本信息").SQLSelect("[棋赛名称] = \'" & di1 & "\'And [身份] = \'参赛人\'")
  DataTables("比赛积分").DeleteFor("棋赛名称 is null and 第几轮比赛 is null")
  If di2 =1 And (DataTables("比赛积分").DataRows.count = 0 OrElse drs.count <= dts.Count) Then　
Do While dts.Count > 0
Dim idx As Integer = rand.Next(0,dts.Count-1)
dr = DataTables("比赛积分").AddNew
dr("桌号") = math.Ceiling((i2+1) \\ 2)
dr("日期") = di3
dr("棋赛名称") = di1
dr("第几轮比赛") = di2
dr("编号") = dts(idx)("编号")
dr("姓名") = dts(idx)("姓名")
dts.RemoveAt(idx)
i2 += 1
Loop
DataTables("比赛积分").Save()
DataTables("对阵表").DataRows.Clear
Dim drs1 As List(of DataRow) = DataTables("比赛积分").SQLSelect("[棋赛名称] = \'" & di1 & "\'And [第几轮比赛] = \'" & di2 & "\'","","桌号")
For i As Integer = 0 To drs1.Count - 1 Step 2
If i+1 <= drs1.Count - 1
Dim nr As DataRow = DataTables("对阵表").AddNew
nr("桌号") = drs1(i)("桌号")
nr("红方_编号") = drs1(i)("编号")
nr("红方_姓名") = drs1(i)("姓名")
nr("黑方_编号") = drs1(i+1)("编号")
nr("黑方_姓名") = drs1(i+1)("姓名")
End If
Next
　End If
Next
红色部分是我改动过的，删除添加的空行，不允按了多次按钮生成了多次数据。

--  作者：有点蓝
--  发布时间：2020/6/13 16:32:00
--
不行了指什么？什么地方不行了？
第一段红色代码，sqlselect如果有结果，能够进入for each循环，说明"比赛积分"表肯定是有数据的，第二段红色代码的判断【DataTables("比赛积分").DataRows.count = 0】完全就是多余的，因为count肯定不等于0。
至于【drs.count <= dts.Count】条件是否成立，自己调试一下
msgbox(drs.count)
msgbox(dts.count)

--  作者：采菊东篱下
--  发布时间：2020/6/13 17:17:00
--
一开始是空表，或不存在棋赛名称和第几轮比赛，不要DataTables("比赛积分").DataRows.count = 0我也试过，都不能生成数据。代码在对阵表中的综合排座上。
下载信息  [文件大小：   下载次数： ]
点击浏览该文件:象棋排赛.foxdb
密码：888888

--  作者：有点蓝
--  发布时间：2020/6/13 17:31:00
--
看不懂您的代码。请使用文字说明一下具体的实现逻辑，比如第一轮想做什么功能？把哪个表的数据按照什么规则填充到哪个表？最后生成的结果应该是怎么样的？最好是画个流程图，把您的思路表现出来

--  作者：采菊东篱下
--  发布时间：2020/6/13 17:46:00
--
加上messagebox.show(drs.count)，完全没反应，因为比赛积分表中一开始完全没有记录，但必须加这判断，否则表上已生成数据，因为多次按按钮，再度生成。

--  作者：采菊东篱下
--  发布时间：2020/6/13 19:25:00
--

改为这样解决了:
Dim qsmc As WinForm.ComboBox = e.Form.Controls("棋赛名称")
Dim di1 As String = qsmc.Value
Dim m As WinForm.TextBox = e.Form.Controls("第几轮")
Dim di2 As String = m.Value
Dim bsrq As WinForm.DateTimePicker = e.Form.Controls("rq")
Dim di3 As Date = bsrq.Value
Dim dr As DataRow = DataTables("比赛积分").SQLfind("[棋赛名称] = \'" & di1 & "\'And [第几轮比赛] = \'" & di2 & "\'")
Dim a As String = Cstr(Val(di2)-1)
Dim i2 As Integer = 1
Dim dts As List(of DataRow) = DataTables("基本信息").SQLSelect("[棋赛名称] = \'" & di1 & "\'And [身份] = \'参赛人\'")
DataTables("比赛积分").DeleteFor("棋赛名称 is null and 第几轮比赛 is null")
Dim cnt As Integer
cnt = DataTables("比赛积分").Compute("Count([姓名])", "[棋赛名称] = \'" & di1 & "\'And [第几轮比赛] = \'" & di2 & "\'")
If di2 =1 And cnt = 0 Then
Do While dts.Count > 0
Dim idx As Integer = rand.Next(0,dts.Count-1)
dr = DataTables("比赛积分").AddNew
dr("桌号") = math.Ceiling((i2+1) \\ 2)
dr("日期") = di3
dr("棋赛名称") = di1
dr("第几轮比赛") = di2
dr("编号") = dts(idx)("编号")
dr("姓名") = dts(idx)("姓名")
dts.RemoveAt(idx)
i2 += 1
Loop
DataTables("比赛积分").Save()
DataTables("对阵表").DataRows.Clear
Dim drs1 As List(of DataRow) = DataTables("比赛积分").SQLSelect("[棋赛名称] = \'" & di1 & "\'And [第几轮比赛] = \'" & di2 & "\'","","桌号 Desc")
For i As Integer = 0 To drs1.Count - 1 Step 2
If i+1 <= drs1.Count - 1
Dim nr As DataRow = DataTables("对阵表").AddNew
nr("桌号") = drs1(i)("桌号")
nr("红方_编号") = drs1(i)("编号")
nr("红方_姓名") = drs1(i)("姓名")
nr("黑方_编号") = drs1(i+1)("编号")
nr("黑方_姓名") = drs1(i+1)("姓名")
End If
Next
End If

[此贴子已经被作者于2020/6/13 20:33:06编辑过]