主题：[求助]

 呃……哪有你这样的引用数据？太混乱了吧？

 你是想填充数据还是想怎样，没看懂你代码想表达写什么。

不清楚你的逻辑是什么不过估计这样可以。

Dim jsmc As WinForm.ComboBox = e.Form.Controls("竞赛名称")
Dim xzb As WinForm.ComboBox = e.Form.Controls("选择表")
Dim xm As WinForm.ComboBox = e.Form.Controls("项目")
Dim dt As DataTable = DataTables(""& xzb.text & "")
Dim dt1 As DataTable = DataTables("报名表")
Dim dr,fr As DataRow
Dim Ary As String()

For Each Ary In dt1.GetUniqueValues("竞赛名称='" & jsmc.text & "' And 参赛项目  like '*" & xm.Text & "*'","编号","中小学","学校","姓名","场地","参赛项目","竞赛名称")
    Dim flt As String  = "竞赛名称 = '" & ary(0) & "'  And  编号 = '" & ary(6) & "'"
    If dt1.Find(flt) Is Nothing Then    
        dr = dt.AddNew
        dr("编号") = Ary(0)
        dr("中小学") = Ary(1)
        dr("学校") = Ary(2)
        dr("姓名") = Ary(3)
        dr("场地") = Ary(4)
        dr("参赛项目") = Ary(5)
        dr("竞赛名称") = Ary(6)
    End If
Next

DataTables(""& xzb.text & "").AllowEdit = False

 其实我觉得你应该用这种填充吧？

Dim Cols1() As String = {"来源列一","来源列二","来源列三"}
Dim Cols2() As String = {"接收列一","接收列二","接收列三"}
For Each dr1 As DataRow In DataTables("表A").Select("[金额] > 100")
    Dim dr2 As DataRow = DataTables("表B").AddNew()
    For i As Integer = 0 To Cols1.Length -1
        dr2(Cols2(i)) = dr1(Cols1(i))
    Next
Next

楼主，你要进步啊，变通一下啊。好吧？

Dim flt As String  = "竞赛名称 = '" & ary(6) & "'  And  编号 = '" & ary(0) & "'"

不空谈，项目，数据。

 代码没有错，请注意细节，你比较的表是什么，你接收的表是什么。

Dim jsmc As WinForm.ComboBox = e.Form.Controls("竞赛名称")
Dim xzb As WinForm.ComboBox = e.Form.Controls("选择表")
Dim xm As WinForm.ComboBox = e.Form.Controls("项目")
Dim dt As DataTable = DataTables(""& xzb.text & "")
Dim dt1 As DataTable = DataTables("报名表")
Dim dr,fr As DataRow
Dim Ary As String()

For Each Ary In dt1.GetUniqueValues("竞赛名称='" & jsmc.text & "' And 参赛项目  like '*" & xm.Text & "*'","编号","中小学","学校","姓名","场地","参赛项目","竞赛名称")
    Dim flt As String  = "编号 = '" & ary(0) & "'  And  竞赛名称 = '" & ary(6) & "'"

    If dt.Find(flt) Is Nothing Then   
        dr = dt.AddNew
        dr("编号") = Ary(0)
        dr("中小学") = Ary(1)
        dr("学校") = Ary(2)
        dr("姓名") = Ary(3)
        dr("场地") = Ary(4)
        dr("参赛项目") = Ary(5)
        dr("竞赛名称") = Ary(6)
    End If
Next

DataTables(""& xzb.text & "").AllowEdit = False

 代码正确，能正常导入。已测试有效。

Dim jsmc As WinForm.ComboBox = e.Form.Controls("竞赛名称")
Dim xzb As WinForm.ComboBox = e.Form.Controls("选择表")
Dim xm As WinForm.ComboBox = e.Form.Controls("项目")
Dim dt As DataTable = DataTables(""& xzb.text & "")
Dim dt1 As DataTable = DataTables("报名表")
Dim dr,fr As DataRow
Dim Ary As String()

For Each Ary In dt1.GetUniqueValues("竞赛名称='" & jsmc.text & "' And 参赛项目  like '*" & xm.Text & "*'","编号","中小学","学校","姓名","场地","参赛项目","竞赛名称")
    Dim flt As String  = "编号 = '" & ary(0) & "'  And  竞赛名称 = '" & ary(6) & "'"

    If dt.Find(flt) Is Nothing Then   
        dr = dt.AddNew
        dr("编号") = Ary(0)
        dr("中小学") = Ary(1)
        dr("学校") = Ary(2)
        dr("姓名") = Ary(3)
        dr("场地") = Ary(4)
        dr("参赛项目") = Ary(5)
        dr("竞赛名称") = Ary(6)
    End If
Next

DataTables(""& xzb.text & "").AllowEdit = False

 原本代码就是可以的，如果你注意一下dt和dt1的话。