大师：早上好！

为何这样就出错？显示表中不含某列

Dim cmd As New SQLCommand
Dim dt As DataTable
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"}
cmd.CommandText = "SELECT * From {表A} "
dt = cmd.ExecuteReader()
For Each dr1 As DataRow In dt.DataRows
    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

换成这样就正确

im 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").DataRows

    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

 看代码没有错。你自己执行一下 SELECT * From {表A} 的结果是什么

 http://www.foxtable.com/help/topics/1484.htm