主题：赋值的时候如何能遍历所有列

For Each dc As DataCol In DataTables("表B").DataCols
         dr(dc.Name) = e.DataRow(dc.Name)
Next

如果列名不同，或者只需复制部分列，可以参考下面的代码：

    Dim nma() As String = {"A1","A2","A3","A4"} 'A表数据来源列
    Dim nmb() As String = {"B1","B2","B3","B4"} 'B表数据接收列
    Dim dr As DataRow = DataTables("表B").AddNew
    For i As Integer = 0 To nma.Length - 1
        dr(nmb(i)) = e.DataRow(nma(i))
    Next