主题：新增项目表记录时，整体复制表中内容到项目表子表工料单价表中

DataRowAdded事件，写代码，查考着改。

e.DataRow.save
Dim Cols1() As String = {"工料一类","工料单位","工料单价"}
Dim Cols2() As String = {"工料一类","工料单位","工料单价"}
For Each dr1 As DataRow In DataTables("单价列表").Select("")
    Dim dr2 As DataRow = DataTables("工料单价").find("工料名称= '" & dr1("工料名称") & "' and _Identify = " & e.DataRow("_Identify"))
    If dr2 Is Nothing Then dr2 = DataTables("工料单价").AddNew()
    For i As Integer = 0 To Cols1.Length -1
        dr2(Cols2(i)) = dr1(Cols1(i))
    Next
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