主题：合并EXCEL问题

下面代码是我从论坛搜素,通用判断不重复导入,注意: 准备导入表的字段应该包含在接收表中

Dim dlg As New OpenFileDialog '定义一个新的OpenFileDialog
dlg.Filter= "Excel文件|*.xls|CSV文件|*.csv" '设置筛选器
If dlg.ShowDialog = DialogResult.Ok Then '如果用户单击了确定按钮
    Dim Book As New XLS.Book(dlg.FileName)
    Dim Sheet As XLS.Sheet = Book.Sheets(0)
    For i As Integer = 0 To Sheet.Cols.Count -1
        If CurrentTable.Cols.Contains( Sheet(0,i).Value) = False Then
            MessageBox.Show("目标文件不含【" & Sheet(0,i).Value & "】列,请修改与目标文件一致!", "导入错误提示")
            Return
        End If
    Next
    Dim Filter1 As String
    For r As Integer = 1 To Sheet.Rows.Count - 1
        Filter1 = ""
        For c As Integer = 0 To Sheet.Cols.Count - 1
            If c > 0 Then
                Filter1 = Filter1 & " And "
            End If
            'If  CurrentTable.DataTable.DataCols(sheet(0,c).Value).Isnumeric Then
                'If sheet(r,c).Value = "" Then
                   ' Filter1 = Filter1 & sheet(0,c).Value & " is null"
                'Else
                    'Filter1 = Filter1 & sheet(0,c).Value & " = " & sheet(r,c).Value
                'End If
            'Else
                If sheet(r,c).Value.Trim = "" Then
                    Filter1 = Filter1 & sheet(0,c).Value & " is null "
                Else
                    Filter1 = Filter1 & sheet(0,c).Value & " = '" & sheet(r,c).Value.Trim() & "'"
                End If
           ' End If
        Next
        If CurrentTable.DataTable.Find(Filter1) Is Nothing Then
            Dim dr As Row = CurrentTable.AddNew()
            For c As Integer = 0 To Sheet.Cols.Count - 1
                dr(Sheet(0,c).Value) = Sheet(r,c).Value.Trim
            Next
        End If
    Next
End If