主题：[求助] 用这个代码导入excel会打开两次，怎么修改呢

Dim dlg As New OpenFileDialog '定义一个新的OpenFileDialog
dlg.Filter = "Excel文件|*.xls;*.xlsx"
If dlg.ShowDialog = DialogResult.Ok Then '如果用户单击了确定按钮
    Dim mg As New Merger
    mg.SourcePath = dlg.FileName
    mg.Format = "excel" '指定格式
    mg.SourceTableName = "sheet0$"
    mg.DataTableName = "订单临时表"
    mg.FieldMaps.Add("收件人电话/手机","收件人电话")
    mg.FieldMaps.Add("收件人姓名*","收件人姓名")
    mg.Merge()
    DataTables("订单临时表").DataCols("系统单号").RaiseDataColChanged()
    Dim dt As DataTable = DataTables("订单临时表汇总")
    Dim Book As New XLS.Book(dlg.FileName)
    Dim Sheet As XLS.Sheet = Book.Sheets("sheet0")
    dt.ResumeRedraw()
    dt.StopRedraw()
    'systemready = False
    Dim nms As New Dictionary(Of String, Integer)
    Dim dic As new Dictionary(Of DataRow, Integer)
    Dim ls As new List(Of Integer)
    For c As Integer = 0 To sheet.Cols.Count - 1
        If  dt.DataCols.Contains(sheet(0,c).Text.replace(" ", "")) Then
            nms.Add(sheet(0,c).Text.replace(" ", ""), c)
        End If
    Next
    Dim ls_sfzhm As new List(Of String)
    For n As Integer = 1 To Sheet.Rows.Count -1
        Dim sfzhm As String = sheet(n,nms("系统单号")).Text
        If sfzhm = "" Then Continue For
        Dim dr As DataRow = dt.Find("系统单号 = '" & sfzhm & "'")
        If dr Is Nothing Then
            If ls_sfzhm.Contains(sfzhm) = False Then
                ls.add(n)
                ls_sfzhm.Add(sfzhm)
            End If
        Else
            dic.Add(dr, n)
        End If
    Next
    For Each key As DataRow In dic.Keys
        For Each m As String In nms.keys
            If dt.DataCols(m).IsBoolean Then
                If Sheet(dic(key),nms(m)).Text = "" OrElse Sheet(dic(key),nms(m)).Text = "False" OrElse Sheet(dic(key),nms(m)).Value = 0 Then
                    key(m) = False
                Else
                    key(m) = True
                End If
            Else If dt.DataCols(m).Expression > "" Then
                '表达式列
            Else If dt.DataCols(m).IsNumeric Then
                key(m) = val(Sheet(dic(key),nms(m)).Value)
            Else If dt.DataCols(m).IsDate Then
                Dim d As Date
                If Date.TryParse(Sheet(dic(key),nms(m)).Value, d)
                    key(m) = d
                End If
            Else
                key(m) = Sheet(dic(key),nms(m)).Value
            End If
        Next
    Next
    For Each l As Integer In ls
        Dim ndr As DataRow = dt.AddNew
        For Each m As String In nms.keys
            If dt.DataCols(m).IsBoolean Then
                If Sheet(l,nms(m)).Text = "" OrElse Sheet(l,nms(m)).Text = "False" OrElse Sheet(l,nms(m)).Value = 0 Then
                    ndr (m) = False
                Else
                    ndr (m) = True
                End If
            Else If dt.DataCols(m).Expression > "" Then
                '表达式列
            Else If dt.DataCols(m).IsNumeric Then
                ndr (m) = val(Sheet(l,nms(m)).Value)
            Else If dt.DataCols(m).IsDate Then
                Dim d As Date
                If Date.TryParse(Sheet(l,nms(m)).Value, d)
                    ndr (m) = d
                End If
            Else
                ndr (m) = Sheet(l,nms(m)).Value
            End If
        Next
    Next
    dt.ResumeRedraw()
    'systemready = True
End If

Syscmd.Project.Save()