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在打开工作簿之前，改日期格式？

但是，试过插在哪一行都不对？？？

以下是问题代码：

Dim ckl As WinForm.CheckedListBox = e.Form.Controls("CheckedListBox1")
Dim nms As New List(of String)
For i As Integer = 0 To ckl.Items.count - 1 '获取已经勾选的列
    If ckl.GetItemChecked(i) Then
        nms.Add(ckl.Items(i))
    End If
Next
If nms.Count = 0 Then
    MessageBox.Show("至少要选择一列","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Return
End If

'生成Excel表
Dim dt As Table = Tables("意和表窗口_意和表")
Dim Book As New XLS.Book
Dim Sheet As XLS.Sheet = Book.Sheets(0)

For i As Integer = 0 To nms.count -1
    Sheet(0, i).Value = nms(i)
Next
For r As Integer = 0 To dt.Rows.Count - 1 '填入数据
    For i As Integer = 0 To nms.count -1
        Sheet(r + 1, i).Value = dt.rows(r)(nms(i))
    Next
Next

'保存并打开excel文件
Book.Save("D:\项目\cs005\test.xls")

Dim St2 As XLS.Style = Book.NewStyle
St2.Format = "yyyy-MM-dd"
Sheet.Cols(dt.Cols("出库日期").Index).Style = st2

Dim Proc As New Process
Proc.File = "D:\项目\cs005\test.xls"
Proc.Start()

主题：在打开工作簿之前，改日期格式？