代码改成
Dim Book As New XLS.Book(ProjectPath & "Attachments\采购订单合同.xlsx")
Dim fl As String = ProjectPath & "Reports\采购订单合同.xlsx"
Dim str As String = "-1,"
Dim t As Table = e.Form.controls("table1").Table
For Each r As Row In t.GetCheckedRows
str &= r("_Identify") & ","
Next
book.sheets(0)(10,11).value = "<[_Identify] in (" & str.trim(",") & ")>"
Book.Build() '生成细节区
Book.Save(fl) '保存工作簿
Dim Proc As New Process '打开工作簿
Proc.File = fl
'Proc.Verb = "Print" '指定动作
Proc.Start()