[求助]导入EXCEL，提示从字符串“”到类型“Double”的转换无效 - 专家坐堂 - Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

老师，麻烦指导下，数量和采购价这2列在狐表里面是双精度，导入会提示错误代码从字符串“”到类型“Double”的转换无效。要如何修正了，麻烦老师指导下，谢谢

Dim dlg As New OpenFileDialog '定义一个新的OpenFileDialog

dlg.Filter= "EXCEL文件|*.xls" '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)

Tables("采购表").StopRedraw()

Dim Cols1() As String = {"编号","类别","名称","规格","单位","数量","采购价"}

Dim Cols2() As String = {"编号","类别","名称","规格","单位","数量","采购价"}

For dr1 As Integer = 1 To Sheet.Rows.Count -1

Dim dr2 As DataRow =DataTables("采购表").AddNew()

For i As Integer = 0 To Cols1.Length - 1

dr2(Cols2(i)) = sheet(dr1,i).text

Tables("采购表").ResumeRedraw()

End If

主题：[求助]导入EXCEL，提示从字符串“”到类型“Double”的转换无效