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打印按钮报错：

String was not recognized as a valid DateTime.

打印按钮代码如下：

'页面设置

Dim doc As New PrintDoc '定义一个报表

Doc.PageSetting.LeftMargin = 15

Doc.PageSetting.BottomMargin = 15

Doc.PageSetting.TopMargin = 15

Doc.PageSetting.rightMargin = 15

Dim rm As prt.RenderEmpty '定一个空对象

doc.Pagesetting.LandScape = True

'设置页脚

Dim yj As New prt.RenderText '定义一个文本对象

yj = New prt.RenderText '设置文本对象的内容

yj.Text = "第[PageNo]页共[PageCount]页" '设置文本内容

yj.Style.TextAlignHorz = prt.AlignHorzEnum.center '页脚中间对齐

yj.Style.FontSize = 9 '字体大小为10磅

yj.Style.Padding.Bottom = -10 '底端内容缩进10毫米

Doc.PageFooter = yj '作为页脚使用

Dim tbl8 As Table = Tables("隐患排查治理台账")

'排查表

Dim rt8 As Prt.RenderTable

Dim rx8 As prt.RenderText

Dim Rows8 As List(Of DataRow)

'设置二级标题

rx8 = New prt.RenderText

rx8.Style.FontSize = 16

rx8.Style.Spacing.Bottom = 5

Dim dr As String = Forms("mainform").controls("安全检查台账企业名称").value

rx8.text = dr & vbcrlf & "隐患排查台账" '表标题显示企业名称

rx8.Style.TextAlignHorz = prt.AlignHorzEnum.Center '标题水平居中

doc.Body.Children.Add(rx8)

'设置表格样式

rt8 = New prt.RenderTable

rt8.Style.TextAlignVert = prt.AlignVertEnum.Center

rt8.Style.GridLines.All = New prt.LineDef(0.3,Color.blue)

rt8.Style.Spacing.Bottom = 5

rt8.CellStyle.Spacing.All = 1

rt8.Style.Font = tbl8.Font

'设置表格细节

Rows8 = tbl8.DataTable.Select("企业名称 Like '*" & Forms("mainform").controls("安全检查台账企业名称").value & "*' and 年度 Like '*" & Forms("mainform").controls("安全检查台账年度").value & "*' and 检查时间 >= #" & Forms("mainform").controls("DateTimePicker8").Value & "# and 检查时间 <= #" & Forms("mainform").controls("DateTimePicker9").Value & "#","检查时间") '指定符合条件的行和排序方式

Dim nms8() As String = {"年度","检查类型","检查时间","所在部门","隐患内容","整改措施","隐患照片","责任人","完成时间","备注"}

Dim caps() As String = {"序号","检查类型","检查时间","所在部门","隐患内容","整改措施","隐患照片","责任人","完成时间","备注"} '自定义列名

For c As Integer = 0 To nms8.length - 1

Dim ary() As String = caps(c).split("|")

For i As Integer = 0 To ary.length-1

rt8.cells(i, c).text = ary(i)

Next '打印的列标题自定义

rt8.Cells(0,c).Style.TextAlignHorz = prt.AlignHorzEnum.Center '标题内容水平居中

rt8.Cols(0).Width = 15 '设置各列宽度

rt8.Cols(1).Width = 30

rt8.Cols(2).Width = 30

rt8.Cols(3).Width = 35

rt8.Cols(4).Width = 60

rt8.Cols(5).Width = 50

rt8.Cols(6).Width = 50

rt8.Cols(7).Width = 25

rt8.Cols(8).Width = 30

rt8.Cols(9).Width = 25

For r As Integer = 0 To Rows8.Count -1

If c=0 Then

rt8.Cells(r + 1, c).Text = r+1 '增加了序号列,并自动填充

Else

rt8.Cells(r + 1, c).Text = rows8(r)(tbl8.Cols(nms8(c)).Name)

End If

rt8.RowGroups(0,1).Header = prt.TableHeaderEnum.All

doc.Body.Children.Add(rt8)

Doc.Preview() '预览报表

请老师看一下哪错了，怎么改？谢谢

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