我正在尝试根据条件对背景颜色更改 GridView 行使用脚本。它适用于所有具有值的单元格，但相同的脚本生成错误
“异常详细信息：System.FormatException：输入字符串的格式不正确”
当一个或多个单元格为空 (NULL) 时。请建议，怎么办？我正在使用以下代码：
<script runat="server">
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
int D_inshed = int.Parse(e.Row.Cells[11].Text);
foreach (TableCell cell in e.Row.Cells)
{
if (D_inshed >= 6)
{
cell.BackColor = System.Drawing.Color.Orange;
}
}
}
}
</script>
<asp:scriptmanager ID="Scriptmanager1" runat="server"></asp:scriptmanager>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
BackColor="White" BorderColor="#CC9966" BorderStyle="Solid" BorderWidth="1px"
CellPadding="4" DataKeyNames="ID"
DataSourceID="SqlDataSource1" AllowSorting="True"
OnRowDataBound="OnRowDataBound" Width="100%" >
<Columns>
<asp:TemplateField HeaderText="">
<ItemTemplate>
<%# Container.DataItemIndex + 1 %>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ID" HeaderText="ID" ReadOnly="True"
SortExpression="ID" Visible="false" ></asp:BoundField>
<asp:TemplateField HeaderText="Loco no." SortExpression="Loco_no">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Loco_no") %>' Width="80px"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Loco_no") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Type of Loco" SortExpression="Loco_type">
<EditItemTemplate>
<asp:DropDownList ID="TextBox2" runat="server" Text='<%# Bind("Loco_type") %>' Width="80px">
<asp:ListItem Text="WAP-4" Value="WAP4"></asp:ListItem>
<asp:ListItem Text="WAP-5" Value="WAP5"></asp:ListItem>
<asp:ListItem Text="WAP-7" Value="WAP7"></asp:ListItem>
<asp:ListItem Text="WAG-7" Value="WAG7"></asp:ListItem>
<asp:ListItem Text="WAG-9" Value="WAG9"></asp:ListItem>
<asp:ListItem Text="WAP-7 BHEL" Value="WAG7BHEL"></asp:ListItem>
<asp:ListItem Text="" Value=""></asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("Loco_type") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Nominated Rly/Shed" SortExpression="rly_shed">
<EditItemTemplate>
<asp:DropDownList ID="TextBox3" runat="server" Text='<%# Bind("rly_shed") %>' Width="80px">
<asp:ListItem Text="BSL" Value="BSL/CR"></asp:ListItem>
<asp:ListItem Text="AQ" Value="AQ/CR"></asp:ListItem>
<asp:ListItem Text="KYN" Value="KYN/CR"></asp:ListItem>
<asp:ListItem Text="ASN" Value="ASN/ER"></asp:ListItem>
<asp:ListItem Text="HWH" Value="HWH/ER"></asp:ListItem>
<asp:ListItem Text="MGS" Value="MGS/ECR"></asp:ListItem>
<asp:ListItem Text="GMO" Value="GMO/ECR"></asp:ListItem>
<asp:ListItem Text="WAT" Value="WAT/ECoR"></asp:ListItem>
<asp:ListItem Text="ANGL" Value="ANGL/ECoR"></asp:ListItem>
<asp:ListItem Text="GZB" Value="GZB/NR"></asp:ListItem>
<asp:ListItem Text="LDH" Value="LDH/NR"></asp:ListItem>
<asp:ListItem Text="JHS" Value="JHS/NCR"></asp:ListItem>
<asp:ListItem Text="CNB" Value="CNB/NCR"></asp:ListItem>
<asp:ListItem Text="AJJ" Value="AJJ/SR"></asp:ListItem>
<asp:ListItem Text="ED" Value="ED/SR"></asp:ListItem>
<asp:ListItem Text="RPM" Value="RPM/SR"></asp:ListItem>
<asp:ListItem Text="BZA" Value="BZA/SCR"></asp:ListItem>
<asp:ListItem Text="LGD" Value="LGD/SCR"></asp:ListItem>
<asp:ListItem Text="KZJ" Value="KZJ/SCR"></asp:ListItem>
<asp:ListItem Text="TATA" Value="TATA/SER"></asp:ListItem>
<asp:ListItem Text="BNDM" Value="BNDM/SER"></asp:ListItem>
<asp:ListItem Text="BKSC" Value="BKSC/SER"></asp:ListItem>
<asp:ListItem Text="SRC" Value="SRC/SER"></asp:ListItem>
<asp:ListItem Text="BIA" Value="BIA/SECR"></asp:ListItem>
<asp:ListItem Text="BRC" Value="BRC/WR"></asp:ListItem>
<asp:ListItem Text="BL" Value="BL/WR"></asp:ListItem>
<asp:ListItem Text="TKD" Value="TKD/WCR"></asp:ListItem>
<asp:ListItem Text="ET" Value="ET/WCR"></asp:ListItem>
<asp:ListItem Text="NKJ" Value="NKJ/WCR"></asp:ListItem>
<asp:ListItem Text="" Value=""></asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("rly_shed") %>'></asp:Label>
</ItemTemplate>
<ItemStyle Wrap="false" Width="80px"/>
</asp:TemplateField>
<asp:TemplateField HeaderText="Turned out Date" SortExpression="DO_clwout">
<EditItemTemplate>
<asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("DO_clwout", "{0:dd-MMM-yy}") %>' Width="80px"></asp:TextBox>
<asp:CalendarExtender ID="CalendarExtender1" TargetControlID="TextBox4" Format="dd-MMM-yy" runat="server">
</asp:CalendarExtender>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label4" runat="server"
Text='<%# Bind("DO_clwout", "{0:dd-MMM-yy}") %>'></asp:Label>
</ItemTemplate>
<ItemStyle Wrap="false" Width="50px"/>
</asp:TemplateField>
<asp:TemplateField HeaderText="Shed In Date" SortExpression="DO_shedIN">
<EditItemTemplate>
<asp:TextBox ID="TextBox5" runat="server" Text='<%# Bind("DO_shedIN", "{0:dd-MMM-yy}") %>' Width="80px"></asp:TextBox>
<asp:CalendarExtender ID="CalendarExtender4" TargetControlID="TextBox5" Format="dd-MMM-yy" runat="server">
</asp:CalendarExtender>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label5" runat="server"
Text='<%# Bind("DO_shedIN", "{0:dd-MMM-yy}") %>'></asp:Label>
</ItemTemplate>
<ItemStyle Wrap="false" Width="50px"/>
</asp:TemplateField>
<asp:TemplateField HeaderText="Date of Commissioning" SortExpression="DO_comm" Visible="false">
<EditItemTemplate>
<asp:TextBox ID="TextBox6" runat="server" Text='<%# Bind("DO_comm", "{0:dd-MMM-yy}") %>' Width="80px"></asp:TextBox>
<asp:CalendarExtender ID="CalendarExtender5" TargetControlID="TextBox6" Format="dd-MMM-yy" runat="server">
</asp:CalendarExtender>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label6" runat="server"
Text='<%# Bind("DO_comm", "{0:dd-MMM-yy}") %>'></asp:Label>
</ItemTemplate>
<ItemStyle Wrap="false" Width="50px"/>
</asp:TemplateField>
<asp:TemplateField HeaderText="Remarks" SortExpression="Remarks">
<EditItemTemplate>
<asp:TextBox ID="TextBox61" runat="server" Text='<%# Bind("Remarks") %>' Width="200px" TextMode="MultiLine" Height="70px"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label61" runat="server"
Text='<%# Bind("Remarks") %>' ></asp:Label>
</ItemTemplate>
<ItemStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="PDC" SortExpression="PDC">
<EditItemTemplate>
<asp:TextBox ID="TextBox66" runat="server" Text='<%# Bind("PDC", "{0:dd-MMM-yy}") %>' Width="80px"></asp:TextBox>
<asp:CalendarExtender ID="CalendarExtender7" TargetControlID="TextBox66" Format="dd-MMM-yy" runat="server">
</asp:CalendarExtender>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label66" runat="server"
Text='<%# Bind("PDC", "{0:dd-MMM-yy}") %>'></asp:Label>
</ItemTemplate>
<ItemStyle Wrap="false" Width="50px"/>
</asp:TemplateField>
<asp:BoundField DataField="D_CLW" HeaderText="No. of Days after turned out" ReadOnly="True" SortExpression="D_CLW" ></asp:BoundField>
<asp:TemplateField HeaderText="No. of Days after Shed IN"
SortExpression="D_inshed">
<ItemTemplate>
<asp:Label ID="Label7" runat="server" Text='<%# Bind("D_inshed") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("D_inshed") %>'></asp:Label>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<HeaderStyle BackColor="#990000" Font-Bold="True" Font-Names="Tahoma"
Font-Size="Small" ForeColor="#FFFFCC" HorizontalAlign="Justify"
VerticalAlign="Middle" Wrap="true" />
<PagerStyle ForeColor="#330099" HorizontalAlign="Center" BackColor="#FFFFCC" />
<RowStyle BackColor="White" Font-Names="Tahoma" Font-Size="Smaller"
ForeColor="Black" HorizontalAlign="Center" VerticalAlign="Middle" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<sortedascendingcellstyle backcolor="#FEFCEB" />
<sortedascendingheaderstyle backcolor="#AF0101" />
<sorteddescendingcellstyle backcolor="#F6F0C0" />
<sorteddescendingheaderstyle backcolor="#7E0000" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" CancelSelectOnNullParameter="false"
ConnectionString="<%$ ConnectionStrings:Loco_bankConnectionString %>"
DeleteCommand="DELETE FROM [Allotment] WHERE [ID] = @ID"
InsertCommand="INSERT INTO [Allotment] ([ID], [Loco_no], [DO_clwout], [Loco_type], [rly_shed], [DO_shedIN], [DO_comm], [Remarks], [PDC]) VALUES (@ID, @Loco_no, @DO_clwout, @Loco_type, @rly_shed, @DO_shedIN, @DO_comm, @Remarks, @PDC)"
SelectCommand="SELECT [ID], [Loco_no], [DO_clwout], [Loco_type], [rly_shed], [DO_shedIN], [DO_comm], [Remarks], [PDC],
CAST(DATEDIFF(DAY, DO_clwout, Getdate()) AS varchar(4)) AS 'D_CLW', CAST(DATEDIFF(DAY, DO_shedIN, Getdate()) AS varchar(4)) AS 'D_inshed'
FROM [Allotment] WHERE ([DO_clwout] IS NOT NULL AND [DO_comm] IS NULL) ORDER BY DO_clwout"