我有一个gridview与“编辑”TemplateField 相关的一个。当用户单击它时，它会打开一个 ModalPop Up 以编辑网格的当前行记录。第一次它工作正常并且当 modalPopUp 关闭并且用户再次单击同一个 LinkButton 时，它不起作用得到异常。调试后我发现第二次它们是 当前选定行中的标签未初始化。请建议我如何解决这个问题，因为它非常紧急。LinkButtonItemTemplateCommandNameLinkButtonobject reference not set to an instance of an objectlblUserID
请在下面找到代码：-
<cc1:GridView ID="gvUser" runat="server" AutoGenerateColumns="False" AllowSorting="True"
CssClass="grid" OnDataBound="gvUser_DataBound" DataSourceID="odsUserDetails"
AllowPaging="True" ShowFooter="false" OnRowCancelingEdit="gvUser_RowCancelingEdit"
OnRowCommand="gvUser_RowCommand" OnRowDeleting="gvUser_RowDeleting"
OnSelectedIndexChanged="gvUser_SelectedIndexChanged"
OnRowDataBound="gvUser_RowDataBound" Height="385px" Width="900px" EnableViewState="false">
<AlternatingRowStyle CssClass="altrowstyle" />
<HeaderStyle CssClass="headerstyle" />
<RowStyle CssClass="rowstyle" Wrap="false" />
<EmptyDataRowStyle BackColor="#edf5ff" Height="300px" VerticalAlign="Middle" HorizontalAlign="Center" />
<Columns>
<asp:TemplateField HeaderText="UserID" SortExpression="userID" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White" Visible="false">
<ItemTemplate>
<asp:Label ID="lblUserID" runat="server" Text='<%#Eval("userID") %>' CssClass="GridContent" />
</ItemTemplate>
<EditItemTemplate>
<asp:Label ID="lblEditUserID" runat="server" Text='<%#Eval("userID") %>' Style="width: 50px;"
CssClass="GridContent" />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="E Code" SortExpression="userecode" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White" ItemStyle-Width="100px">
<ItemTemplate>
<asp:Label ID="lblUserECode" runat="server" Text='<%#Eval("UserECode") %>' CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAddECode" runat="server" Style="width: 50px;" CssClass="GridContent" />
<asp:RegularExpressionValidator ID="REVAddECode" runat="server" ControlToValidate="txtAddECode"
ErrorMessage="*" Style="color: Red;" ValidationExpression="^\d+$" ToolTip="E Code must be numeric value only.">
</asp:RegularExpressionValidator>
<asp:RequiredFieldValidator ID="RFVAddECode" runat="server" ErrorMessage="*" ControlToValidate="txtAddECode"
Style="color: Red;" ToolTip="E CodeCan't be left empty.">
</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="User Name" SortExpression="username" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White" ItemStyle-Width="150px">
<ItemTemplate>
<asp:Label ID="lblUserName" runat="server" Text='<%#Eval("UserName") %>' CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAddUserName" runat="server" Style="width: 150px;" CssClass="GridContent" />
<asp:RequiredFieldValidator ID="RFVAddUserName" runat="server" ErrorMessage="*" ControlToValidate="txtAddUserName"
Style="color: Red;" ToolTip="User Name can't be left empty.">
</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Enable/Disable" SortExpression="IsFlagEnabled" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label ID="lblIsFlagEnabled" runat="server" Text='<%# (bool)Eval("IsFlagenabled") == true ? "Disable" : "Enable" %>'
CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlAddIsFlagEnabled" runat="server" AutoPostBack="true" Style="width: auto;"
CssClass="GridContent">
<asp:ListItem Text="Enable" Value="0" />
<asp:ListItem Text="Disable" Value="1" />
</asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Email Address" SortExpression="EmailAddress" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White" Visible="false">
<ItemTemplate>
<asp:Label ID="lblEmailAddress" runat="server" Text='<%#Eval("EmailAddress") %>'
CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAddEmailAddress" runat="server" Style="width: 150px;" CssClass="GridContent" />
<asp:RegularExpressionValidator ID="REVAddEmailAddress" runat="server" ControlToValidate="txtAddEmailAddress"
ErrorMessage="*" Style="color: Red;" ValidationExpression="^[a-z0-9_\+-]+(\.[a-z0-9_\+-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*\.([a-z]{2,4})$"
ToolTip="Not a valid Email Address">
</asp:RegularExpressionValidator>
<asp:RequiredFieldValidator ID="RFVAddEmailAddress" runat="server" ErrorMessage="*"
ControlToValidate="txtAddEmailAddress" Style="color: Red;" ToolTip="Email Can't be left empty.">
</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Designation" SortExpression="Designation" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White" ItemStyle-Width="100px">
<ItemTemplate>
<asp:Label ID="lblDesignation" runat="server" Text='<%#Eval("Designation") %>' CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAddDesignation" runat="server" Style="width: 150px;" CssClass="GridContent" />
<asp:RequiredFieldValidator ID="RFVAddDesignation" runat="server" ErrorMessage="*"
ControlToValidate="txtAddDesignation" Style="color: Red;" ToolTip="Designation Can't be left empty.">
</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Role ID" SortExpression="RoleID" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:Label ID="lblRoleID" runat="server" Text='<%#Eval("RoleID") %>' CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlAddRole" runat="server" AutoPostBack="true" Style="width: auto;"
CssClass="GridContent">
<asp:ListItem Text="Standard" Value="1" />
<asp:ListItem Text="TL/TC" Value="2" />
<asp:ListItem Text="AM" Value="3" />
<asp:ListItem Text="OM" Value="4" />
<asp:ListItem Text="Sr OM" Value="5" />
<asp:ListItem Text="Admin" Value="6" />
</asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Shift Start Time" SortExpression="ShiftStartTime"
HeaderStyle-Font-Bold="true" HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White"
Visible="true">
<ItemTemplate>
<asp:Label ID="lblShiftStartTime" runat="server" Text='<%#Eval("ShiftStartTime") %>'
CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAddShiftStartTime" runat="server" Text='<%#Eval("ShiftStartTime") %>'
Style="width: 65px;" CssClass="GridContent" />
<asp:RegularExpressionValidator ID="RegularExpValidatorddlAddShiftStartTime" runat="server"
ControlToValidate="txtAddShiftStartTime" ValidationExpression="^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$"
ErrorMessage="*" Font-Bold="true" ForeColor="Red" ToolTip="Must be in HH:MM" />
<asp:RequiredFieldValidator ID="RFVAddShiftStartEdit" runat="server" ControlToValidate="txtAddShiftStartTime"
ErrorMessage="*" Font-Bold="true" ForeColor="Red" ToolTip="Shift Start Time can't be left empty.">
</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Shift End Time" SortExpression="ShiftEndTime" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White" Visible="true">
<ItemTemplate>
<asp:Label ID="lblShiftEndTime" runat="server" Text='<%#Eval("ShiftEndTime") %>'
CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAddShiftEndTime" runat="server" Text='<%#Eval("ShiftEndTime") %>'
Style="width: 65px;" CssClass="GridContent" />
<asp:RegularExpressionValidator ID="RegularExpValidatorddlAddShiftEndTime" runat="server"
ControlToValidate="txtAddShiftEndTime" ValidationExpression="^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$"
ErrorMessage="*" Font-Bold="true" ForeColor="Red" ToolTip="Must be in HH:MM" />
<asp:RequiredFieldValidator ID="RFVAddShiftEndTimeEdit" runat="server" ControlToValidate="txtAddShiftEndTime"
ErrorMessage="*" Font-Bold="true" ForeColor="Red" ToolTip="Shift End Time can't be left empty.">
</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Saturday Shift Start Time" SortExpression="WeekendShiftStartTime"
HeaderStyle-Font-Bold="true" HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White"
Visible="true">
<ItemTemplate>
<asp:Label ID="lblWeekendShiftStartTime" runat="server" Text='<%#Eval("WeekendShiftStartTime") %>'
CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAddWeekendShiftStartTime" runat="server" Text='<%#Eval("WeekendShiftStartTime") %>'
Style="width: 65px;" CssClass="GridContent" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Saturday Shift End Time" SortExpression="weekendshiftendtime"
HeaderStyle-Font-Bold="true" HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White"
Visible="true">
<ItemTemplate>
<asp:Label ID="lblWeekendShiftEndTime" runat="server" Text='<%#Eval("weekendshiftendtime") %>'
CssClass="GridContent" />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAddWeekendShiftEndTime" runat="server" Text='<%#Eval("weekendshiftendtime") %>'
Style="width: 65px;" CssClass="GridContent" />
<asp:RegularExpressionValidator ID="RegularExpValidatorAddddlWeekendShiftEndTime"
runat="server" ControlToValidate="txtAddWeekendShiftEndTime" ValidationExpression="^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$"
ErrorMessage="*" Font-Bold="true" ForeColor="Red" ToolTip="Must be in HH:MM" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Immediate Supervisor" SortExpression="BossName" HeaderStyle-Font-Bold="true"
HeaderStyle-Font-Names="Calibre" HeaderStyle-ForeColor="White" ControlStyle-Width="120px">
<ItemTemplate>
<asp:Label ID="lblSupervisorName" runat="server" CssClass="GridContent" Text='<%#Eval("BossName") %>' />
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlAddImmediateSupervisor" runat="server" AutoPostBack="true"
Style="width: auto;" CssClass="GridContent" DataSourceID="" DataTextField="UserName"
DataValueField="UserECode" AppendDataBoundItems="True">
</asp:DropDownList>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Select" HeaderStyle-Font-Bold="true" HeaderStyle-Font-Names="Calibre"
HeaderStyle-ForeColor="White">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Edit"
Text="Edit" ForeColor="White" OnClick='LinkButton1_Click'>
</asp:LinkButton>
</ItemTemplate>
<FooterTemplate>
</FooterTemplate>
</asp:TemplateField>
</Columns>
<PagerTemplate>
<table width="100%">
<tr>
<td style="text-align: left">
Page Size:
<asp:DropDownList ID="ddPageSize" runat="server" EnableViewState="true" OnSelectedIndexChanged="ddPageSize_SelectedIndexChanged"
AutoPostBack="true" Style="width: 50px;">
<asp:ListItem Text="10"></asp:ListItem>
<asp:ListItem Text="25"></asp:ListItem>
<asp:ListItem Text="50"></asp:ListItem>
<asp:ListItem Text="75"></asp:ListItem>
<asp:ListItem Text="100"></asp:ListItem>
</asp:DropDownList>
</td>
<td style="text-align: right">
<asp:Label ID="lblPageCount" runat="server"></asp:Label>
</td>
</tr>
</table>
</PagerTemplate>
</cc1:GridView>
C#代码：-
protected void gvUser_RowCommand(object sender, GridViewCommandEventArgs e)
{
try
{
if (e.CommandName.Equals("Edit"))
{
Control ctrl = e.CommandSource as Control;
if (ctrl != null)
{
GridViewRow _currenrtrow = ctrl.Parent.NamingContainer as GridViewRow;
Label lblUserID = (Label)_currenrtrow.FindControl("lblUserID");
string userID = lblUserID.Text.ToString();
ScriptManager.RegisterStartupScript(this.Page, Page.GetType(), "OpenModalDialog", "<script type='text/javascript'>window.showModalDialog('Userinfo.aspx?code=" + userID.ToString() + "', null, 'unadorned:yes ;resizable:0 ;dialogWidth:800px ;dialogHeight:550px ;status:no ;scroll:no ;status=no;');</script>", false);
}
}
if (e.CommandName.Equals("Select"))
{
}
}
catch (Exception ex)
{
throw ex;
}
}