当条目有效时，在emptydatatemplate中触发gridview验证

Question

我有一个 Gridview，它有 3 列，ID、Text、Action。我正在使用VS2010。当网格为空并且用户在文本字段中输入文本时，我希望将该字段验证为必填字段和最大值。长度。如果网格中有数据，这些验证可以正常工作，但是当网格为空时，在用户输入数据后会触发所需的验证。如果用户第二次输入，则数据成功添加到数据库并在网格中刷新。

其次，即使我有以下属性，当网格为空时，列标题也不会显示：ShowHeaderWhenEmpty="true" 这是我的标记：

<asp:GridView ID="SubjectInfoGridView" runat="server" 
        AutoGenerateColumns="false" Caption="Personal Subject List" 
        CaptionAlign="Top" CssClass="grid"
        RowStyle-Wrap="true" HorizontalAlign="Left" ShowFooter="true" 
        AllowPaging="false" PageSize="5" ShowHeaderWhenEmpty="true" 
        onrowcancelingedit="SubjectInfoGridView_RowCancelingEdit" 
        onrowediting="SubjectInfoGridView_RowEditing" 
        onrowdeleting="SubjectInfoGridView_RowDeleting" 
        onrowcommand="SubjectInfoGridView_RowCommand" 
        onrowupdating="SubjectInfoGridView_RowUpdating">
        <Columns>
            <asp:TemplateField HeaderText="Subject ID">
                <ItemTemplate>
                    <asp:Label ID="sigvLblSubjectID" runat="server" Text='<%# Bind("SubjectID") %>'></asp:Label>
                </ItemTemplate>
             </asp:TemplateField>
             <asp:TemplateField HeaderText="Subject" ItemStyle-Wrap="false"> 
             <ItemTemplate>
                    <asp:Label ID="sigvLblSubject" runat="server" Text='<%# Bind("Subject") %>'></asp:Label>
             </ItemTemplate>
             <EditItemTemplate>
                <asp:TextBox ID="sigvTxtBoxEditSubject" runat="server" Text='<%# Bind("Subject") %>'></asp:TextBox>      
                     <asp:RequiredFieldValidator ID="RequiredFieldEditSubject" ControlToValidate="sigvTxtBoxEditSubject" runat="server"
                        ErrorMessage="Required field." ValidationGroup="EditSubjectValidation" Display="Dynamic" CssClass="message-error">
                    </asp:RequiredFieldValidator>            
                     <asp:RegularExpressionValidator ID="MaxValEditSubject" ControlToValidate="sigvTxtBoxEditSubject" runat="server"
                        ErrorMessage="Maximumn length is 80." ValidationGroup="EditSubjectValidation" Display="Dynamic" CssClass="message-error"
                        ValidationExpression="^.{1,80}$" >
                    </asp:RegularExpressionValidator>
             </EditItemTemplate>
             <FooterTemplate>
                    <asp:TextBox ID="sigvTxtBoxInsertSubject" runat="server" Text='<%# Bind("Subject") %>'></asp:TextBox>      
                     <asp:RequiredFieldValidator ID="RequiredFieldInsertSubject" ControlToValidate="sigvTxtBoxInsertSubject" runat="server"
                        ErrorMessage="Required field." ValidationGroup="InsertSubjectValidation" Display="Dynamic" CssClass="message-error">
                    </asp:RequiredFieldValidator>            
                     <asp:RegularExpressionValidator ID="MaxValInsertSubject" ControlToValidate="sigvTxtBoxInsertSubject" runat="server"
                        ErrorMessage="Maximumn length is 80." ValidationGroup="InsertSubjectValidation" Display="Dynamic" CssClass="message-error"
                        ValidationExpression="^.{1,80}$" >
                    </asp:RegularExpressionValidator>
             </FooterTemplate>
             </asp:TemplateField>
             <asp:TemplateField HeaderText="Action" ItemStyle-Wrap="false" ItemStyle-HorizontalAlign="Center">
                 <ItemTemplate>
                    <asp:Button ID="sigvEditButton" runat="server" CausesValidation="False" CommandName="Edit" 
                                Text="Edit" CssClass="gridActionbutton">
                    </asp:Button>
                    &nbsp;<asp:Button ID="sigvDeleteButton" runat="server" CausesValidation="False" CommandName="Delete" 
                                Text="Delete" CssClass="gridActionbutton"  OnClientClick="return confirm('Are you sure you want to delete this Device Information?')" >
                    </asp:Button>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:Button ID="sigvUpdateButton" runat="server" CausesValidation="True" ValidationGroup="EditSubjectValidation" CommandName="Update" 
                                    Text="Update" CssClass="gridActionbutton"></asp:Button>
                    &nbsp;<asp:Button ID="sigvCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" 
                                    Text="Cancel" CssClass="gridActionbutton"></asp:Button>
                </EditItemTemplate>                  
                <FooterTemplate>
                    <asp:Button ID="sigvAddButton" runat="server" CommandName="Add" Text="Add Subject" Width="90%" CausesValidation="true" 
                                CssClass="gridActionbutton" ValidationGroup="InsertSubjectValidation">
                    </asp:Button>
                </FooterTemplate>
            </asp:TemplateField>
       </Columns>
       <EmptyDataTemplate>
        <tr> 
            <td colspan="3" style="text-align:center;">
                No User-defined Subjects were found for you. Subjects can be added by clicking the 'Add Subject' Button.
            </td> 
        </tr>
        <tr>
            <td></td>
            <td>
                <asp:TextBox ID="sigvTxtBoxInsertSubject" runat="server" Text='<%# Bind("Subject") %>' Width="90%"></asp:TextBox>      
                <asp:RequiredFieldValidator ID="RequiredFieldInsertSubjectEmpty" ControlToValidate="sigvTxtBoxInsertSubject" runat="server"
                        ErrorMessage="Required field." ValidationGroup="InsertSubjectValidation" Display="Dynamic" CssClass="message-error">
                </asp:RequiredFieldValidator>            
                <asp:RegularExpressionValidator ID="MaxValInsertSubjectEmpty" ControlToValidate="sigvTxtBoxInsertSubject" runat="server"
                        ErrorMessage="Maximumn length is 80." ValidationGroup="InsertSubjectValidation" Display="Dynamic" CssClass="message-error"
                        ValidationExpression="^.{1,80}$" >
                </asp:RegularExpressionValidator>              
            </td>
            <td>
                <asp:Button ID="sigvAddButtonEmpty" runat="server" CommandName="Add" Text="Add Subject" Width="90%" CausesValidation="true" 
                        CssClass="gridActionbutton" ValidationGroup="InsertSubjectValidation">
                </asp:Button>
            </td>
        </tr>
       </EmptyDataTemplate>
    </asp:GridView>

那么，为什么当网格为空时标题不显示？在字段中输入数据后触发RequiredValidation的验证我做错了什么？

谢谢！

更新 我解决了“标题问题”，但只是将它们添加到 EmptyDataTemplate。但是验证仍然是一个问题。 我在另一家公司使用 VS2012 做到了这一点，这不是问题。我尝试使 TextBox id 与 Insert ID 不同，但仍然出现相同的错误。

Answer 1

我想通了... 万一其他人有这个问题。 为了更正验证，我删除了文本绑定 (Text='')。然后，当我在有数据时添加一行时，我将主题字段的 ID 更改为与页脚中的 ID 相同。这允许我只检查 RowBound 事件中的一个控件。 这是 EmptyDataTemplate 中的数据行：

<tr>
            <td></td>
            <td>
                <asp:TextBox ID="sigvTxtBoxInsertSubject" runat="server" Width="90%"></asp:TextBox>      
                <asp:RequiredFieldValidator ID="RequiredFieldInsertSubjectEmpty" ControlToValidate="sigvTxtBoxInsertSubject" runat="server"
                        ErrorMessage="Required field." ValidationGroup="InsertSubjectValidationEmpty" Display="Dynamic" CssClass="message-error">
                </asp:RequiredFieldValidator>            
                <asp:RegularExpressionValidator ID="MaxValInsertSubjectEmpty" ControlToValidate="sigvTxtBoxInsertSubject" runat="server"
                        ErrorMessage="Maximumn length is 80." ValidationGroup="InsertSubjectValidationEmpty" Display="Dynamic" CssClass="message-error"
                        ValidationExpression="^.{1,80}$" >
                </asp:RegularExpressionValidator>                              
            </td>
            <td>
                <asp:Button ID="sigvAddButtonEmpty" runat="server" CommandName="Add" Text="Add Subject" Width="90%" CausesValidation="true" 
                        CssClass="gridActionbutton" ValidationGroup="InsertSubjectValidationEmpty" >
                </asp:Button>
            </td>
        </tr>