我在ASP.NET，C＃，SQL Server 2014 Express中设置了Listview。我还在我的数据库中设置了许多外键。当用户试图删除某些内容时，我想告诉他们“你不能删除这条记录，因为它存在于另一个表中”
当没有参照完整性冲突时，一切正常。
KitID将是此硬件表中其中一个外键的一个很好的示例。
非常感谢任何帮助。
非常新的ASP.NET，所以请不要在回复时承担太多的知识。谢谢！ ：）
以下代码
<div>
<asp:SqlDataSource ID="SqlDataSourceHardware" runat="server" OnUpdating="SqlDataSourceHardware_Updating" EnableCaching="False"
ConnectionString="<%$ ConnectionStrings:ApplicationServices %>"
DeleteCommand="DELETE FROM [Hardware] WHERE [HardwareID] = @HardwareID"
InsertCommand="INSERT INTO [Hardware] ([HardwareName], [NSN], [AssetNo], [SerialNo], [ModelNo], [LastStockCheck], [StockCheckFreqDays], [DisposedOfDate], [DisposedBy], [WarrantyExpDate], [SustainedBy], [OwnedBy], [IsVirtualMachine], [NonTechFreqDays], [LastNonTechDate], [NonTechInstructions], [SignedOutBy], [Location], [LoanedTo], [LoanedToLocation], [ExpectedLoanReturnDate], [ServiceabilityID], [KitID], [ImagePath], [ImagePathThumb]) VALUES (@HardwareName, @NSN, @AssetNo, @SerialNo, @ModelNo, @LastStockCheck, @StockCheckFreqDays, @DisposedOfDate, @DisposedBy, @WarrantyExpDate, @SustainedBy, @OwnedBy, @IsVirtualMachine, @NonTechFreqDays, @LastNonTechDate, @NonTechInstructions, @SignedOutBy, @Location, @LoanedTo, @LoanedToLocation, @ExpectedLoanReturnDate, @ServiceabilityID, @KitID, @ImagePath, @ImagePathThumb)"
UpdateCommand="UPDATE [Hardware] SET [HardwareName] = @HardwareName, [NSN] = @NSN, [AssetNo] = @AssetNo, [SerialNo] = @SerialNo, [ModelNo] = @ModelNo, [LastStockCheck] = @LastStockCheck, [StockCheckFreqDays] = @StockCheckFreqDays, [DisposedOfDate] = @DisposedOfDate, [DisposedBy] = @DisposedBy, [WarrantyExpDate] = @WarrantyExpDate, [SustainedBy] = @SustainedBy, [OwnedBy] = @OwnedBy, [IsVirtualMachine] = @IsVirtualMachine, [NonTechFreqDays] = @NonTechFreqDays, [LastNonTechDate] = @LastNonTechDate, [NonTechInstructions] = @NonTechInstructions, [SignedOutBy] = @SignedOutBy, [Location] = @Location, [LoanedTo] = @LoanedTo, [LoanedToLocation] = @LoanedToLocation, [ExpectedLoanReturnDate] = @ExpectedLoanReturnDate, [ImagePath] = @ImagePath, [ImagePathThumb] = @ImagePathThumb, [ServiceabilityID] = @ServiceabilityID, [KitID] = @KitID WHERE [HardwareID] = @HardwareID">
<DeleteParameters>
<asp:Parameter Name="HardwareID" Type="Int32" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="HardwareName" Type="String" />
<asp:Parameter Name="NSN" Type="String" />
<asp:Parameter Name="AssetNo" Type="String" />
<asp:Parameter Name="SerialNo" Type="String" />
<asp:Parameter Name="ModelNo" Type="String" />
<asp:Parameter Name="LastStockCheck" Type="String" />
<asp:Parameter Name="StockCheckFreqDays" Type="Int32" />
<asp:Parameter DbType="Date" Name="DisposedOfDate" />
<asp:Parameter Name="DisposedBy" Type="String" />
<asp:Parameter DbType="Date" Name="WarrantyExpDate" />
<asp:Parameter Name="SustainedBy" Type="String" />
<asp:Parameter Name="OwnedBy" Type="String" />
<asp:Parameter Name="IsVirtualMachine" Type="Boolean" />
<asp:Parameter Name="NonTechFreqDays" Type="Int32" />
<asp:Parameter DbType="Date" Name="LastNonTechDate" />
<asp:Parameter Name="NonTechInstructions" Type="String" />
<asp:Parameter Name="SignedOutBy" Type="String" />
<asp:Parameter Name="Location" Type="String" />
<asp:Parameter Name="LoanedTo" Type="String" />
<asp:Parameter Name="LoanedToLocation" Type="String" />
<asp:Parameter DbType="Date" Name="ExpectedLoanReturnDate" />
<asp:Parameter Name="ServiceabilityID" Type="Int32" />
<asp:Parameter Name="KitID" Type="Int32" />
<asp:Parameter Name="ImagePath" Type="String" />
<asp:Parameter Name="ImagePathThumb" Type="String" />
</InsertParameters>
<SelectParameters>
<asp:QueryStringParameter DefaultValue="1" Name="HardwareID"
QueryStringField="HardwareID" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="HardwareName" Type="String" />
<asp:Parameter Name="NSN" Type="String" />
<asp:Parameter Name="AssetNo" Type="String" />
<asp:Parameter Name="SerialNo" Type="String" />
<asp:Parameter Name="ModelNo" Type="String" />
<asp:Parameter Name="LastStockCheck" Type="String" />
<asp:Parameter Name="StockCheckFreqDays" Type="Int32" />
<asp:Parameter DbType="Date" Name="DisposedOfDate" />
<asp:Parameter Name="DisposedBy" Type="String" />
<asp:Parameter DbType="Date" Name="WarrantyExpDate" />
<asp:Parameter Name="SustainedBy" Type="String" />
<asp:Parameter Name="OwnedBy" Type="String" />
<asp:Parameter Name="IsVirtualMachine" Type="Boolean" />
<asp:Parameter Name="NonTechFreqDays" Type="Int32" />
<asp:Parameter DbType="Date" Name="LastNonTechDate" />
<asp:Parameter Name="NonTechInstructions" Type="String" />
<asp:Parameter Name="SignedOutBy" Type="String" />
<asp:Parameter Name="Location" Type="String" />
<asp:Parameter Name="LoanedTo" Type="String" />
<asp:Parameter Name="LoanedToLocation" Type="String" />
<asp:Parameter DbType="Date" Name="ExpectedLoanReturnDate" />
<asp:Parameter Name="ServiceabilityID" Type="Int32" />
<asp:Parameter Name="KitID" Type="Int32" />
<asp:Parameter Name="HardwareID" Type="Int32" />
<asp:Parameter Name="ImagePath" Type="String" />
<asp:Parameter Name="ImagePathThumb" Type="String" />
</UpdateParameters>
</asp:SqlDataSource>
<asp:FormView ID="FormView1" runat="server" DataKeyNames="HardwareID" OnItemDeleted="FormView1_OnDeletedItem"
DataSourceID="SqlDataSourceHardware"
EmptyDataText="No Information Available<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />">
<EditItemTemplate>
<table id="HardwareItem" class="table table-bordered span12">
<thead>
<tr>
<th colspan="2" class="span12">Details</th>
</tr>
</thead>
<tbody>
<tr>
<td class="span6">GeoQ ID:</td>
<td class="span6">
<asp:Label ID="HardwareIDLabel" runat="server"
Text='<%# Eval("HardwareID") %>' />
</td>
</tr>
<tr>
<td>Hardware Name:</td>
<td>
<asp:RequiredFieldValidator ID="HardwareNameValidator" runat="server" ErrorMessage="Hardware Name Required" ControlToValidate="HardwareNameTextBox" CssClass="ValidationError" Display="Dynamic" SetFocusOnError="True"></asp:RequiredFieldValidator>
<asp:TextBox ID="HardwareNameTextBox" runat="server" maxlength="100"
Text='<%# Bind("HardwareName") %>' />
</td>
</tr>
<tr>
<td>NSN:</td>
<td>
<asp:TextBox ID="NSNTextBox" runat="server" maxlength="50"
Text='<%# Bind("NSN") %>' />
</td>
</tr>
<tr>
<td>Asset No:</td>
<td>
<asp:TextBox ID="AssetNoTextBox" runat="server" maxlength="50"
Text='<%# Bind("AssetNo") %>' />
</td>
</tr>
<tr>
<td>Serial No:</td>
<td>
<asp:RequiredFieldValidator ID="SerialNoValidator" runat="server" ErrorMessage="Serial No Required" ControlToValidate="SerialNoTextBox" CssClass="ValidationError" Display="Dynamic" SetFocusOnError="True"></asp:RequiredFieldValidator>
<asp:TextBox ID="SerialNoTextBox" runat="server" maxlength="50"
Text='<%# Bind("SerialNo") %>' />
</td>
</tr>
<tr>
<td>Model No:</td>
<td>
<asp:RequiredFieldValidator ID="ModelNoValidator" runat="server" ErrorMessage="Model No Required" ControlToValidate="ModelNoTextBox" CssClass="ValidationError" Display="Dynamic" SetFocusOnError="True"></asp:RequiredFieldValidator>
<asp:TextBox ID="ModelNoTextBox" runat="server" maxlength="50"
Text='<%# Bind("ModelNo") %>' />
</td>
</tr>
<tr>
<td>Is This a Virtual Machine:</td>
<td>
<asp:CheckBox ID="IsVirtualMachineCheckBox" runat="server" Checked='<%# Bind("IsVirtualMachine") %>' />
</td>
</tr>
<tr>
<td>Serviceability:</td>
<td>
<asp:RequiredFieldValidator ID="ServiceabilityValidator" runat="server" ErrorMessage="Serviceability Required" ControlToValidate="DropDownListServiceability" CssClass="ValidationError" Display="Dynamic" SetFocusOnError="True"></asp:RequiredFieldValidator>
<asp:DropDownList ID="DropDownListServiceability" runat="server"
OnDataBound="AddNullValueToDropDownList_DataBound" AppendDataBoundItems="true"
DataSourceID="ServiceabilityList" DataTextField="ServiceabilityName" DataValueField="ServiceabilityID"
SelectedValue='<%# Bind("ServiceabilityID") %>'>
<asp:listitem value="" text="Select a value"></asp:listitem>
</asp:DropDownList>
<asp:SqlDataSource ID="ServiceabilityList" runat="server"
ConnectionString="<%$ ConnectionStrings:ApplicationServices %>"
SelectCommand="SELECT * FROM [Serviceability]">
</asp:SqlDataSource>
</td>
</tr>
<tr>
<td>Kit Name:</td>
<td>
<asp:DropDownList ID="DropDownList_Kit" runat="server"
OnDataBound="AddNullValueToDropDownList_DataBound" AppendDataBoundItems="true"
DataSourceID="KitList" DataTextField="KitName" DataValueField="KitID"
SelectedValue='<%# Bind("KitID") %>'>
<asp:listitem value="" text="Select a kit"></asp:listitem>
</asp:DropDownList>
<asp:SqlDataSource ID="KitList" runat="server"
ConnectionString="<%$ ConnectionStrings:ApplicationServices %>"
SelectCommand="SELECT * FROM [Kit]">
</asp:SqlDataSource>
</td>
</tr>
<tr>
<td>Image:</td>
<td>
<asp:FileUpload ID="ImageFileUpload" AllowMultiple="false" ClientIDMode="Static" runat="server" />
<asp:HiddenField ID="ImagePathHdn" ClientIDMode="Static" runat="server" Value='<%# Bind("ImagePath") %>' />
<asp:HiddenField ID="ImagePathThumbHdn" ClientIDMode="Static" runat="server" Value='<%# Bind("ImagePathThumb") %>' />
<asp:HiddenField ID="DBImagePath" ClientIDMode="Static" runat="server" Value='<%# Bind("fullPath") %>' />
<asp:HiddenField ID="DBImagePathThumb" ClientIDMode="Static" runat="server" Value='<%# Bind("fullPathThumb") %>' />
<div id="uploadPreview"><a rel="prettyPhoto" title="<%# Eval("HardwareName") %>" href="<%# Request.ApplicationPath + Eval("ImagePath")%>"><img ID="imgPreview" src="<%# Request.ApplicationPath + Eval("ImagePathThumb") + "?" + DateTime.Now.Ticks.ToString() %>" class="imgPreview img-rounded" onError="this.src='images/NoImage.png';" /></a></div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="nopad">
<table id="Governance" class="table table-bordered span12">
<thead>
<tr>
<th colspan="2" class="span12">Governance</th>
</tr>
</thead>
<tbody>
<tr>
<td class="span6">Last Stock Check Date:</td>
<td class="span6">
<asp:TextBox ID="LastStockCheck_aspnetdatepicker" runat="server"
Text='<%# Bind("LastStockCheck", "{0:dd MMM yyyy}") %>' />
</td>
</tr>
<tr>
<td>Stock Check Frequency (Days):</td>
<td>
<asp:RangeValidator ID="StockCheckFreqDaysValidator" runat="server" ErrorMessage="Range must be between 1 and 1000" MaximumValue="1000" MinimumValue="1" SetFocusOnError="True" CssClass="ValidationError" ControlToValidate="StockCheckFreqDaysTextBox" Type="Integer"></asp:RangeValidator>
<asp:TextBox ID="StockCheckFreqDaysTextBox" runat="server"
Text='<%# Bind("StockCheckFreqDays") %>' />
</td>
</tr>
<tr>
<td>Disposed Of Date:</td>
<td>
<asp:TextBox ID="DisposedOfDate_aspnetdatepicker" runat="server"
Text='<%# Bind("DisposedOfDate", "{0:dd MMM yyyy}") %>' />
</td>
</tr>
<tr>
<td>Disposed By:</td>
<td>
<asp:DropDownList ID="DropDownList_DisposedBy" runat="server"
OnDataBound="AddNullValueToDropDownList_DataBound" AppendDataBoundItems="true"
DataSourceID="ProfileList" DataTextField="UserName" DataValueField="UserId"
SelectedValue='<%# Bind("DisposedBy") %>'>
<asp:listitem value="" text="Select a person"></asp:listitem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td>Warranty Expiry Date:</td>
<td>
<asp:TextBox ID="WarrantyExpDate_aspnetdatepicker" runat="server"
Text='<%# Bind("WarrantyExpDate", "{0:dd MMM yyyy}") %>' />
</td>
</tr>
<tr>
<td>Non-Tech Frequency (Days):</td>
<td>
<asp:RangeValidator ID="NonTechFreqDaysTextBoxValidator" runat="server" ErrorMessage="Range must be between 1 and 1000" MaximumValue="1000" MinimumValue="1" SetFocusOnError="True" CssClass="ValidationError" ControlToValidate="NonTechFreqDaysTextBox" Type="Integer"></asp:RangeValidator>
<asp:TextBox ID="NonTechFreqDaysTextBox" runat="server"
Text='<%# Bind("NonTechFreqDays") %>' />
</td>
</tr>
<tr>
<td>Last Non-Tech Date:</td>
<td>
<asp:TextBox ID="LastNonTechDate_aspnetdatepicker" runat="server"
Text='<%# Bind("LastNonTechDate", "{0:dd MMM yyyy}") %>' />
</td>
</tr>
<tr>
<td>Non-Tech Instructions:</td>
<td>
<asp:TextBox ID="NonTechInstructionstextarea" runat="server"
TextMode="MultiLine" Text='<%# Bind("NonTechInstructions") %>'></asp:TextBox>
</td>
</tr>
</tbody>
</table>
</div>
<div class="nopad">
<table id="Ownership" class="table table-bordered span12">
<thead>
<tr>
<th colspan="2" class="span12">Ownership</th>
</tr>
</thead>
<tbody>
<tr>
<td class="span6">Sustained By:</td>
<td class="span6">
<asp:DropDownList ID="DropDownList_SustainedBy" runat="server"
OnDataBound="AddNullValueToDropDownList_DataBound" AppendDataBoundItems="true"
DataSourceID="RoleList" DataTextField="RoleName" DataValueField="RoleId"
SelectedValue='<%# Bind("SustainedBy") %>'>
<asp:listitem value="" text="Select a group"></asp:listitem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td>Owned By:</td>
<td>
<asp:RequiredFieldValidator ID="OwnerdByValidator" runat="server" ErrorMessage="Owned By Required" ControlToValidate="DropDownList_OwnedBy" CssClass="ValidationError" Display="Dynamic" SetFocusOnError="True"></asp:RequiredFieldValidator>
<asp:DropDownList ID="DropDownList_OwnedBy" runat="server"
OnDataBound="AddNullValueToDropDownList_DataBound" AppendDataBoundItems="true"
DataSourceID="RoleList" DataTextField="RoleName" DataValueField="RoleId"
SelectedValue='<%# Bind("OwnedBy") %>'>
<asp:listitem value="" text="Select a group"></asp:listitem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td>Signed Out By:</td>
<td>
<asp:RequiredFieldValidator ID="SignedOutByValidator" runat="server" ErrorMessage="Signed Out By Required" ControlToValidate="DropDownList_SignedOutBy" CssClass="ValidationError" Display="Dynamic" SetFocusOnError="True"></asp:RequiredFieldValidator>
<asp:DropDownList ID="DropDownList_SignedOutBy" runat="server"
OnDataBound="AddNullValueToDropDownList_DataBound" AppendDataBoundItems="true"
DataSourceID="ProfileList" DataTextField="UserName" DataValueField="UserId"
SelectedValue='<%# Bind("SignedOutBy") %>'>
<asp:listitem value="" text="Select a person"></asp:listitem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td>Location:</td>
<td>
<asp:TextBox ID="LocationTextBox" runat="server" maxlength="50"
Text='<%# Bind("Location") %>' />
</td>
</tr>
<tr>
<td>Loaned To:</td>
<td>
<asp:DropDownList ID="DropDownList_LoanedTo" runat="server"
OnDataBound="AddNullValueToDropDownList_DataBound" AppendDataBoundItems="true"
DataSourceID="ProfileList" DataTextField="UserName" DataValueField="UserId"
SelectedValue='<%# Bind("LoanedTo") %>'>
<asp:listitem value="" text="Select a person"></asp:listitem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td>Loaned To Location:</td>
<td>
<asp:TextBox ID="LoanedToLocationTextBox" runat="server" maxlength="50"
Text='<%# Bind("LoanedToLocation") %>' />
</td>
</tr>
<tr>
<td>Expected Loan Return Date:</td>
<td>
<asp:TextBox ID="ExpectedLoanReturnDate_aspnetdatepicker" runat="server"
Text='<%# Bind("ExpectedLoanReturnDate", "{0:dd MMM yyyy}") %>' />
</td>
</tr>
</tbody>
</table>
<asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CssClass="btn marginR10 marginB10"
CommandName="Update" Text="Update" />
<asp:LinkButton ID="UpdateCancelButton" runat="server" CssClass="btn marginR10 marginB10"
CausesValidation="False" CommandName="Cancel" Text="Cancel" />
<asp:LinkButton ID="DeleteButton_aspnetSimpleConfirmDelete" runat="server" OnClick="DeleteButton_aspnetSimpleConfirmDelete_Click" CausesValidation="False" CssClass="btn btn-danger marginR10 marginB10"
OnClientClick="return confirm('Are you sure you want to delete this record?');"
CommandName="Delete" Text="<span class='icomoon-icon-remove white'></span> Delete " />
</EditItemTemplate>
</asp:FormView>
<asp:SqlDataSource ID="ProfileList" runat="server" ConnectionString="<%$ ConnectionStrings:ApplicationServices %>" SelectCommand="SELECT UserId, UserName FROM [aspnet_Users] ORDER BY UserName ASC"></asp:SqlDataSource>
<asp:SqlDataSource ID="RoleList" runat="server" ConnectionString="<%$ ConnectionStrings:ApplicationServices %>" SelectCommand="SELECT [RoleName], [RoleId] FROM [vw_aspnet_Roles]"></asp:SqlDataSource>
<br />
</div>
答案 0 :(得分：0)
数据库是否设计了参照完整性？如果没有，请这样做。
然后只需触发delete命令，并实现SqlDataSource.Deleted事件。您将找到一个事件参数，该参数包含一个例外，以防参照完整性拒绝删除记录。然后您可以通知您的用户。
答案 1 :(得分：0)
如果相关表具有与父表相关的id，则可以在删除命令之前检查子表的记录是否存在。如果存在，则可以通知用户存在哪个值。