GridView中的刪除命令問題 - 必須聲明標量

Question

我一直在這個gridview上工作，它似乎像一切都應該工作，但我得到一個錯誤「必須聲明標量變量」，當我執行刪除命令。真奇怪的是，如果我刪除現有的更新命令並將刪除命令轉換爲更新命令，它將起作用並刪除該記錄。任何想法爲什麼它作爲更新而不是刪除？我使用.NET 3.5

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="Project_List" 
     Width="800px" EditRowStyle-Width="800px" RowStyle-BackColor="#D8D8D8" AlternatingRowStyle-BackColor="#ffffff"> 
     <Columns> 
      <asp:TemplateField HeaderText="Updates"> 
       <ItemTemplate> 
        <asp:ImageButton ID="gridEditButton" runat="server" CommandName="Edit" ImageUrl="~/images/edit.png" /> 
        <asp:ImageButton ID="gridDeleteButton" runat="server" CommandName="Delete" ImageUrl="~/images/cancel.png" OnClientClick="return confirm('Are you sure you want to delete this record?');" /> 
       </ItemTemplate> 
       <EditItemTemplate> 
        <asp:ImageButton ID="gridUpdateButton" runat="server" CommandName="Update" ImageUrl="~/images/save.png" /> 
        <asp:ImageButton ID="gridCancelButton" runat="server" CommandName="Cancel" ImageUrl="~/images/cancel.png" /> 
       </EditItemTemplate> 
      </asp:TemplateField> 

      <asp:BoundField DataField="project_id" ItemStyle-CssClass="hiddencol" HeaderStyle-CssClass="hiddencol" /> 
      <asp:BoundField DataField="functional_sponsor" HeaderText="Functional Sponsor" SortExpression="functional_sponsor" /> 
      <asp:BoundField DataField="program_name" HeaderText="Program" SortExpression="program_name" /> 
      <asp:BoundField DataField="project_name" HeaderText="Project" SortExpression="project_name" /> 
      <asp:BoundField DataField="approval_status" HeaderText="Approval Status" SortExpression="approval_status" /> 
      <asp:BoundField DataField="approved_date" HeaderText="Approved Date" SortExpression="approved_date" /> 
      <asp:BoundField DataField="approved_by" HeaderText="Approved By" SortExpression="approved_by" /> 
      <asp:BoundField DataField="charge_code" HeaderText="Charge Code" SortExpression="charge_code" /> 
      <asp:BoundField DataField="open_date" HeaderText="Open Date" SortExpression="open_date" /> 
      <asp:BoundField DataField="close_date" HeaderText="Close Date" SortExpression="close_date" /> 
      <asp:BoundField DataField="project_sponsor" HeaderText="Sponsor" SortExpression="project_sponsor" /> 
      <asp:BoundField DataField="project_manager" HeaderText="Project Manager" SortExpression="project_manager" /> 
      <asp:BoundField DataField="technical_lead" HeaderText="Technical Lead" SortExpression="technical_lead" /> 
      <asp:BoundField DataField="approved_amount" HeaderText="Approved Amount ($K)" SortExpression="approved_amount" /> 
      <asp:BoundField DataField="requested_amount" HeaderText="Requested Amount ($K)" SortExpression="requested_amount" /> 
     </Columns> 
    </asp:GridView> 
    <asp:SqlDataSource ID="Project_List" runat="server" 
     ConnectionString="<%$ ConnectionStrings:ProjectDB %>" 
     SelectCommand="SELECT * FROM [vw_IT_Portfolio] ORDER BY [functional_sponsor], [program_name], [project_name]" 
     DeleteCommand="EXEC [Utilities_SN].[dbo].[sp_Delete_ITPortfolio_Record] @projectID = @project_id" 
     UpdateCommand="EXEC [Utilities_SN].[dbo].[sp_Update_ITPortfolio_Record] 
         @projectID = @project_id 
         ,@functionalSponsor = @functional_sponsor 
         ,@program = @program_name 
         ,@projectName = @project_name 
         ,@approvalStatus = @approval_status 
         ,@approvedDate = @approved_date 
         ,@approvedBy = @approved_by 
         ,@chargeCode = @charge_code 
         ,@openDate = @open_date 
         ,@closeDate = @close_date 
         ,@sponsor = @project_sponsor 
         ,@projectManager = @project_manager 
         ,@technicalLead = @technical_lead 
         ,@approvedAmount = @approved_amount"> 
     <DeleteParameters> 
      <asp:Parameter Type="Int32" Name="project_id"></asp:Parameter> 
     </DeleteParameters> 
     <UpdateParameters> 
      <asp:Parameter Type="Int32" Name="project_id"></asp:Parameter> 
      <asp:Parameter Type="String" Name="functional_sponsor"></asp:Parameter> 
      <asp:Parameter Type="String" Name="program_name"></asp:Parameter> 
      <asp:Parameter Type="String" Name="project_name"></asp:Parameter> 
      <asp:Parameter Type="String" Name="approval_status"></asp:Parameter> 
      <asp:Parameter Type="String" Name="approved_date"></asp:Parameter> 
      <asp:Parameter Type="String" Name="approved_by"></asp:Parameter> 
      <asp:Parameter Type="String" Name="charge_code"></asp:Parameter> 
      <asp:Parameter Type="String" Name="open_date"></asp:Parameter> 
      <asp:Parameter Type="String" Name="close_date"></asp:Parameter> 
      <asp:Parameter Type="String" Name="project_sponsor"></asp:Parameter> 
      <asp:Parameter Type="String" Name="project_manager"></asp:Parameter> 
      <asp:Parameter Type="String" Name="technical_lead"></asp:Parameter> 
      <asp:Parameter Type="Decimal" Name="approved_amount"></asp:Parameter> 
     </UpdateParameters> 
    </asp:SqlDataSource> 

Answer 1

在GridView控件設置的DataKeyNames = PROJECT_ID

ASPX頁面：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="Project_List" 
    Width="800px" EditRowStyle-Width="800px" RowStyle-BackColor="#D8D8D8" 
    AlternatingRowStyle-BackColor="#ffffff" DataKeyNames="project_id"> 
    <Columns> 
     <asp:TemplateField HeaderText="Updates"> 
      <ItemTemplate> 
       <asp:ImageButton ID="gridEditButton" runat="server" CommandName="Edit" ImageUrl="~/images/edit.png" ToolTip="Edit" /> 
       <asp:ImageButton ID="gridDeleteButton" runat="server" CommandArgument="Delete" CommandName="Delete" ImageUrl="~/images/cancel.png" ToolTip="Delete" OnClientClick="return confirm('Are you sure you want to delete this record?');" /> 
      </ItemTemplate> 
      <EditItemTemplate> 
       <asp:ImageButton ID="gridUpdateButton" runat="server" CommandName="Update" ImageUrl="~/images/save.png" ToolTip="Update"/> 
       <asp:ImageButton ID="gridCancelButton" runat="server" CommandName="Cancel" ImageUrl="~/images/cancel.png" ToolTip="Cancel"/> 
      </EditItemTemplate> 
     </asp:TemplateField> 

     <asp:BoundField DataField="project_id" ItemStyle-CssClass="hiddencol" HeaderStyle-CssClass="hiddencol" /> 
     <asp:BoundField DataField="functional_sponsor" HeaderText="Functional Sponsor" SortExpression="functional_sponsor" /> 
     <asp:BoundField DataField="program_name" HeaderText="Program" SortExpression="program_name" /> 
     <asp:BoundField DataField="project_name" HeaderText="Project" SortExpression="project_name" /> 
     <asp:BoundField DataField="approval_status" HeaderText="Approval Status" SortExpression="approval_status" /> 
     <asp:BoundField DataField="approved_date" HeaderText="Approved Date" SortExpression="approved_date" /> 
     <asp:BoundField DataField="approved_by" HeaderText="Approved By" SortExpression="approved_by" /> 
     <asp:BoundField DataField="charge_code" HeaderText="Charge Code" SortExpression="charge_code" /> 
     <asp:BoundField DataField="open_date" HeaderText="Open Date" SortExpression="open_date" /> 
     <asp:BoundField DataField="close_date" HeaderText="Close Date" SortExpression="close_date" /> 
     <asp:BoundField DataField="project_sponsor" HeaderText="Sponsor" SortExpression="project_sponsor" /> 
     <asp:BoundField DataField="project_manager" HeaderText="Project Manager" SortExpression="project_manager" /> 
     <asp:BoundField DataField="technical_lead" HeaderText="Technical Lead" SortExpression="technical_lead" /> 
     <asp:BoundField DataField="approved_amount" HeaderText="Approved Amount ($K)" SortExpression="approved_amount" /> 
     <asp:BoundField DataField="requested_amount" HeaderText="Requested Amount ($K)" SortExpression="requested_amount" /> 
    </Columns> 
</asp:GridView> 
<asp:SqlDataSource ID="Project_List" runat="server" 
    ConnectionString="<%$ ConnectionStrings:ProjectDB %>" 
    SelectCommand="SELECT * FROM [vw_IT_Portfolio] ORDER BY [functional_sponsor], [program_name], [project_name]" 
    DeleteCommand="DELETE FROM [vw_IT_Portfolio] WHERE [project_id] = @project_id" 

    UpdateCommand="UPDATE [vw_IT_Portfolio] SET [functional_sponsor] = @functional_sponsor, [program_name] = @program_name, [project_name] = @project_name, [approval_status] = @approval_status, [approved_date] = @approved_date, [approved_by] = @approved_by, [charge_code] = @charge_code, [open_date] = @open_date, [close_date] = @close_date, [project_sponsor] = @project_sponsor, [project_manager] = @project_manager, [technical_lead] = @technical_lead, [approved_amount] = @approved_amount, [requested_amount] = @requested_amount WHERE [project_id] = @project_id"> 
    <DeleteParameters> 
     <asp:Parameter Name="project_id" Type="Int32" /> 
    </DeleteParameters> 
    <UpdateParameters> 
     <asp:Parameter Type="Int32" Name="project_id"></asp:Parameter> 
     <asp:Parameter Type="String" Name="functional_sponsor"></asp:Parameter> 
     <asp:Parameter Type="String" Name="program_name"></asp:Parameter> 
     <asp:Parameter Type="String" Name="project_name"></asp:Parameter> 
     <asp:Parameter Type="String" Name="approval_status"></asp:Parameter> 
     <asp:Parameter Type="String" Name="approved_date"></asp:Parameter> 
     <asp:Parameter Type="String" Name="approved_by"></asp:Parameter> 
     <asp:Parameter Type="String" Name="charge_code"></asp:Parameter> 
     <asp:Parameter Type="String" Name="open_date"></asp:Parameter> 
     <asp:Parameter Type="String" Name="close_date"></asp:Parameter> 
     <asp:Parameter Type="String" Name="project_sponsor"></asp:Parameter> 
     <asp:Parameter Type="String" Name="project_manager"></asp:Parameter> 
     <asp:Parameter Type="String" Name="technical_lead"></asp:Parameter> 
     <asp:Parameter Type="Decimal" Name="approved_amount"></asp:Parameter> 
     <asp:Parameter Name="requested_amount" Type="String" /> 
    </UpdateParameters> 
</asp:SqlDataSource>