如何解决删除后必须声明标量变量
我有一个名为“shipments”的数据库表，我有连接到这个名为“sqldatasource”的表的sqldatasource和连接到这个sqldatasource的gridview。 这是sqldatasource代码：
<asp:sqlDataSource ID="sqlDataSource1" runat="server" ConnectionString="connection" ProviderName="System.Data.sqlClient" SelectCommand="SELECT shipments.Id,shipments.exitTime AS [exit Time],shipments.arriveTime AS [arrive Time],citys.name AS [exit city name],shipments.exitAddress AS [exit address],citys_2.name AS [destination city],shipments.destAddress AS [destination address],shipments.weight,users.username AS [sender username],users.phoneNumber AS [sender phone number],receivers.name AS [receiver name],receivers.phoneNumber AS [receiver phone number],status.name AS status FROM receivers RIGHT OUTER JOIN shipments ON receivers.Id = shipments.reciever LEFT OUTER JOIN status ON shipments.status = status.Id LEFT OUTER JOIN citys AS citys_2 ON shipments.destCityID = citys_2.Id LEFT OUTER JOIN users ON shipments.sender = users.Id LEFT OUTER JOIN citys ON shipments.exitCityID = citys.Id" DeleteCommand="DELETE FROM shipments WHERE (shipments.Id = @Id)">
<DeleteParameters>
<asp:Parameter Name="Id" />
</DeleteParameters>
</asp:sqlDataSource>
当我运行代码时，它会显示删除按钮，但是当我按下它时，它会将我重定向到一个页面，上面写着：“必须声明标量变量“@Id”。 为什么它不起作用？
（select 推荐有很多'inner Joins'，是否相关？）
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