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我希望能够在 ASPX 页面上的 OR 子句中使用 QueryString 参数和控制参数。

以下适用于 QueryString 参数

Select * From Data1

WHERE        ([Customer Name] = @C) 
AND ([Order Number] = @O) 
AND ('AD\' + Salesperson_AD_User_ID = @U)
AND ([Warehouse Id] = @W)
AND ([Use Description] is NOT NULL)


        <SelectParameters>
            <asp:querystringparameter QueryStringField="C" Name="C" />
            <asp:querystringparameter QueryStringField="O" Name="O" />
            <asp:querystringparameter QueryStringField="U" Name="U" />
            <asp:querystringparameter QueryStringField="W" Name="W" />
        </SelectParameters>

下面不起作用

select * From Data1

WHERE ([Customer Name] = @Customer_Name OR [Customer Name] = @C) 
AND ([Order Number] = @Order_Number OR [Order Number] = @O) 
AND ('AD\' + Salesperson_AD_User_ID = @username OR'AD\' + Salesperson_AD_User_ID = @U) 
AND ([Warehouse Id] = @Warehouse_Id OR [Warehouse Id] = @W) 
AND ([Use Description] IS NOT NULL)

全称是控制参数（文本框、下拉列表等）（@Customer_Name、@Order_Number、@username、@Warehouse_Id）

字母是查询字符串（@C、@O、@W、@U）

        <SelectParameters>
            <asp:controlparameter ControlID="DropDownListCustomer" PropertyName="SelectedValue" Name="Customer_Name" />
            <asp:querystringparameter QueryStringField="C" Name="C" />
            <asp:controlparameter ControlID="DropDownListContract" PropertyName="SelectedValue" Name="Order_Number" />
            <asp:querystringparameter QueryStringField="O" Name="O" />
            <asp:controlparameter ControlID="UserID" PropertyName="Text" Name="username" />
            <asp:querystringparameter QueryStringField="U" Name="U" />
            <asp:controlparameter ControlID="DropDownListLocation" PropertyName="SelectedValue" Name="Warehouse_Id" />
            <asp:querystringparameter QueryStringField="W" Name="W" />
        </SelectParameters>

如果未提供 QueryString 或 QueryString 包含值使用它，如何将 OR 子句添加到控件的默认值？

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