Question

我正在使用SqlDataSource根据登录用户显示记录

<asp:SqlDataSource ID="ModifyCustomerDataSource" SelectCommand="SELECT cApplicationNo,cFirstName,cMiddleName,cLastName,nTelNo,nMobileNo,cPanGirNo from Data_Customer_Log where cAddedBy=@LoggedInUser" ConnectionString="<%$ ConnectionStrings:CwizDataConnectionString %>"   runat="server"></asp:SqlDataSource>

在页面加载中我添加了如下参数

protected void Page_Load(object sender, EventArgs e)
        {
            string user = HttpContext.Current.User.Identity.Name;
            ModifyCustomerDataSource.SelectParameters.Clear();
            ModifyCustomerDataSource.SelectParameters.Add("@LoggedInUser", user.Trim());
        }

但它给了我错误

Must declare the scalar variable "@LoggedInUser".
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Data.SqlClient.SqlException: Must declare the scalar variable "@LoggedInUser".

有人能指出我出错的地方吗？感谢

Answer 1

添加参数时不需要@，例如：

ModifyCustomerDataSource.SelectParameters.Add("LoggedInUser", user.Trim());

查询中的@符号表示以下文本是参数的名称，但@不被视为参数名称的一部分。

Answer 2

<asp:SqlDataSource ID="ModifyCustomerDataSource" SelectCommand="SELECT cApplicationNo,cFirstName,cMiddleName,cLastName,nTelNo,nMobileNo,cPanGirNo from Data_Customer_Log where cAddedBy=@LoggedInUser" ConnectionString="<%$ ConnectionStrings:CwizDataConnectionString %>"   runat="server">

        <SelectParameters>

            <asp:Parameter Name="LoggedInUser" />

        </SelectParameters>

</asp:SqlDataSource>

验证您在Sqldatasource中定义的SelectParameter是上面提到的示例。

您可以通过两种方式设置参数值：

ModifyCustomerDataSource.SelectParameters["LoggedInUser"].DefaultValue = "some value";

or

ModifyCustomerDataSource.SelectParameters.Add("@LoggedInUser", user.Trim()); //@is must here with the parameter name

必须声明标量变量“@LoggedInUser”。尝试将参数添加到SqlDataSource时出错

2 个答案: