Question

我有一个名为UserProfile.aspx的网络表单。用户登录后，他们可以在UserProfile上查看和编辑他们的详细信息。我使用SqlDataSource并将数据绑定到DetailsView。在详细信息视图中，它从3个表中检索数据，选择查询工作正常，可以成功显示数据。

但是，当我更新信息并点击Update中的DetailsView按钮时，会出现此错误：

异常详细信息：System.Data.SqlClient.SqlException：
必须声明标量变量“@UserId”。

以下是我获取当前登录用户的代码（在UserProfile.aspx内）：

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
      ConnectionString="<%$ ConnectionStrings:ASPNETDBConnectionString1 %>" 

  SelectCommand="SELECT aspnet_Membership.Email, Details.CustName, Details.CustNum, Details.CustRole, Details.CustStatus, Details.PName, Details.PEmail, Details.PRole, Details.WedDate, aspnet_Users.UserName FROM Details INNER JOIN aspnet_Membership ON Details.UserId = aspnet_Membership.UserId INNER JOIN aspnet_Users ON aspnet_Membership.UserId = aspnet_Users.UserId WHERE Details.UserId = @UserId" 
        onselecting="SqlDataSource1_Selecting" 

  UpdateCommand="UPDATE Details SET CustName = @CustName, CustNum = @CustNum, CustRole = @CustRole, CustStatus = @CustStatus, PName = @PName, PEmail = @PEmail, PRole = @PRole, WedDate = @WedDate WHERE [UserId] = @UserId">

        <SelectParameters>
            <asp:Parameter Name="UserId" type="String" />
        </SelectParameters>

修改

        <UpdateParameters>
            <asp:Parameter Name="UserId" type="String" />
            <asp:Parameter Name="CustName" type="String"  />
            <asp:Parameter Name="CustNum" type="String" />
            <asp:Parameter Name="CustRole" type="String" />
            <asp:Parameter Name="CustStatus" type="String" />
            <asp:Parameter Name="PName" type="String" />
            <asp:Parameter Name="PEmail" type="String"  />
            <asp:Parameter Name="PRole" type="String"  />
            <asp:Parameter Name="WedDate" type="String" />
        </UpdateParameters>
    </asp:SqlDataSource>

    <br />
    <asp:DetailsView ID="DetailsView1" runat="server" 
        AutoGenerateRows="False" 
        DataSourceID="SqlDataSource1" 
        Height="29px" 
        Width="476px">

        <Fields>
            <asp:BoundField DataField="UserName" HeaderText="UserName" 
                SortExpression="UserName" ReadOnly="True" />

            <asp:BoundField DataField="Email" HeaderText="Email" 
                SortExpression="Email" />

            <asp:BoundField DataField="CustName" HeaderText="CustName" 
                SortExpression="CustName" />

            <asp:BoundField DataField="CustNum" HeaderText="CustNum" 
                SortExpression="CustNum" />    

            <asp:BoundField DataField="CustRole" HeaderText="CustRole" 
                SortExpression="CustRole" />
            <asp:BoundField DataField="CustStatus" HeaderText="CustStatus" 
                SortExpression="CustStatus" />
            <asp:BoundField DataField="PName" HeaderText="PName" 
                SortExpression="PName" />
            <asp:BoundField DataField="PEmail" HeaderText="PEmail" 
                SortExpression="PEmail" />
            <asp:BoundField DataField="PRole" HeaderText="PRole" 
                SortExpression="PRole" />
            <asp:BoundField DataField="WedDate" HeaderText="WedDate" 
                SortExpression="WedDate" />
            <asp:CommandField ShowEditButton="True" />

        </Fields>
        <PagerTemplate>
            <br />
        </PagerTemplate>
    </asp:DetailsView>

这是UserProfile.aspx.cs文件：

protected void SqlDataSource1_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{
    // Get a reference to the currently logged on user
    MembershipUser currentUser = Membership.GetUser();

    // Determine the currently logged on user's UserId value
    // Assign the currently logged on user's UserId to the @UserId parameter
    //access the parameter value using e.Command.Parameters 
    //programmatically set the @UserId:

    e.Command.Parameters["@UserId"].Value = currentUser.ProviderUserKey.ToString();

    Response.Write(currentUser.ProviderUserKey.ToString()); 
    //When I run the webform, the UserId of the current logged-in user had displayed, 
    // the @UserId was not empty. 
}

我在想，更新查询可能无法检测到@UserId。但由于@UserId适用于SELECT查询，为什么在UPDATE中，它不是？

Answer 1

您需要在Update参数中指定UserId作为参数，并且Select和Update是两个独立的命令。 UserId用于Update WHERE子句，因此需要提供。

    <UpdateParameters>
        <asp:Parameter Name="UserId" type="String" />
        <asp:Parameter Name="CustName" type="String"  />
        <asp:Parameter Name="CustNum" type="String" />
        <asp:Parameter Name="CustRole" type="String" />
        <asp:Parameter Name="CustStatus" type="String" />
        <asp:Parameter Name="PName" type="String" />
        <asp:Parameter Name="PEmail" type="String"  />
        <asp:Parameter Name="PRole" type="String"  />
        <asp:Parameter Name="WedDate" type="String" />
    </UpdateParameters>

Answer 2

您需要在UpdateParameters和SelectParameters中声明UserId，如：

<asp:Parameter Name="UserId" type="String" />

必须在Update Statement中声明标量变量“@UserId”

2 个答案: