将无效的 QueryStringParameter 重定向到 LinqDataSource

发布于 2024-11-16 08:47:22 字数 883 浏览 3 评论 0原文

我有以下 LinqDataSource：

<asp:LinqDataSource ID = "agreementDs"
                    ContextTypeName = "AdministrationDataContext"
                    TableName = "Agreements"
                    runat = "server"
                    EnableUpdate = "true"                        
                    Where = "AgreementId=@AgreementId">

    <WhereParameters>
        <asp:QueryStringParameter QueryStringField = "AgreementId" 
                                  Name = "AgreementId"
                                  Type = "Int32"
                                  DefaultValue = "-1" />
    </WhereParameters>                        
</asp:LinqDataSource>

它应该从协议数据库表中获取一行。如何检测参数AgreementId是否为-1，如果是，则提供404页面或将用户重定向到我的网站的首页？我无法弄清楚在代码隐藏中插入此逻辑的正确位置是什么。

更新：不仅仅是当AgreementId 参数为-1 时才应重定向用户。当数据源不包含任何行时，它应该总是发生。

原文

I have the following LinqDataSource:

<asp:LinqDataSource ID = "agreementDs"
                    ContextTypeName = "AdministrationDataContext"
                    TableName = "Agreements"
                    runat = "server"
                    EnableUpdate = "true"                        
                    Where = "AgreementId=@AgreementId">

    <WhereParameters>
        <asp:QueryStringParameter QueryStringField = "AgreementId" 
                                  Name = "AgreementId"
                                  Type = "Int32"
                                  DefaultValue = "-1" />
    </WhereParameters>                        
</asp:LinqDataSource>

It is supposed to fetch one row from the agreements database table. How can I detect if the parameter AgreementId is -1 and if so either serve up a 404 page or redirect the user to the front page of my site? I cant figure out what the correct place is to insert this logic in the code-behind.

Update: It is not only when the AgreementId parameter is -1 that the user should be redirected. It should always happen when the data source does not contain any rows.

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怀里藏娇 2024-11-23 08:47:22

将“OnSelecting”方法名称添加到 LINQ 数据源，然后从该方法中检查您需要的任何内容：

<asp:LinqDataSource runat="server" OnSelecting="ldsSelecting" .... />

protected void ldsSelecting(object o, LinqDataSourceSelectEventArgs e)
{
     // check for query string or other stuff here, redirect if needed
}

Add an "OnSelecting" method name to your LINQ Data Source, then from that method, check for whatever you need:

<asp:LinqDataSource runat="server" OnSelecting="ldsSelecting" .... />

protected void ldsSelecting(object o, LinqDataSourceSelectEventArgs e)
{
     // check for query string or other stuff here, redirect if needed
}

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