[英]Writing a SQLdatasource in code behind in C# to use a code behind value
I am trying to populate a data table using the SQL datasource based upon parametrized inputs .The tricky thing is that the value of the parametrized input is available only in the code behind so I am forced to write the SQL datasource in the code behind page 我正在尝试使用基于参数化输入的SQL数据源填充数据表。棘手的事情是,参数化输入的值仅在后面的代码中可用,因此我被迫在页面后面的代码中编写SQL数据源
How do I go about it ( I am using C# and ASP.Net 4.0) 我该怎么做(我正在使用C#和ASP.Net 4.0)
The current code in the asp.net page to create the sql datasource connection is : asp.net页中用于创建sql数据源连接的当前代码为:
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:LicensingConnectionString %>"
SelectCommand="SELECT * FROM [commissions] where username=@username "></asp:SqlDataSource>
The value I want to use in @username is retrieved in the code behind by this code 我要在@username中使用的值在此代码后面的代码中检索
IPrincipal p = HttpContext.Current.User;
// p.Identity.Name : this is what we will use to call the stored procedure to get the data and populate it
string username = p.Identity.Name;
Thanks ! 谢谢 !
You need to handle the OnSelecting event of the data source, and in there you can set the parameter's value. 您需要处理数据源的OnSelecting事件,并可以在其中设置参数的值。
In your page: 在您的页面中:
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:LicensingConnectionString %>"
SelectCommand="SELECT * FROM [commissions] where username=@username"
OnSelecting="SqlDataSource1_Selecting" >
<SelectParameters>
<asp:Parameter Name="username" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
In your codebehind: 在您的代码背后:
protected void SqlDataSource1_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{
e.Command.Parameters["@username"].Value = HttpContext.Current.User.Identity.Name;
}
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