ASP.net GridView and Object DataSource
-
12-09-2019 - |
Question
How can I configure a ASP.NET GridView to populate it by an Object DataSource where the object method needs a noticeCode to pass by the C# code?
StudentControlPanel.aspx.cs
protected void Page_Load(object sender, EventArgs e)
{
string username = (string)Request.QueryString["username"];
Student std = Student.GetStudentByUsername(username);
if (std != null)
{
labName.Text = std.StudentName;
labUsername.Text = username;
labRollNo.Text = std.RollNo;
labRegNo.Text = std.RegNo;
Dept dpt = std.Department;
if (dpt != null)
{
labDepartment.Text = dpt.DeptName;
}
else
{
labDepartment.Text = "?";
}
}
/* Student-class has a SessionCode-property */
/* I need to pass this to Notice.GetNoticesBySessionCode()...*/
}
Notice.cs
public class Notice
{
public static List<Notice> GetNoticesBySessionCode(string sessionCode)
{
List<Notice> notices = null;
/* EcecuteReader()..... */
return notices;
}
}
Solution
You will have to bind the value of std.SessionCode
to the ObjectDataSource in code-behind. In the "Configure Data Source" screen above, choose None for now. You'll be binding it dynamically.
If your ObjectDataSource looks like this:
<asp:ObjectDataSource ID="myObjDS" runat="server"
TypeName="YourNamespace.Notice"
SelectMethod="GetNoticesBySessionCode">
<SelectParameters>
<asp:Parameter Name="sessionCode" Type="String"/>
</SelectParameters>
</asp:ObjectDataSource>
Then
if (std != null)
{
//all the other code you have above.
myObjDS.SelectParameters["sessionCode"].DefaultValue = std.SessionCode;
myObjDS.DataBind(); //ensure you actually need this, may cause a double roundtrip to your DB.
}
OTHER TIPS
The above answer has it pretty much well covered. Just to add, you can also add parameters in the onselecting event of the objectdatasource.
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.objectdatasource.selecting.aspx
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