output parameters with the objectdatasource

trancehead · July 5th, 2006, 09:07 AM

Hi,

I have an objectdatasource with a selectmethod. that method then calls a stored procedure and creates a datatable that gets sent back to the objectdatasource. My problem is that even though I have a output paramater on the objectdatasource it doesn't receive a value.

Here is the code, any healp is appreciated.

Stored Proc

Code:

ALTER PROCEDURE [dbo].[GetPagedWines]
    @PageIndex INT, 
    @NumRows INT,
    @TotalCount INT OUTPUT
AS

BEGIN 
 
SELECT @TotalCount = 150 /*(SELECT COUNT(*) FROM Wine AS TotalCount)*/

DECLARE @StartRowIndex INT;
SET @StartRowIndex = (@PageIndex * @NumRows) + 1;

WITH ListEntries AS ( 
SELECT ROW_NUMBER() OVER (ORDER BY WineID_PK ASC)AS Row, * FROM Wine)

SELECT *, @TotalCount AS TotalCount
FROM ListEntries 
WHERE Row between @StartRowIndex and @StartRowIndex+@NumRows

RETURN
END

objectdatasource

Code:

<asp:ObjectDataSource ID="odsWineList" runat="server" TypeName="BLL.WineFunctions.WinesBLL" SelectMethod="GetPagedWinesBLL">
    <SelectParameters>
        <asp:Parameter Name="PageIndex" DefaultValue="0" />
        <asp:Parameter Name="numRows" DefaultValue="10" />
        <asp:Parameter Name="TotalCount" Direction="Output" DefaultValue="0"/>
</SelectParameters>
</asp:ObjectDataSource>

Code:

 Public Function GetPagedWinesBLL(ByVal numRows As Integer, ByVal PageIndex As Integer, ByVal TotalCount As Integer) As Wines.WinesDataTable
            Return Adapter.GetAllWinesPaged(PageIndex, (numRows - 1), TotalCount)
         End Function

atifahmedsiddiqui · May 18th, 2007, 01:19 AM

yes.. i do have the same problem... but i m using c#,
so my function is..

public DataTable GetPages(int startRowIndex, int maximumRows, out int? TotalRecords)
{
return Adapter.GetPages(startRowIndex, maximumRows, out TotalRecords)
}

plz help us Gurus :)

surge001 · August 25th, 2008, 12:41 PM

Team:
this should clear the air for you:

- ASPX -
<asp:GridView ID="grvSearchResults" runat="server">
</asp:GridView>
<asp:ObjectDataSource ID="obdsSearchResults" SelectMethod="SearchLegalEntity"
    SelectCountMethod="SearchLegalEntityCount"
    runat="server"
    TypeName="LEMS.Helper.LESearch">
</asp:ObjectDataSource>

- Code Behind -

public void GetSearchResults()
    {
        ControlParameter param = new ControlParameter("searchCriteria", TypeCode.Object, this.ID, "SearchCriteria");
        obdsSearchResults.SelectParameters.Add(param);
        Parameter parOut = new Parameter("statusCodeList", TypeCode.Object);
        parOut.Direction = ParameterDirection.Output;
        obdsSearchResults.SelectParameters.Add(parOut);
        grvSearchResults.DataSource = obdsSearchResults;
        obdsSearchResults.Selected +=new ObjectDataSourceStatusEventHandler(obdsSearchResul ts_Selected);
        grvSearchResults.DataBind();
    }
    protected void obdsSearchResults_Selected(object sender, ObjectDataSourceStatusEventArgs e)
    {
        if (e.OutputParameters["statusCodeList"] == null)
            return;
        StatusCodeList = (IList<LEMS.Common.Proxy.WBStatus>)e.OutputParamet ers["statusCodeList"];
    }

So in other words the idea is to add a new event handler which would run right after the data is fetched and before the DataBind() method has finished running and extract your output parameter values from the ObjectDataSourceStatusEventArgs object which conveniently has OutputParameters property. Feel free to typecast the object to whichever custom class you want as shown above. StatusCodeList in code above is a public property of the same type as the typecast. The DridView definition in ASPX code does not use DataSourceID property because I want to control when and how I envoke DataBind, which as you can see is taken care of in my custom method on the code behind.

Enjoy! If it doesn't help, let me know. See, sometimes it does pay off asking Gurus for help! :)
:)