datasource and state server

[Ibrahim Imam]

hello


i am getting an error in my report-viewer page because the objects used for datasource use IList which does not implement ISerializable.

Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.

i am using state server for sessionStates

how can i use state server and a hierarchy of entities as datasource?

regards

[Steve]

Hello Ibrahim,

We have a business objects example using List (available here) and you can try using List instead of IList for your scenario.
You can also use the NeedDataSource event of the report and thus assign the datasource to the "processing report", thus avoiding any need for serialization/deserialization.
Another approach is to move on to DataSet or DataTable:

DataTable dt = new DataTable();
            DataColumn col = new DataColumn("ColumnName", typeof(string));
            ....
            dt.Columns.Add(col);
            foreach (object Item in MyIList)
            {
                DataRow row = dt.NewRow();
                row["ColumnName"] = Item;
                .....
                dt.Rows.Add(row);
            }

Best wishes,
Steve
the Telerik team

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[Ibrahim Imam]

replacing IList with List completly solved my problem

thanks

[Shawn Krivjansky]

What EXACTLY does this statement mean?? :
"You can also use the NeedDataSource event of the report and thus assign the datasource to the "processing report", thus avoiding any need for serialization/deserialization."

I am using the latest version of Telerik Reporting and using "StateServer" for session state.

I have something like this:

Partial Public Class myReport4
    Inherits Telerik.Reporting.Report

    Public Sub New()
        InitializeComponent()
        'Me.LoadData()
    End Sub

    Private Sub myReport4_NeedDataSource(sender As Object, e As System.EventArgs) Handles Me.NeedDataSource
        Me.LoadData()
    End Sub
    Private Sub LoadData()

        Dim dbContextMaster As New HRnetMasterDataModel()
        Dim ds = dbContextMaster.TenantMasters.ToList

        Me.DataSource = ds

    End Sub

It would appear to me that I AM implementing the "NeedDataSource", but yet at runtime (in a web app report viewer control) I get the "unable to serialize the session state" error message.  So, what do I need to do to get this to work? Or, am I not understanding the instructions??

[Shawn Krivjansky]

Nevermind.

I think I get it now.

"Processing Report" is a class and DIFFERENT than the normal "report" (this,me).

I was assigning to the datasouce of ME and not to Processing.Report.Datasource.

That cleared it up for me.