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Datasource/Binding Issue

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This is a migrated thread and some comments may be shown as answers.

7 Answers, 1 is accepted

answered on 11 Jan 2011, 02:36 PM

Hi,

This is a general problem, so please elaborate further on your exact scenario. In the concrete case the problem is in the way the datasource is set.

Private Sub Summary_ItemDataBinding(....)

Me.DataSource = mSummaryData

End Sub

You had used the Definition item of the Report instead of the Processing one. The sender of the NeedDataSource event is always the processing counterpart of the data item and it is the receiver of the data source. The correct way is shown in the following code snippet:

Private Sub Summary_ItemDataBinding(....)

	DirectCast(sender, Telerik.Reporting.Processing.Report).DataSource= _

mSummaryData

End Sub

Check out the following help articles:
Report Life Cycle
Understanding Events

Generally speaking our suggestion is to use our declarative DataSource components (ObjectDataSource) that we have introduced in Q1 2010. They are optimized for performance and no coding is required.

Greetings,
Peter
the Telerik team

Get started with Telerik Reporting with numerous videos and detailed documentation.

answered on 18 Jan 2011, 06:34 AM

Hello Peter,
I am working on a asp.net application. I am trying to populate the report using the datasource. I am able to pass the values from 1 asp page to another only using Session or Cookies, when I try using the property it does not pass the value to other page or class file. The session or cookies work for only asp.net pages.
The “AlarmValues” is a class that contains “GetAlarmInformation” (same as example) this function is a list from which the values are passed to the report to populate. “EntityListDataSource” is the source of information this value populates when bound to data grid.

Aspx page:
AlarmValues alrmRpt = new AlarmValues();
alrmRpt.TestDBValue = EntityListDataSource;
alrmRpt.ProptotNumOfAlarms = totNumOfAlarms;

AlarmValue Class:
private UIEntityList DBValueToPop;

public UIEntityList TestDBValue
{
    get
    {
        return DBValueToPop;
    }
    set
    {
        if (value != null)
        {
            DBValueToPop = value;
            GetAlarmInformation();
        }
    }
}
The report populates the values with the uncommented lines which are static values if we see for the commented lines “DBValueToPop” contains values from where the values are to be populated. I had checked and it says that “DBValueToPop” does not contain any value since values are not passed through the property.

        public List<AlarmInfo> GetAlarmInformation()
        {
            List<AlarmInfo> AlarmValue = new List<AlarmInfo>();
            //foreach (InitiatedAlarmUIEntity entity in DBValueToPop)
            //{
                AlarmValue.Add(new AlarmInfo()
                {
                    //StartTime = Convert.ToString(entity.StartTime),
                    //StopTime = Convert.ToString(entity.StopTime),
                    //AlarmCount = Convert.ToString(entity.AlarmCount),

                    StartTime = Convert.ToString(1),
                    StopTime = Convert.ToString(AssigntotNumOfAlarms),
                    AlarmCount = Convert.ToString(3)
                });
            //}
            return AlarmValue;
        }

I am using object datasource. My doubt is that is the “AlarmValue” class gets created new when the report calls it and I need to supply values only as it calls since in the example the query and the connection is passed here.