Progress® Telerik® Reporting R3 2021

Report.NeedDataSource Event

Occurs when the processing of the report processing instance (i.e., Report instance) begins and this instance has no DataSource property set.

Namespace:  Telerik.Reporting
Assembly:  Telerik.Reporting (in Telerik.Reporting.dll)

Syntax

C#

VB

Copy

public event EventHandler NeedDataSource

Public Event NeedDataSource As EventHandler

Value

Type: SystemEventHandler

Remarks

The event is hooked on the definition Report instance, but the sender object in the event handler is the processing Report instance. The processing instance of the report inherits its DataSource from the definition instance, but if neither has DataSource set, this event is raised.

Examples

The following example demonstrates how to implement a NeedDataSource event handler:

C#

VB

Copy

void report_NeedDataSource(object sender, EventArgs e)
{
    Telerik.Reporting.Processing.Report processingReport = (Telerik.Reporting.Processing.Report)sender;
    object processingParameterValue = processingReport.Parameters["parameter1"].Value;
    processingReport.DataSource = GetData(processingParameterValue);
}

static object GetData(object value)
{
    // Implement your custom data retrieval logic instead
    return new string[] { "Sofia", "London", "Tokyo" };
}

Private Sub report_NeedDataSource(sender As Object, e As EventArgs)
    Dim processingReport As Telerik.Reporting.Processing.Report = DirectCast(sender, Telerik.Reporting.Processing.Report)
    Dim processingParameterValue As Object = processingReport.Parameters("parameter1").Value
    processingReport.DataSource = GetData(processingParameterValue)
End Sub

Private Shared Function GetData(value As Object) As Object
    ' Implement your custom data retrieval logic instead
    Return New String() {"Sofia", "London", "Tokyo"}
End Function

Version Information

Supported in: 1.0.1

See Also

Reference

Report Class

Telerik.Reporting Namespace