Report Book Parameters Overview

Often one or more reports that are part of a report book will contain report parameters. The report book is shown as a single document in the report viewer and the parameters area represents the visible report parameters defined in all child reports.

Telerik Reporting provides a mechanism known as parameter merging. If the Name and Type of two (or more) parameters from different reports are the same, then they are considered equivalent and are displayed as a single parameter in the viewer's Parameters Area.

When one or more parameters are merged the UI settings of the first one are used for the generated input control in the parameters area.

You can control parameter merging via the Mergeable boolean property of the ReportParameter class. The default value of the Mergeable property is true. Set the Mergeable property to false if you want to prevent a parameter from being merged with its equivalent ones.

Passing Values for Report Parameters in a Reportbook through ReportSource

• When report parameters have unique names or the target parameters are merged: If a parameter is distinguishable by its Name property or the Name denotes several merged parameters, refer to the parameter directly by the value of its Name property.

var typeReportSource = new Telerik.Reporting.TypeReportSource();
typeReportSource.TypeName = typeof(MyReportBook).AssemblyQualifiedName;

// Passing a value for unique or repeating report parameter that should have one and the same value
// for all reports part of the report book thru the report source
typeReportSource.Parameters.Add(new Telerik.Reporting.Parameter("ProductCategory", "Bikes"));

Dim typeReportSource As New Telerik.Reporting.TypeReportSource()
typeReportSource.TypeName = GetType(MyReportBook).AssemblyQualifiedName

' Passing a value for unique Or repeating report parameter that should have one And the same value
' for all reports part of the report book thru the report source
typeReportSource.Parameters.Add(New Telerik.Reporting.Parameter("ProductCategory", "Bikes"))

• When report parameters have repeating names but they are not merged: In this case you need to refer to the individual occurrence of the parameter in a particular report. This is done by denoting the target report by its zero-based index inside the report book.

var typeReportSource = new Telerik.Reporting.TypeReportSource();
typeReportSource.TypeName = typeof(MyReportBook).AssemblyQualifiedName;

// Passing a value for not mergeable report parameter targeting the FIRST report in the report book
// thru the report source
typeReportSource.Parameters.Add(new Telerik.Reporting.Parameter("reports(0).ClientID", 102));

// Passing a value for not mergeable report parameter targeting the SECOND report in the report book
// thru the report source
typeReportSource.Parameters.Add(new Telerik.Reporting.Parameter("reports(1).ClientID", 103));

Dim typeReportSource As New Telerik.Reporting.TypeReportSource()
typeReportSource.TypeName = GetType(MyReportBook).AssemblyQualifiedName

' Passing a value for Not mergeable report parameter targeting the FIRST report in the report book
' thru the report source
typeReportSource.Parameters.Add(New Telerik.Reporting.Parameter("reports(0).ClientID", 102))

' Passing a value for Not mergeable report parameter targeting the SECOND report in the report book
' thru the report source
typeReportSource.Parameters.Add(New Telerik.Reporting.Parameter("reports(1).ClientID", 103))

If you do not use the specified syntax and you refer to the report parameter directly by the Name property's value, the value will be set only for the first occurrence of report parameter in the report book.