Binding ObjectDataSource Component to a DataAdapter
The following example illustrates how to use a DataAdapter as the source for an ObjectDataSource component. The example demonstrates also how to configure the report to use the ObjectDataSource and how to preview it in the Windows Forms Report Viewer with code.
The ObjectDataSource component may be configured in the Telerik Report Designers without the need for writing additional code. It may be necessary to extend the Reporting engine to recognize the custom assembly with the data providing logic through the assemblyReferences Element in the Telerik.Reporting section of the designer's configuration file.
The ObjectDataSource component allows you to use directly a class that implements the System.Data.IDataAdapter interface. In the sample code below an instance of the SqlDataAdapter class is created and passed to the DataSource property of the ObjectDataSource component. When the DataAdapter encounters multiple result sets, it creates multiple tables and each table is given an incremental default name of TableN, starting with "Table" for Table0. In this case you have to set the DataMember property of the ObjectDataSource component to indicate exactly which table to bind to. Additionally a sample calculated field is added that can be used in the report definition in the same way as a regular field.
void Form4_Load(object sender, EventArgs e)
{
// Creating and configuring the ObjectDataSource component:
var objectDataSource = new Telerik.Reporting.ObjectDataSource();
objectDataSource.DataSource = GetMyData(); // GetData returns a SqlDataAdapter object which has a select command with three SELECT statements.
objectDataSource.DataMember = "Table2"; /// Indicating the exact table to bind to. If the DataMember is not specified the first data table will be used.
objectDataSource.CalculatedFields.Add(new Telerik.Reporting.CalculatedField("FullName", typeof(string), "=Fields.Name + ' ' + Fields.ProductNumber")); // Adding a sample calculated field.
// Creating a new report
var report = new Report1();
// Assigning the ObjectDataSource component to the DataSource property of the report.
report.DataSource = objectDataSource;
// Use the InstanceReportSource to pass the report to the viewer for displaying
var reportSource = new Telerik.Reporting.InstanceReportSource();
reportSource.ReportDocument = report;
// Assigning the report to the report viewer.
reportViewer1.ReportSource = reportSource;
// Calling the RefreshReport method in case this is a WinForms application.
reportViewer1.RefreshReport();
}
static IDataAdapter GetMyData()
{
const string connectionString =
"Data Source=(local)\\SQLEXPRESS;Initial Catalog=AdventureWorks;Integrated Security=True";
string selectCommandText = "SELECT Name, ProductCategoryID FROM Production.ProductCategory;" +
"SELECT Name, ProductCategoryID FROM Production.ProductSubcategory;" +
"SELECT Name, ProductNumber FROM Production.Product;";
return new SqlDataAdapter(selectCommandText, connectionString);
}
Private Sub Form4_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
' Creating and configuring the ObjectDataSource component:
Dim objectDataSource As New Telerik.Reporting.ObjectDataSource()
objectDataSource.DataSource = GetMyData() ' GetData returns a SqlDataAdapter object which has a select command with three SELECT statements.
objectDataSource.DataMember = "Table2" ' Indicating the exact table to bind to. If the DataMember is not specified the first data table will be used.
objectDataSource.CalculatedFields.Add(New Telerik.Reporting.CalculatedField("FullName", GetType(String), "=Fields.Name + ' ' + Fields.ProductNumber")) ' Adding a sample calculated field.
'Creating a new report
Dim report As New Report1()
' Assigning the ObjectDataSource component to the DataSource property of the report.
report.DataSource = objectDataSource
' Use the InstanceReportSource to pass the report to the viewer for displaying.
Dim reportSource As New InstanceReportSource
reportSource.ReportDocument = report
' Assigning the report to the report viewer.
reportViewer1.ReportSource = reportSource
' Calling the RefreshReport method in case this is a WinForms application.
Me.reportViewer1.RefreshReport()
End Sub
Shared Function GetMyData() As IDataAdapter
Const connectionString As String =
"Data Source=(local)\SQLEXPRESS;Initial Catalog=AdventureWorks;Integrated Security=True"
Dim selectCommandText As String =
"SELECT Name, ProductCategoryID FROM Production.ProductCategory;" _
+ "SELECT Name, ProductCategoryID FROM Production.ProductSubcategory;" _
+ "SELECT Name, ProductNumber FROM Production.Product;"
Return New SqlDataAdapter(selectCommandText, connectionString)
End Function
To use this code in the Report Designer Tools, the data retrival methods must be built in separate assembly and specifically configured before it can be resolved by the Report Designers - Connecting the ObjectDataSource component to a Data Source