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Using Parameters with the ObjectDataSource Component

The ObjectDataSource component can call a business object method based on the name of the method specified in the DataMember property, and based additionally on the argument names that make up the business object method's signature. When you create methods in a business object, you must ensure that the parameter names and types accepted by the business object method match the parameter names and types that the ObjectDataSource component passes.

The ObjectDataSource component accepts input parameters at run time and manages them in a parameter collection. You can use the Parameters property to specify the parameters. For each parameter you can set a name and a default value or an expression. During the report processing the ObjectDataSource parameters’ values are used as argument values for the data method or the constructor of the business object. Because of this the order of the parameters is important and should exactly match the order of the arguments along with their types and names. Any discrepancy will result in a run-time exception.

The ObjectDataSource Wizard can detect parameters of the data-retrieval method, and it will ask you to provide values for them at Configure Data Source Parameters step.

Here is an example of programmatically setting the ObjectDataSource’s parameters:

public void HowToObjectDataSourceParameters()
    Telerik.Reporting.ObjectDataSource objectDataSource1 = new Telerik.Reporting.ObjectDataSource();
    objectDataSource1.DataMember = "GetCars";
    objectDataSource1.DataSource = typeof(Cars);
    objectDataSource1.Parameters.Add(new Telerik.Reporting.ObjectDataSourceParameter("year", typeof(int), 2010));
    objectDataSource1.Parameters.Add(new Telerik.Reporting.ObjectDataSourceParameter("color", typeof(string), "=Parameters.Color"));
Public Sub HowToObjectDataSourceParameters()
    Dim objectDataSource1 As New Telerik.Reporting.ObjectDataSource()
    objectDataSource1.DataMember = "GetCars"
    objectDataSource1.DataSource = GetType(Cars)
    objectDataSource1.Parameters.Add(New Telerik.Reporting.ObjectDataSourceParameter("year", GetType(Integer), 2010))
    objectDataSource1.Parameters.Add(New Telerik.Reporting.ObjectDataSourceParameter("color", GetType(String), "=Parameters.Color"))
End Sub

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