This sample project demonstrates how to connect to data from the code. First of all, use ShowWithWpf() method to show the report:
private void ShowReport(DataSet dataSet)
{
	var report = new StiReport();
	report.Load(@"Reports\TwoSimpleLists.mrt");
	report.Dictionary.Databases.Clear();
	report.RegData("Demo", dataSet);
	report.ShowWithWpf();
}

...

Then, connect to data:
...

private void ButtonXML_Click(object sender, RoutedEventArgs e)
{
	var dataSet = new DataSet();
	dataSet.ReadXmlSchema(@"Data\Demo.xsd");
	dataSet.ReadXml(@"Data\Demo.xml");

	ShowReport(dataSet);
}

private void ButtonJSON_Click(object sender, RoutedEventArgs e)
{
	var dataSet = StiJsonToDataSetConverterV2.GetDataSetFromFile(@"Data\Demo.json");

	ShowReport(dataSet);
}

На скриншоте ниже Вы можете увидеть результат выполнения данного кода:

Connecting to Data from Code

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