真實世界的外觀（C）

public class MyDataExporterToExcell
{
    public static void Main()
    {
        GetAndExportExcelFacade facade = new GetAndExportExcelFacade();

        facade.Execute();
    }
}

public class GetAndExportExcelFacade
{

    // All services below do something by themselves, determine location for data,
    // get the data, format the data, and export the data
    private readonly DetermineExportDatabaseService _determineExportData = new DetermineExportDatabaseService();
    private readonly GetRawDataToExportFromDbService _getRawData = new GetRawDataToExportFromDbService();
    private readonly TransformRawDataForExcelService _transformData = new TransformRawDataForExcelService();
    private readonly CreateExcelExportService _createExcel = new CreateExcelExportService();

    // the facade puts all the individual pieces together, as its single responsibility.
    public void Execute()
    {
        var dataLocationForExport = _determineExportData.GetDataLocation();
        var rawData = _getRawData.GetDataFromDb(dataLocationForExport);
        var transformedData = _transformData.TransformRawToExportableObject(rawData);
        _createExcel.GenerateExcel("myFilename.xlsx");
    }
}