I believe if you change your List<ReportA> (inside of GetReports()) to
type List<Report> it might work...
Brandon
Ron Young wrote:
Is the following possible? The compiler tells me no:
class Report
{
}
class ReportA : Report
{
public string MyName = "ReportA";
}
class ReportProvider
{
public List<Report> GetReports()
{
List<ReportA> reports = new List<ReportA>();
reports.Add(new Report());
return reports;
}
}
I'd like to have that single method in ReportProvider, and hopefully a
jumptable to return different types of reports:
class ReportProvider
{
Dictionary<Type, Func<Criteria, List<Report>>> _mappings = new ...
public ReportProvider()
{
_mappings.Add(typeof(BillableHoursReport,
GetBillableHoursReport));
_mappings.Add(typeof(DetailByDateReport, GetDetailByDateReport));
}
public IList<T> GetReport<T>(Criteria criteria) where T: Report
{
Type t = typeof(T);
return _mappings[t].Invoke(criteria);
}
private IList<DetailByDateReport> GetDetailByDateReport(Criteria
criteria)
{
List<DetailByDateReport> results = new ...
// do stuff
return results;
}
// other get report methods that return derived Report types
}
Thanks
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