Question

I have a class App which implements IApp interface class
this IApp interface is like this

    interface IApp
    {
        string Status;
        dateTime start;
        datetime end;
    }

now i want to convert List to List by using Linq
this I can do like this

//AppClassList is a List<App>
List<IApp> result = AppClassList.ConvertAll<IApp>(o => (IApp)o);

but I want to do custom code while converting App to IApp,
like I want to set Status property depend on start and end date diffrence , suppose difference is one day then Status will be “Excellent” if two day then “Good” if three day then “OK” and so on …

Please suggest me how i can do it while converting App to IApp using C#.net

Answer 1

List<IApp> result = AppClassList.ConvertAll<IApp>(o => ConvertToIApp(o));
    {
        IApp result = (IApp)o;
        TimeSpan span = result .end - result .start;
        if (span.TotalDays > 1)
        {
           result.Status = "Excellent";
        }
        return result;
    });

and having this method:

public IApp ConvertToIApp(Object element)
{
    IApp result = (IApp)element;
    TimeSpan span = result.end - result.start;
    if (span.TotalDays > 1)
    {
        result.Status = "Excellent";
    }
    return result;
}

you could write:

List<IApp> result = AppClassList.ConvertAll<IApp>(o => ConvertToIApp(o));

or

List<IApp> result = AppClassList.ConvertAll<IApp>(ConvertToIAppo);