Question

I am editing my code that used to be just

     return phases
            .OfType<ServicePhase>()
            .Where(p => p.Service.Code == par.Service.Code)
            .Cast<ParPhase>()

however now i want it to include both

 return phases
                .OfType<ServicePhase>()
                .Where(p => p.Service.Code == par.Service.Code)
                .Cast<ParPhase>()

             .OfType<ParTypePhase>()
            .Where(p => p.ParType.Code == par.Type.Code)
            .Cast<ParPhase>();

How can i merge both of these together

Answer 1

Use Concat or Union method.

Sample:

var result = 
    phases
        .OfType<ServicePhase>()
        .Where(p => p.Service.Code == par.Service.Code)
        .Cast<ParPhase>()
        .Union(
            phases.OfType<ParTypePhase>()
            .Where(p => p.ParType.Code == par.Type.Code)
            .Cast<ParPhase>()
         );