Passing class as parameter in C# and then wanting to access property of class

Question

I'm trying to refactor some code as I have about 7 occurrences of code like this:

List<RHEvent> eventResults = DBConnection.Table<RHEvent>().Where(t => (int)t.PreferredImage == ID).ToList();
foreach (RHEvent result in eventResults)
{
    result.PreferredImage = 0;
    DBConnection.Update(result);
}

where RHEvent changes to different class names through the different occurrences.

I've started to try and write more generalised code but I'm hitting a snag. Here is what I've got so far:

private void ResetPreferredImage<T>(int ID) where T: new()
{
    List<T> results = DBConnection.Table<T>().Where(t => (int)t.PreferredImage == ID).ToList();
}

The problem is that the compiler doesn't like PreferredImage because it cannot identify it in the abstract class.

Is there a way to reassure the compiler that the property exists or is it simply not possible to do what I'm trying to do?

Thanks.

Philip

Answer 1

you can try something like this

private void ResetPreferredImage<T>(int ID) where T : BaseClass,new()
        {
            List<T> results = DBConnection.Table<T>().Where(t => (int)t.PreferredImage == ID).ToList(); 
        }

Now the Compiler will recognize the PreferredImage Property as a property of a base class

Answer 2

If they do not implement a base class which exposes a PrefferedImage property, your only other option would be to use reflector.

See C# Reflection and Getting Properties