类不被识别为实现接口

Question

I have the following classes:

namespace Model {
    public abstract class TrackerBase : ITrackerComponent { }

    public class ClickTracker : TrackerBase, IClickRecorder { }

    public class ClicksLeftTracker : TrackerBase, IClickRecorder { }
}

namespace Model.Interfaces {
    public interface IClickRecorder
    {
        List<DateTime> Clicks { get; }
    }
    public interface ITrackerComponent : INotifyPropertyChanged 
    {
        int ID { get; set; }
        string Name { get; set; }
        ICommand OnOptionsClick { get; set; }
        // ... etc
    }
}

ClickTracker and ClicksLeftTracker are very similar in their implementation and have implemented the IClickRecorder interface properly.

When I pass a ClickTracker as a parameter to TrackerOptionsPage(ITrackerComponent) it is recognised as implementing IClickRecorder and IsVisible is set to true.

However, when I pass a ClicksLeftTracker as a parameter, it's set to false as if it's not implementing IClickRecorder .

The full flow from start to the method in question is:

// GetAllTrackers() returns IEnumerable<ITrackerComponent>
var allTrackers = _dataSource.GetAllTrackers();
allTrackers.ToList().ForEach(AddItemToGrid);

private void AddItemToGrid(ITrackerComponent item) {
    item.OnOptionsClick = 
        new Command(async () => await Navigation?.PushAsync(new TrackerOptionsPage(item, _dataSource)));
    // ...
}

public TrackerOptionsPage(ITrackerComponent trackerToShow) {
    ClickDatasSettings.IsVisible = trackerToShow is IClickRecorder;
    // ...
}

What is going on here?

Answer 1

I solved it by manually uninstalling the app from the android emulator I was using and running it from Xamarin studio again.

Seems there was some old assembly that wasn't being updated correctly on clean/rebuild, and it's probably related to me using two different computers with one having Xamarin Studio (OSX) and one having Visual Studio (Windows) when developing.

Thes issue with assemblies not updating on rebuild which lead me to my conclusion was found here.