Compile error when inheriting from class

Question

This is my class called BoolToVisibilityValueConverter:

public class BoolToVisibilityValueConverter : MvxValueConverter<bool, ViewStates>
{
    protected override ViewStates Convert(bool value, Type targetType, object parameter, CultureInfo culture)
    {
        return value ? ViewStates.Visible : ViewStates.Gone;
    }

    protected override bool ConvertBack(ViewStates value, Type targetType, object parameter, CultureInfo culture)
    {
        return ViewStates.Visible == value;
    }
}

It inherits from MvxValueConverter which is a generic class taking parameters From and To. The source of the MvxValueConverter can be found on Github under MvvmCross' repository - MvxValueConverter.

I can build the project, run it and see it works. I am using Visual Studio 2015 with the latest Xamarin and the latest version of MvvmCross (4.0.0)

However, on our TeamCity server same build fails:

[14:40:06][Csc] ValueConverters\BoolToVisibilityValueConverter.cs(10, 33): error CS0115: 'MyProject.Droid.ValueConverters.BoolToVisibilityValueConverter.Convert(bool, System.Type, object, System.Globalization.CultureInfo)': no suitable method found to override

[14:40:06][Csc] ValueConverters\BoolToVisibilityValueConverter.cs(15, 27): error CS0115: 'MyProject.Droid.ValueConverters.BoolToVisibilityValueConverter.ConvertBack(Android.Views.ViewStates, System.Type, object, System.Globalization.CultureInfo)': no suitable method found to override

Error CS0115 from MSDN happens when A method was marked as an override, but the compiler found no method to override. The TeamCity has Visual Studio 2013 installed.

Why does my build fail?

Answer 1

You need to open your android projects .csproj file, and manually add a reference to System.Globalization