Resolution helpers for Windows Phone

WPResolutionHelper

 public static class ResolutionHelper
    {
        public static Uri GetScaledImageUri(String imageName)
        {
            int scaleFactor = (int)Application.Current.Host.Content.ScaleFactor;
            switch (scaleFactor)
            {
                case 100: return new Uri(imageName + "_wvga.png", UriKind.RelativeOrAbsolute);
                case 150: return new Uri(imageName + "_720p.png", UriKind.RelativeOrAbsolute);
                case 160: return new Uri(imageName + "_wxga.png", UriKind.RelativeOrAbsolute);
                default: throw new InvalidOperationException("Unknown resolution type");
            }
        }

        public static string GetResolutionString()
        {
            int scaleFactor = (int)Application.Current.Host.Content.ScaleFactor;
            switch (scaleFactor)
            {
                case 100: return "wxga"; //should return wvga
                case 150: return "720p";
                case 160: return "wxga";
                default: throw new InvalidOperationException("Unknown resolution type");
            }
        }

        public static bool IsWvga
        {
            get
            {
                return Application.Current.Host.Content.ScaleFactor == 100;
            }
        }

        public static bool IsWxga
        {
            get
            {
                return Application.Current.Host.Content.ScaleFactor == 160;
            }
        }

        public static bool Is720p
        {
            get
            {
                return Application.Current.Host.Content.ScaleFactor == 150;
            }
        }
    }