gistfile1.txt

 public class PageUriLocator
    {

        public static string GetUri<T>() where T : Page
        {
            var typeName = typeof(T).Name;

            var allXamlFiles = ReadAssemblyResource(typeof(T).Assembly);

            var fileName = new Regex(@"/" + typeName.ToLower() + @"\.xaml");
            var uri = (allXamlFiles.Where(xamlFile => fileName.IsMatch(xamlFile.ToLower()))
                .Select(xamlFile => xamlFile))
                .FirstOrDefault();

            if (uri == null)
            {
                fileName = new Regex(@"[[\w]*/?]?" + typeName.ToLower() + @"\.xaml");
                uri = (allXamlFiles.Where(xamlFile => fileName.IsMatch(xamlFile.ToLower()))
                    .Select(xamlFile => xamlFile))
                    .FirstOrDefault();
            }


            if (uri != null)
                return uri.Substring(0, uri.Length - 5);

            return uri;
        }

        private static  Dictionary<Assembly, List<string>> assemblyFilenames=new Dictionary<Assembly, List<string>>();
        private static List<string> ReadAssemblyResource(Assembly a)
        {
            //Warning: The Assembly needs to contain a app.xaml for this to work!!!!

            List<string> fn;
            if (assemblyFilenames.TryGetValue(a, out fn))
                return fn;

            byte[] binaryData = GetResourceInByteArray(a);
            var fileNames = new List<string>();

            // the first x bytes of the resource stream we are not interested in
            bool start = false;
            var appXamlName = Encoding.Unicode.GetBytes("app.xaml"); 
            for (int i = 0; i < binaryData.Length; i++)
            {
                if (i < binaryData.Length - 255 && i > 0)
                {
                    // 6100700070002E00780061006D006C00

                    if (!start)
                    {
                        int x = 0;
                        start = appXamlName.All(b => binaryData[i + x++] == b);

                        // wenn der name "app.xaml" geunden wurde, einfach nochmal 3 byte zurück, damit man normal von vorne die Länge auslesen kann
                        if (start)
                            i = i - 3;
                    }

                    if (start)
                    {
                        int length = binaryData[i + 1];
                        if (length == 0)
                        {
                            length = binaryData[i + 2];
                        }

                        if (length > 255) 
                            return fileNames; // name cannot be longer then 255 characters
                        
                        // wenn der name mit 01 anfängt, muss man um 1 verschieben
                        if (binaryData[i + 3] == 1)
                            i = i + 1;

                        // assemble the filename
                        string fileName = "";

                        for (int j = 0; j < length; j += 2)
                        {
                            fileName += Convert.ToChar(binaryData[j + i + 3]);
                        }

                        fileNames.Add(fileName);
                        i += length + 4;
                    }
                }
            }

            assemblyFilenames.Add(a, fileNames);

            return fileNames;
        }

        private static byte[] GetResourceInByteArray(Assembly a)
        {
            // get the assembly name
            var assemblyName = a.FullName.Split(',')[0];

            // a list of resources is saved in an embedded resource file called [AssemblyName].g.resources
            var resourceName = assemblyName + ".g.resources";

            // read binary data from the stream
            var resourceStream = a.GetManifestResourceStream(resourceName);
            var streamReader = new BinaryReader(resourceStream);
            return streamReader.ReadBytes((int)resourceStream.Length);
        }
    }