ESRI.ArcGIS.Client.Toolkit.DataSources.WebTiledLayer.GetTileUrl C# (CSharp) Method

		public override string GetTileUrl(int level, int row, int col)
		{
			// Select a subdomain based on level/row/column so that it will always
			// be the same for a specific tile. Multiple subdomains allows the user
			// to load more tiles simultaneously. To take advantage of the browser cache
			// the following expression also makes sure that a specific tile will always 
			// hit the same subdomain.
			if (level + col + row < 0 || _templateUrl == null) return null;

			string levelValue = null;
			if (LevelValues != null && LevelValues.Length > level)
				levelValue = LevelValues[level];
			if (string.IsNullOrEmpty(levelValue))
				levelValue = level.ToString(CultureInfo.InvariantCulture);

			string subDomain = _subDomains != null && _subDomains.Length > 0
				                   ? _subDomains[(level + col + row)%_subDomains.Length]
				                   : null;

			string url = _templateUrl.Replace("{level}", levelValue)
			                        .Replace("{row}", row.ToString(CultureInfo.InvariantCulture))
			                        .Replace("{col}", col.ToString(CultureInfo.InvariantCulture));

			if (subDomain != null)
				url = url.Replace("{subDomain}", subDomain);

			return url;
		}