csharp_xulrunner_host_interface.cs

public static class ControllerInterface
	{
		public static void DoHostCall(GeckoWebBrowser w, object controller)
		{
			try
			{
				var e = w.Document.GetElementsByTagName("callinfo").First();

				var methodName = e.GetAttribute("funcname");
				var method = controller.GetType().GetMethod(methodName);
				if (method == null)
					throw new InvalidOperationException(
						"No such method `{0}` on managed controller".F(methodName));

				var argc = int.Parse(e.GetAttribute("argc"));
				var args = Range(0, argc)
					.Select(i => MarshalParamFromJs(e.GetAttribute("arg_" + i),
						method.GetParameters()[i]));

				var result = method.Invoke(controller, args.ToArray());
				if (result != null)
					e.SetAttribute("retval", result.ToString());
			}
			catch (Exception e)
			{
				MessageBox.Show("{0}".F(e));
			}
		}

		static IEnumerable<int> Range(int low, int high)
		{
			while (low < high)
				yield return low++;
		}

		static object MarshalParamFromJs(string jsarg, ParameterInfo pi)
		{
			if (pi.ParameterType == typeof(string))
				return jsarg;
			if (pi.ParameterType == typeof(bool))
				return jsarg == "true";

			throw new Exception("You can't marshal this! Marshaling value `{0}` to `{1}`"
				.F(jsarg, pi.ParameterType));
		}
	}