private void BackgroundHandleMethodCall(FlutnetMethodInfo methodInfo, MethodCall call) { FlutnetRuntime.OperationInfo operation; try { operation = FlutnetRuntime.GetOperation(methodInfo.Instance, methodInfo.Operation); } catch (Exception) { SendError(methodInfo, new FlutnetException(FlutnetErrorCode.OperationNotImplemented)); return; } if (operation.Parameters.Length > 0 && call.Arguments() == null) { SendError(methodInfo, new FlutnetException(FlutnetErrorCode.OperationArgumentCountMismatch)); return; } object[] arguments = new object[operation.Parameters.Length]; try { for (int i = 0; i < operation.Parameters.Length; i++) { ParameterInfo param = operation.Parameters[i]; Type paramType = param.IsOut || param.ParameterType.IsByRef ? param.ParameterType.GetElementType() : param.ParameterType; string paramName = param.Name.FirstCharUpper(); object value; if (call.HasArgument(paramName)) { Object argumentValue = call.Argument(paramName); string serializedArg = argumentValue.ToString(); // Deserialize the argument value = JsonConvert.DeserializeObject(serializedArg, paramType, FlutterInterop.JsonSerializerSettings); } else if (param.HasDefaultValue) { value = param.DefaultValue; } else { SendError(methodInfo, new FlutnetException(FlutnetErrorCode.InvalidOperationArguments)); return; } arguments[i] = value; } } catch (Exception) { SendError(methodInfo, new FlutnetException(FlutnetErrorCode.OperationArgumentParsingError)); return; } PlatformOperationResult result = PlatformOperationRunner.Run(operation, arguments); if (result.Error != null) { if (result.Error is PlatformOperationException flutterException) { SendError(methodInfo, flutterException); } else { //In case of an unhandled exception, send to Flutter a verbose error message for better diagnostic FlutnetException error = new FlutnetException(FlutnetErrorCode.OperationFailed, result.Error.ToStringCleared(), result.Error); SendError(methodInfo, error); } } else { SendResult(methodInfo, result.Result); } }