private void SendError(FlutnetMethodInfo methodInfo, PlatformOperationException exception)
{
FlutnetMessage message = new FlutnetMessage
{
MethodInfo = methodInfo,
// NOTE: Please consider remove ErrorCode and ErrorMessage
ErrorCode = FlutnetErrorCode.OperationFailed,
ErrorMessage = exception.Message,
Exception = exception
};
Send(message);
}
private void SendResult(FlutnetMethodInfo methodInfo, object result)
{
Dictionary <string, object> resultValue = new Dictionary <string, object>();
resultValue.Add("ReturnValue", result);
FlutnetMessage message = new FlutnetMessage
{
MethodInfo = methodInfo,
Result = resultValue
};
Send(message);
}
private void SendError(FlutnetMethodInfo methodInfo, PlatformOperationException exception)
{
FlutnetMessage message = new FlutnetMessage
{
MethodInfo = methodInfo,
// NOTE: Please consider removing ErrorCode and ErrorMessage
ErrorCode = FlutnetErrorCode.OperationFailed,
ErrorMessage = exception.Message,
Exception = exception
};
NSObject dartReturnValue = FlutterInterop.ToMethodChannelResult(message);
Console.WriteLine("Sending error to Flutter...");
MainThread.BeginInvokeOnMainThread(() => _methodChannelIncoming.InvokeMethod("error", dartReturnValue));
}
private void SendResult(FlutnetMethodInfo methodInfo, object result)
{
Dictionary <string, object> resultValue = new Dictionary <string, object>();
resultValue.Add("ReturnValue", result);
FlutnetMessage message = new FlutnetMessage
{
MethodInfo = methodInfo,
Result = resultValue
};
NSObject dartReturnValue = FlutterInterop.ToMethodChannelResult(message);
Console.WriteLine("Sending result to Flutter...");
MainThread.BeginInvokeOnMainThread(() => _methodChannelIncoming.InvokeMethod("result", dartReturnValue));
}
private void BackgroundHandleMethodCall(FlutnetMethodInfo methodInfo, FlutterMethodCall call)
{
FlutnetRuntime.OperationInfo operation;
try
{
operation = FlutnetRuntime.GetOperation(methodInfo.Instance, methodInfo.Operation);
}
catch (Exception)
{
SendError(methodInfo, new FlutnetException(FlutnetErrorCode.OperationNotImplemented));
return;
}
NSDictionary dartArguments = call.Arguments as NSDictionary;
if (operation.Parameters.Length > 0 && dartArguments == 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;
NSString paramName = new NSString(param.Name.FirstCharUpper());
object value;
if (dartArguments.ContainsKey(paramName))
{
NSObject argumentValue = dartArguments[paramName];
NSString serializedArg = (NSString)argumentValue;
// Deserialize the arg value
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);
}
}