Develop Reference

Telegram bot in asp.net core 3.1 is giving no data in Update object

I am developing telegram notifications in my existing asp.net core 3.1 project. I have written below code in controller.
#region Telegram
TelegramBotClient _botService;
private const string token = "332435:45345345345dflskdfjksdjskdjflkdd";
[HttpPost("Update")]
[AllowAnonymous]
public async Task<IActionResult> Update([FromBody] Update update)
{
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
if (_botService == null)
_botService = new TelegramBotClient(token);
if (update.Type != UpdateType.Message)
return Ok(new Response
{
code = (int)HttpStatusCode.OK,
status = "Ok",
message = "Success"
});
var message = update.Message;
try
{
_logger.LogInformation("Received Message from {0}", message.Chat.Id);
switch (message.Type)
{
case MessageType.Text:
if (message.Text.Contains("/Reset"))
{
//Delete(string chatid)
var response = _UserRepository.DeleteTeleBotChatID(message.Chat.Id);
if (response)
await _botService.SendTextMessageAsync(message.Chat.Id, "You have successfully unsubscribed.");
else
await _botService.SendTextMessageAsync(message.Chat.Id, "You are not registered yet.");
}
else
if (message.Text.Contains("/") && !message.Text.ToLower().Contains("/start"))
{
var user = Crypto.decrypt(Encoding.UTF8.GetString(Convert.FromBase64String(message.Text.Split('/').Last())));
var response = _UserRepository.UpdateTeleBotChatIDByUser(new TeleBotModel() { ChatId = message.Chat.Id, Username = user });
if (response)
await _botService.SendTextMessageAsync(message.Chat.Id, $"You have successfully subscribe notifications for {user}.");
else
await _botService.SendTextMessageAsync(message.Chat.Id, "Username is not valid");
// var chat=modifyus(string username,chatid)
}
else
{
await _botService.SendTextMessageAsync(message.Chat.Id, "Enter your encrypted username.\n Type /Reset to unsubscribe.");
}
break;
case MessageType.Photo:
// Download Photo
var fileId = message.Photo.LastOrDefault()?.FileId;
var file = await _botService.GetFileAsync(fileId);
var filename = file.FileId + "." + file.FilePath.Split('.').Last();
using (var saveImageStream = System.IO.File.Open(filename, FileMode.Create))
{
await _botService.DownloadFileAsync(file.FilePath, saveImageStream);
}
await _botService.SendTextMessageAsync(message.Chat.Id, "Thx for the Pics");
break;
}
}
catch (Exception exp)
{
//LoggerSimple.Error(exp);
await _botService.SendTextMessageAsync(message.Chat.Id, "Wrong Bot command");
}
return Ok(new Response
{
code = (int)HttpStatusCode.OK,
status = "Ok",
message = "Success"
});
}
[HttpPost]
public async Task<IActionResult> sendTeleMsg(TelegramMessgae Data)
{
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
if (_botService == null)
_botService = new TelegramBotClient(token);
//check username exist
long ChatId = _UserRepository.GetChatIdByUsername(Data.Username);
if (ChatId == -1)
{
return Ok(new Response
{
error = "true",
code = HttpStatusCode.BadRequest,
status = HttpStatus.OK,
message = "Not registered with telegram bot"
});
}
try
{
await _botService.SendTextMessageAsync(ChatId, string.Format("*{0}*\n{1}", parseMText(Data.Subject), parseMText(Data.Message)), ParseMode.Markdown);
return Ok(new Response
{
code = HttpStatusCode.OK,
status = HttpStatus.OK,
message = "Message Sent"
});
}
catch (Exception exp)
{
//if wrong chatid
_UserRepository.DeleteTeleBotChatID(ChatId);
return Ok(new Response
{
error = "true",
code = HttpStatusCode.BadRequest,
status = HttpStatus.OK,
message = exp.Message
});
}
}
private string parseMText(string txt)
{
var vs = new string[] { "*", "_", "`", "[", "]" };
foreach (var item in vs)
{
txt = txt.Replace(item, "\\" + item);
}
return txt;
}
#endregion
then used ngrok for tunnelling and exposed localhost so that I can connect with telegram bot. After creating and subscribing the bot, I am able to receive a breakpoint in above Update method but data was nothing. I sent messages on bot but always there is no data in update object. See below screenshot.
I am unable to figure-out the issue in the code. Can anyone pls help?

Calling AddNewtonsoftJson() function in starup.cs file fixed the issue.
services.AddControllers().AddNewtonsoftJson();

ASP.NET MVC How to debug a published folder

Good day Someone.
I am new to asp.net mvc.
I created a simple web application using asp.net mvc.
The application is used to upload image from to a folder. The application works well in visual studio, but once i publish and put on iis it does not upload the image.
I am thinking if there is way to debug the published version so that i can get where the issued is ?
Kindly help on how i can debug the published version and how to solve the problem .
Below is where it is catching the error
string path = System.IO.Path.Combine(targetLocation, file.FileName);

I Would suggest doing the debugging for ASP.NET MVC Application to follow the below points.
Server-side - You should use do exception filter to write any issues to text files and track it
Front - End - the developer tool in the browser level for javascript related things.
DataBase Side - You can use the SQL profiler to use catch the server-side debugging.

add try catch block in your codes
and in the catch code log the exception error message into a file in server to see what is the exact error as following:
add this model to your solution under "Models" folder or anywhere
public class ExceptionLogger
{
private string sLogFormat;
public void ErrorLog(string sErrMsg)
{
try
{
string LogDirectory = "C:\LogFiles\";
CheckCreateLogDirectory(LogDirectory);
LogDirectory = (LogDirectory + "Log_" + DateTime.Now.ToString("dd_MM_yyyy", new CultureInfo("en-us")) + ".txt");
sLogFormat = DateTime.Now.ToString("dd/MM/yyyy", new CultureInfo("en-us")) + " " + DateTime.Now.ToString("HH:mm:ss", new CultureInfo("en-us")) + " ==> ";
StreamWriter sw = new StreamWriter(LogDirectory, true);
sw.WriteLine(sLogFormat + sErrMsg);
sw.Flush();
sw.Close();
}
catch (Exception e) {
}
}
private bool CheckCreateLogDirectory(string LogPath)
{
bool loggingDirectoryExists = false;
DirectoryInfo oDirectoryInfo = new DirectoryInfo(LogPath);
if (oDirectoryInfo.Exists)
{
loggingDirectoryExists = true;
}
else
{
try
{
Directory.CreateDirectory(LogPath);
loggingDirectoryExists = true;
}
catch
{
throw new Exception();
// Logging failure
}
}
return loggingDirectoryExists;
}
}
Then in your controller or repository where errors may happen do the following:
a- add this code in top:
ExceptionLogger Err = new ExceptionLogger();
//you need to write "using" in top to refactor the import error
// something like this: using YourProjectName.Models;
b- in your code blocks add try catch block
try{
//your code
}catch(Exception ex){
Err.ErrorLog(ex.Message + " --- , ---- " + ex.InnerException);
}
another way is to add OnException event on your BaseController which will detect any error or exception, hence you can log it without try-catch blocks, do it as following:
define this in your baseController: ExceptionLogger Err = new ExceptionLogger(); with its using then add the event:
protected override void OnException(ExceptionContext filterContext)
{
var isSent = false;
if (filterContext.ExceptionHandled || !filterContext.HttpContext.IsCustomErrorEnabled)
{
return;
}
if (new HttpException(null, filterContext.Exception).GetHttpCode() != 500)
{
return;
}
if (filterContext.HttpContext.Request.Headers["X-Requested-With"] == "XMLHttpRequest")
{
filterContext.Result = new JsonResult
{
JsonRequestBehavior = JsonRequestBehavior.AllowGet,
Data = new
{
error = true,
message = filterContext.Exception.Message
}
};
LogError("Controller: AjaxCall" + " Action: AjaxCall" + filterContext.Exception.Message, filterContext.Exception);
}
else if (filterContext.Exception is HttpAntiForgeryException)
{
Response.Clear();
Server.ClearError(); //make sure you log the exception first
filterContext.Result = new RedirectToRouteResult(
new RouteValueDictionary(new { action = "Logout", controller = "Account" }));
}
else
{
var controllerName = (string)filterContext.RouteData.Values["controller"];
var actionName = (string)filterContext.RouteData.Values["action"];
var model = new HandleErrorInfo(filterContext.Exception, controllerName, actionName);
if (actionName == "_Menu")
{
isSent = true;
Response.Redirect("~/Account/Logout");
}
filterContext.Result = new ViewResult
{
ViewName = "~/Views/Error/Error.cshtml",
MasterName = null,
ViewData = new ViewDataDictionary(model),
TempData = filterContext.Controller.TempData
};
////Redirect or return a view, but not both.
LogError("Controller: " + controllerName + " Action: " + actionName + filterContext.Exception.Message, filterContext.Exception);
}
// log the error by using your own method
filterContext.ExceptionHandled = true;
filterContext.HttpContext.Response.Clear();
if (isSent == false)
{
filterContext.HttpContext.Response.StatusCode = 500;
}
filterContext.HttpContext.Response.TrySkipIisCustomErrors = true;
}
private void LogError(string message, Exception exception)
{
Err.ErrorLog(message + " && " + exception.Message);
}
now when errors happen then you will go to c:/logfiles folder in the server and find the exact error happened

Task<T>.Factory.StartNew in ASP.NET MVC

I'm stuck with a problem. I need help...
In general, I have an ASP.NET MVC 5 project. When a user clicks on "Save" button, I run some code in a new created task. I need to know the result of operation, so I return the instance of my class ChangesMade. Then I serialze the object to JSON format and pass to a view. Then I check if result is true, I open an url in a new window.
So, in my controller I have the following:
public async Task<ActionResult> Save(here some parameters)
{
var changes = await _model.SaveAsync(some parameters);
return NewtownJson(changes);
}
The main saving logic is the following:
public async Task<ChangesMade> SaveAsync(some parameters here)
{
var data = (await _model.GetData(some parameter)).ToList();
// create a task of ChangesMade that contains public bool property MemoAdded
// that I need to pass to a view to know the result of operation
var task = Task<ChangesMade>.Factory.StartNew(() =>
{
ChangesMade changes = new ChangesMade();
try
{
using (var tr = new TransactionScope())
{
// some code here omitted for simplicity…
// if (someCondition == true) changes.MemoAdded = true;
tr.Complete();
}
return changes;
}
catch (Exception ex)
{
throw ex;
}
});
try
{
task.Wait();
}
catch (AggregateException ex)
{
string msg = "";
msg= ex.Flatten().InnerExceptions
.Where(e => e != null)
.Select(e => e.Message)
.Aggregate(msg, (current, message) => current + " " + message + ";")
.TrimEnd(';');
throw new Exception(msg);
}
return task.Result;
}
I publish the project on two sites on IIS. The first works fine. But the second doesn't - by some reason, it always returns changes.MemoAdded false to the view.
I can't find out a reason of that. I don't have a clue what to do ...

LiveConnectException using live sdk

i'm new to Live SDK and i'm trying to use it to connect to a user's profile and get data from it
i have read about it and used the following code to login to user's account
private async void btnSignin_SessionChanged(object sender, LiveConnectSessionChangedEventArgs e)
{
if (e.Status == LiveConnectSessionStatus.Connected)
{
session = e.Session;
client = new LiveConnectClient(session);
try
{
LiveAuthClient auth = new LiveAuthClient(btnSignin.ClientId);
//LiveLoginResult initializeResult = await auth.InitializeAsync();
try
{
LiveLoginResult loginResult = await auth.LoginAsync(new string[] { "wl.basic" });
if (loginResult.Status == LiveConnectSessionStatus.Connected)
{
LiveConnectClient connect = new LiveConnectClient(auth.Session);
LiveOperationResult operationResult = await connect.GetAsync("me");
dynamic result = operationResult.Result;
if (result != null)
{
this.infoTextBlock.Text = string.Join(" ", "Hello", result.name, "!");
}
else
{
this.infoTextBlock.Text = "Error getting name.";
}
}
}
catch (LiveAuthException exception)
{
this.infoTextBlock.Text = "Error signing in: " + exception.Message;
}
catch (LiveConnectException exception)
{
MessageBox.Show("Error calling API: " + exception.Message);
}
}
catch (LiveAuthException exception)
{
this.infoTextBlock.Text = "Error initializing: " + exception.Message;
}
}
else
{
client = null;
}
}
it logs in on my emulator and one of my 2 lumia 620 devices but with the other device it gives me the following Exception
**
*> {client_error: Microsoft.Live.LiveConnectException: Exception of type
'Microsoft.Live.LiveConnectException' was thrown. at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at PhoneApp2.MainPage.d__6.MoveNext()}*
**

FacebookOAuthException was unhandled

I'm new in these things and I've been testing the api ...
and came to me a situation that is:
if the user changes the password of Facebook
the Access token is renewed ... and try to post the API Launches
an exception and the application crashes...
how to resolve this situation?
try {
FacebookApp app = new FacebookApp(FacebookToken);
var args = new Dictionary<string, object>();
args["message"] = "hi";
args["caption"] = "appcaption";
args["description"] = "appdescription";
args["name"] = "appname";
args["picture"] = "apppicture";
args["link"] = "applink";
app.ApiAsync((X) => { calback(X); }, null, "/me/feed", args, HttpMethod.Post);
}
catch (Exception ex) {
Uri url = new Uri("/MyFacebook.xaml", UriKind.Relative);
NavigationService.Navigate(url);
}
this is Api code, and it's crashing when throwing the OAuthExcepion at the line marked with "Exception HERE"
private static void ResponseCallback(IAsyncResult asyncResult, FacebookAsyncCallback callback, object state)
{
object result = null;
FacebookApiException exception = null;
try
{
var request = (HttpWebRequest)asyncResult.AsyncState;
var response = (HttpWebResponse)request.EndGetResponse(asyncResult);
using (Stream responseStream = response.GetResponseStream())
{
result = JsonSerializer.DeserializeObject(responseStream);
}
}
catch (FacebookApiException)
{
// Rest API Errors
throw;
}
catch (WebException ex)
{
// Graph API Errors or general web exceptions
exception = ExceptionFactory.GetGraphException(ex);
if (exception != null)
{
// Thow the FacebookApiException
throw exception;
}
throw; //Exception HERE
}
finally
{
// Check to make sure there hasn't been an exception.
// If there has, we want to pass null to the callback.
object data = null;
if (exception == null)
{
data = result;
}
#if SILVERLIGHT
callback(new FacebookAsyncResult(data, state, null, asyncResult.CompletedSynchronously, asyncResult.IsCompleted, exception));
#else
callback(new FacebookAsyncResult(data, state, asyncResult.AsyncWaitHandle, asyncResult.CompletedSynchronously, asyncResult.IsCompleted, exception));
#endif
}
}
thanks

The behavior of the SDK is intended. An exception is not "crashing" the application, but rather telling you when an error state has occurred. You are basically doing it correctly, but instead of catching Exception you should only catch FacebookOAuthException like this:
try {
FacebookApp app = new FacebookApp(FacebookToken);
var args = new Dictionary<string, object>();
args["message"] = "hi";
args["caption"] = "appcaption";
args["description"] = "appdescription";
args["name"] = "appname";
args["picture"] = "apppicture";
args["link"] = "applink";
app.ApiAsync("/me/feed", args, (X) => { calback(X); }, HttpMethod.Post);
}
catch (FacebookOAuthException) {
// This is where you would reauthorize the user or send them to a 'login' page
Uri url = new Uri("/MyFacebook.xaml", UriKind.Relative);
NavigationService.Navigate(url);
}
I would also suggest reading up on .Net exception handling to give you a better understanding of when and why they are used. http://msdn.microsoft.com/en-us/library/ms229005.aspx

Using the FacebookAuthenticationResult you can check if there was an error and then avoid to do the request:
private void FacebookLoginBrowser_Navigated(object sender, System.Windows.Navigation.NavigationEventArgs e)
{
FacebookAuthenticationResult authResult;
if (FacebookAuthenticationResult.TryParse(e.Uri, out authResult))
{
if (authResult.ErrorReason == "user_denied")
{
// Do something knowing that this failed (cancel). }
else
{
fbApp.Session = authResult.ToSession();
loginSucceeded();
}
}
}

Have you seen this post? http://dotnetslackers.com/articles/net/wFace-windows-phone-7-facebook-integration-part-1.aspx
Specifically, take a look at part 3 - http://dotnetslackers.com/articles/net/wp7Gesicht-windows-phone-7-facebook-integration-part-3.aspx
Could you store the access token, and then on error, show the login page again?