How to catch ASP.NET Core 2 SignalR exceptions on server-side and handle them on client side with JavaScript?

How to catch ASP.NET Core 2 SignalR exceptions on server-side and handle them on client side with JavaScript?

To catch SignalR exceptions on the server-side and handle them on the client-side with JavaScript in ASP.NET Core 2, you can follow these steps:

  • On the server-side, add an exception filter that catches the SignalR exceptions and returns them to the client-side using the HubException class:
using Microsoft.AspNetCore.SignalR; using System; public class CustomHubExceptionFilter : IHubExceptionFilter { public Task OnHubExceptionAsync(ExceptionContext exceptionContext, Exception exception) { if (exception is MyCustomException) { // Log the exception or perform any other actions here var message = "An error occurred"; exceptionContext.Result = new HubException(message); exceptionContext.Handled = true; } return Task.CompletedTask; } }
  • Register the filter in the Startup class:
public void ConfigureServices(IServiceCollection services) { services.AddSignalR(options => { options.AddFilter<CustomHubExceptionFilter>(); }); }
  • On the client-side, handle the exceptions in the catch block of the SignalR method:
connection.on("MyMethod", function (result) { // Handle the result here }).catch(function (error) { // Handle the error here });

This will catch the SignalR exceptions on the server-side and handle them on the client-side with JavaScript.

Examples

  1. "ASP.NET Core 2 SignalR catch exceptions on server-side"

    public class MyHub : Hub { public async Task SomeMethod() { try { // SignalR hub method logic } catch (Exception ex) { // Log or handle the exception await Clients.Caller.SendAsync("HandleException", ex.Message); } } }

    Description: Catches exceptions in a SignalR hub method on the server-side and sends an error message to the client.

  2. "Handle SignalR exceptions in ASP.NET Core 2 and send custom error messages"

    public class MyHub : Hub { public async Task SomeMethod() { try { // SignalR hub method logic } catch (Exception ex) { // Log or handle the exception await Clients.Caller.SendAsync("HandleException", "An error occurred while processing your request."); } } }

    Description: Sends a custom error message to the client when a SignalR hub method encounters an exception.

  3. "ASP.NET Core 2 SignalR handle specific exceptions"

    public class MyHub : Hub { public async Task SomeMethod() { try { // SignalR hub method logic } catch (SpecificException ex) { // Log or handle the specific exception await Clients.Caller.SendAsync("HandleException", ex.Message); } catch (Exception ex) { // Log or handle other exceptions await Clients.Caller.SendAsync("HandleException", "An error occurred while processing your request."); } } }

    Description: Handles a specific exception type differently and sends an appropriate error message to the client.

  4. "ASP.NET Core 2 SignalR global exception handling"

    public class MyHub : Hub { public async Task SomeMethod() { try { // SignalR hub method logic } catch (Exception ex) { // Log or handle the exception globally GlobalExceptionHandler.HandleException(ex); await Clients.Caller.SendAsync("HandleException", "An unexpected error occurred."); } } }

    Description: Utilizes a global exception handler to log or handle exceptions globally in SignalR.

  5. "ASP.NET Core 2 SignalR send exception details to client"

    public class MyHub : Hub { public async Task SomeMethod() { try { // SignalR hub method logic } catch (Exception ex) { // Log or handle the exception await Clients.Caller.SendAsync("HandleException", ex.ToString()); } } }

    Description: Sends detailed exception information to the client for better debugging.

  6. "ASP.NET Core 2 SignalR handle exceptions and continue processing"

    public class MyHub : Hub { public async Task SomeMethod() { try { // SignalR hub method logic } catch (Exception ex) { // Log or handle the exception and continue processing await Clients.Caller.SendAsync("HandleException", "An error occurred, but processing continues."); } } }

    Description: Handles exceptions in a SignalR hub method and informs the client that processing continues despite the error.

  7. "ASP.NET Core 2 SignalR handle exceptions with custom error codes"

    public class MyHub : Hub { public async Task SomeMethod() { try { // SignalR hub method logic } catch (Exception ex) { // Log or handle the exception and send a custom error code to the client await Clients.Caller.SendAsync("HandleException", new { errorCode = 500, errorMessage = "Internal Server Error" }); } } }

    Description: Sends a custom error code along with the error message to the client when handling exceptions in a SignalR hub method.

  8. "ASP.NET Core 2 SignalR handle exceptions and rethrow"

    public class MyHub : Hub { public async Task SomeMethod() { try { // SignalR hub method logic } catch (Exception ex) { // Log or handle the exception and rethrow it await Clients.Caller.SendAsync("HandleException", "An error occurred, and processing stopped."); throw; } } }

    Description: Handles exceptions in a SignalR hub method, sends an error message to the client, and rethrows the exception.

  9. "ASP.NET Core 2 SignalR handle exceptions and disconnect client"

    public class MyHub : Hub { public async Task SomeMethod() { try { // SignalR hub method logic } catch (Exception ex) { // Log or handle the exception and disconnect the client await Clients.Caller.SendAsync("HandleException", "An error occurred, and you are being disconnected."); await Clients.Caller.DisposeAsync(); } } }

    Description: Disconnects the client when an exception occurs in a SignalR hub method.

  10. "ASP.NET Core 2 SignalR handle exceptions and log them server-side"

    public class MyHub : Hub { private readonly ILogger<MyHub> _logger; public MyHub(ILogger<MyHub> logger) { _logger = logger; } public async Task SomeMethod() { try { // SignalR hub method logic } catch (Exception ex) { // Log the exception server-side _logger.LogError(ex, "An error occurred in SomeMethod."); // Send an error message to the client await Clients.Caller.SendAsync("HandleException", "An error occurred. Please try again later."); } } }

    Description: Logs exceptions server-side using an ILogger and sends a generic error message to the client.

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