Error Handling - (SignalR Error Handling and Logging)

Syntax

public voidmethodName(parameterList) 
{
    try { 
        // code that may throw error
    }
    catch(Exception ex) { 
        // log the exception or throw it to handle at the client side
    }
}

Example

public async Task SendMessage(string message)
{
    try
    {
        await Clients.All.SendAsync("ReceiveMessage", message);
    }
    catch (Exception ex)
    {
        logger.LogError(ex, "Error occurred while sending message.");
        throw; //throwing the exception is optional depending on whether it needs to be handled at client side or not
    }
}

Output

The client will not receive the message and the error will be logged.

Explanation

SignalR is a real-time communication library that allows bi-directional communication between the server and the client. Error handling and logging are essential parts of any real-time application. SignalR provides various ways to handle errors at the server and the client sides.

At the server side, try-catch blocks are used to handle exceptions. If the exception is caught, it can either be logged or thrown to handle at the client side. In the above example, while sending a message, if any error occurs, it will be caught, logged, and thrown (optional) to handle at the client side.

Use

Error handling and logging are critical for any application that runs in a production environment. In SignalR, it is essential to handle errors and log them for troubleshooting purposes.

Important Points

• Use try-catch blocks to handle exceptions in SignalR applications.
• Log the exceptions for troubleshooting purposes.
• Throw the exception to handle it at the client side.

Summary

SignalR provides various ways to handle errors at the server and the client sides. Try-catch blocks, exception logging, and throwing exceptions are the standard ways to handle errors. These practices are critical for any application that runs in a production environment to troubleshoot, debug, and optimize the application.