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Exception Handling in .NET 8.0

Posted on by Pablo Francesco

In.NET 8, the IExceptionHandler interface was added to handle exceptions on a global scale. This interface is used internally by ASP.NET Core apps to handle exceptions automatically. Compared to previous methods we’ve seen, this approach is superior.

TryHandleAsync, a function of the IExceptionHandler interface that deals with the error and the HTTP context, must be implemented. One advantage is that it leverages the built-in UseExceptionHandler middleware in.NET, so you don’t have to develop any additional middleware.

This makes your code more modular and easier to maintain by allowing you to define error handling for each error independently, if necessary.

Tools that I have used for this tutorial.

  • VS 2022 Community Edition 17.10
  • .NET 8.0
  • Minimal API

Let us create a minimal API with the below endpoint. For demo purposes, I have added this endpoint to the Program.cs file.

app.MapGet("/ExceptionHandler/", () =>
{
    throw new Exception("Testing the IExceptionHandler in .NET 8.0");
})
.WithName("ThrowException")
.WithOpenApi();

Global Exception Handler class.

using Microsoft.AspNetCore.Diagnostics;
using Microsoft.AspNetCore.Mvc;

namespace IExceptionHandlerTutorial.Infrastructure
{
    public class GlobalExceptionHandler(

        ILogger<GlobalExceptionHandler> logger

        ) : IExceptionHandler
    {

        public async ValueTask<bool> TryHandleAsync(HttpContext httpContext,
                                              Exception exception,
                                              CancellationToken cancellationToken)
        {
            logger.LogError(exception, "An unhandled exception has occurred.");

            var problemDetails = new ProblemDetails
            {
                Title = "An error occurred",
                Status = StatusCodes.Status500InternalServerError,
                Detail = exception.Message
            };

            return true;
        }
    }
}

The TryHandleAsync method is where you put all your exception-handling code. This method should return true if the exception is handled properly. If the exception isn’t handled or for specific use cases, it can return false. This is useful when you want to use multiple IExceptionHandler implementations for different errors.

After you’ve finished implementing IExceptionHandler, go to Program.cs and add the following code.

//Exception handling
builder.Services.AddExceptionHandler<GlobalExceptionHandler>();
builder.Services.AddProblemDetails();

This ensures that your IExceptionHandler implementation is registered in the application’s service container along with ProblemDetails. Additionally, you need to add the built-in exception middleware to the pipeline, as mentioned earlier.

Now, run the application and call the minimal API endpoint we created before.

Conclusion

By implementing IExceptionHandler and integrating it into your application, you streamline exception handling, making your code more modular and maintainable. Registering your IExceptionHandler with the service container and adding the built-in exception middleware ensures that your application can effectively manage errors. Now, with everything set up, you can run your application and test the error handling through the minimal API endpoint we created. This approach not only simplifies your exception-handling process but also enhances the robustness and clarity of your code.

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