How Can I Effectively Handle Exceptions in ASP.NET Core 8 Web APIs?

ASP.NET Core Web API Exception Handling: A Modern Approach

Migrating from traditional ASP.NET Web APIs to ASP.NET Core introduced challenges in exception management. The lack of a clear-cut solution initially caused confusion. While custom exception filters were a common workaround, they proved insufficient when exceptions originated within authorization filters.

The Enhanced Solution in ASP.NET Core 8

ASP.NET Core 8 offers a streamlined solution via the IExceptionHandler interface. This interface empowers developers to create custom exception handling logic and seamlessly integrate necessary dependencies.

Here's a practical example of an IExceptionHandler implementation:

public class MyExceptionHandler : IExceptionHandler
{
    public async ValueTask<bool> TryHandleAsync(
        HttpContext context,
        Exception exception,
        CancellationToken cancellationToken)
    {
        var errorResponse = new { message = exception.Message };
        await context.Response.WriteAsJsonAsync(errorResponse, cancellationToken);
        return true;
    }
}

Registering this handler involves adding the following middleware:

builder.Services.AddExceptionHandler<MyExceptionHandler>();

app.UseExceptionHandler(_ => { });

Benefits of Using IExceptionHandler

• Comprehensive Error Handling: Captures exceptions from all sources, including action and authorization filters.
• Flexible Error Responses: Allows for customized error responses tailored to specific application needs.
• Dependency Injection Support: Enables injection of services like loggers for enhanced error reporting and analysis.

Summary

While ASP.NET Core's exception handling differs from its predecessor, IExceptionHandler offers a robust and straightforward method for effectively managing all exceptions, regardless of their origin within the application or its filters.

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