Exception handling in .NET 8: IExecptionHandler

This is an example of how to handle exception globally by implementing IExceptionHandler in .NET 8 Minimal Api

ApiResponse.cs

record ApiResponse(bool Success, string Message);

AppExceptionHandler.cs

using Microsoft.AspNetCore.Diagnostics;

public class AppExceptionHandler : IExceptionHandler
{
    public async ValueTask<bool> TryHandleAsync(
        HttpContext httpContext,
        Exception exception,
        CancellationToken cancellationToken)
    {
        httpContext.Response.StatusCode = 501;
        httpContext.Response.ContentType = "application/json";
        await httpContext.Response.WriteAsJsonAsync(
            new ApiResponse(false, exception.Message),
            cancellationToken);
        return true;
    }
}

Program.cs

var builder = WebApplication.CreateBuilder(args);

// Adds an AppExceptionHandler to services
builder.Services.AddExceptionHandler<AppExceptionHandler>();

var app = builder.Build();

// Adds an exception handling middleware to the pipeline
app.UseExceptionHandler(_ => { });

app.MapGet("api", () =>
{
    throw new ApplicationException("Something went wrong");
});

app.Run();

Output

Ref: Microsoft