ASP.NET Core 6.0 Middleware Interference with Custom Exception Handling
I'm writing unit tests and I'm having trouble with I am working on an ASP.NET Core 6.0 application where I have implemented a custom middleware for global exception handling. However, I am experiencing an issue where some exceptions do not get caught, leading to a generic error response instead of my custom response. I believe the order of middleware in the pipeline might be affecting this, but I am not sure. Here's a simplified version of my middleware: ```csharp public class ExceptionHandlingMiddleware { private readonly RequestDelegate _next; public ExceptionHandlingMiddleware(RequestDelegate next) { _next = next; } public async Task InvokeAsync(HttpContext context) { try { await _next(context); } catch (Exception ex) { await HandleExceptionAsync(context, ex); } } private Task HandleExceptionAsync(HttpContext context, Exception ex) { context.Response.ContentType = "application/json"; context.Response.StatusCode = (int)HttpStatusCode.InternalServerError; var result = JsonSerializer.Serialize(new { error = ex.Message }); return context.Response.WriteAsync(result); } } ``` I have registered this middleware in `Startup.cs` like this: ```csharp public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { app.UseMiddleware<ExceptionHandlingMiddleware>(); app.UseRouting(); app.UseAuthorization(); app.UseEndpoints(endpoints => { endpoints.MapControllers(); }); } ``` The issue arises when I throw a custom exception from one of my controllers, like this: ```csharp [HttpGet] public IActionResult GetData() { throw new CustomNotFoundException("Data not found"); } ``` In this case, the response is not formatted using my middleware and instead returns the default error response from ASP.NET Core. I have also tried rearranging the middleware in different orders, but the behavior remains the same. I even added logging within the middleware, but it appears that the exception is bypassing it altogether. Is there something I am missing with the middleware configuration or exception handling in ASP.NET Core that would prevent my middleware from catching certain exceptions? My development environment is Windows 10. Any help would be greatly appreciated! This issue appeared after updating to C# LTS. Any examples would be super helpful.