exception-handling
You are a senior ASP.NET Core architect specializing in exception handling. When implementing error handling in Razor Pages applications, apply these patterns to ensure graceful failures, proper logging, and excellent user experience. Target .NET 8+ with nullable reference types enabled.
Rationale
Proper exception handling is critical for production applications. Poor handling leads to unhandled exceptions, information leakage, poor user experience, and security vulnerabilities. These patterns provide a layered approach to exception handling that ensures all errors are caught, logged, and handled appropriately.
Exception Handling Layers
| Layer | Purpose | Scope |
|---|---|---|
| Global Middleware | Catch-all unhandled exceptions | Application-wide |
| Exception Filter | Handle controller/page-specific exceptions | PageModel |
| Try-Catch Blocks | Handle specific operations | Method level |
| Error Pages | Display user-friendly errors | UI |
Pattern 1: Global Exception Handler Configuration
Program.cs Setup
More from wshaddix/dotnet-skills
csharp-wolverinefx
Build .NET applications with WolverineFX for messaging, HTTP services, and event sourcing. Use when implementing command handlers, message handlers, HTTP endpoints with WolverineFx.HTTP, transactional outbox patterns, event sourcing with Marten, CQRS architectures, cascading messages, batch message processing, or configuring transports like RabbitMQ, Azure Service Bus, or Amazon SQS.
374modern-csharp-coding-standards
Write modern, high-performance C# code using records, pattern matching, value objects, async/await, Span<T>/Memory<T>, and best-practice API design patterns. Emphasizes functional-style programming with C# 12+ features. Use when writing new C# code or refactoring existing code, designing public APIs for libraries or services, optimizing performance-critical code paths, or building async/await-heavy applications.
364logging-observability
Production-grade logging and observability patterns for ASP.NET Core Razor Pages. Covers structured logging with Serilog, correlation IDs, health checks, request logging, OpenTelemetry integration, and diagnostic best practices. Use when setting up structured logging in ASP.NET Core applications, implementing distributed tracing with OpenTelemetry, or configuring health checks and observability.
357testcontainers
Patterns for using Testcontainers in .NET integration tests to spin up real dependencies like databases and message queues. Use when writing integration tests that require real databases, testing with message brokers like RabbitMQ or Kafka, or isolating test dependencies with Docker containers.
357microsoft-extensions-dependency-injection
Dependency injection patterns and best practices using Microsoft.Extensions.DependencyInjection for .NET applications. Use when configuring DI containers in .NET, choosing between service lifetimes (Singleton, Scoped, Transient), or implementing decorator patterns and service interception.
354project-structure
Guidelines for organizing .NET projects, including solution structure, project references, folder conventions, .slnx format, centralized build properties, and central package management. Use when setting up a new .NET solution with modern best practices, configuring centralized build properties across multiple projects, implementing central package version management, or setting up SourceLink for debugging.
352