How would you implement circuit breaker at system level in .NET Core?
Updated Apr 28, 2026
Short answer
A circuit breaker in .NET Core is implemented using a resilience library like Polly, and applied at the HTTP client / service communication layer to stop repeated calls to a failing dependency, prevent cascading failures, and allow automatic recovery after a cooldown period.
Deep explanation
A circuit breaker pattern is a stability pattern used in distributed systems to prevent a system from repeatedly trying to execute an operation that is likely to fail.
In .NET Core, it is typically implemented at system level (not just method level) by applying it to:
- HTTP calls (microservices communication)
- Database calls (in some cases)
- External APIs (payment gateways, SMS providers, etc.)
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🔷 Core Idea of Circuit Breaker
It has 3 states:
1. Closed State (Normal)
- Requests flow normally
- Failures are monitored
2. Open State (Blocked)…
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