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.NET 10 introduces native multi-tenant rate limiting with improved throttling middleware. The new RateLimitPartition API enables tenant-specific rate limits using token bucket algorithms, eliminating the need for third-party libraries or manual implementation. Developers can now partition rate limiters by tenant ID extracted from request headers, preventing noisy-neighbor issues in SaaS applications. The implementation uses built-in middleware with optimized concurrency handling, replacing previous approaches that required Redis, custom counters, or IP-based limiting. This tutorial demonstrates building a multi-tenant API with per-tenant request limits using the new native capabilities.

New in .NET 10 and C# 14: Multi-Tenant Rate Limiting

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