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Build Vector Search in .NET with Postgres and pgvector

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About Build Vector Search in .NET with Postgres and pgvector

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Get the source code for this video here → https://the-dotnet-weekly.kit.com/pgvector Want to master Clean Architecture? Go here: https://dub.sh/clean-architecture Want to master Modular Monoliths? Go here: https://dub.sh/modular-monolith Join the .NET Architects Club: https://www.skool.com/mj-tech-community-5418/about Get the 2026 .NET Developer roadmap here → https://the-dotnet-weekly.ck.page/2026-roadmap Postgres is more powerful than most developers realize. In this video, I’ll show you how to build semantic search in a .NET application using Postgres and the pgvector extension. We’ll use Postgres to store vector embeddings, Ollama to generate embeddings locally, and .NET Aspire to orchestrate everything. Then we’ll build a small API that can search through blog articles by meaning, not just keywords. You’ll learn how to: - Run Postgres with the pgvector extension - Generate embeddings from .NET using Ollama - Store vector embeddings in Postgres - Configure pgvector with Dapper - Create a vector index with HNSW - Implement semantic search using cosine similarity - Query your data based on meaning instead of exact text matches The best part is that you don’t need a dedicated vector database to get started. If you already use Postgres, pgvector gives you a practical way to add AI-powered search, recommendations, and RAG-style features to your applications. Source code is available in the pinned comment. Check out my courses: https://www.milanjovanovic.tech/courses Read my Blog here: https://www.milanjovanovic.tech/blog Join my weekly .NET newsletter: https://www.milanjovanovic.tech Chapters

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