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Tag: efcore-11

2 posts

2026-09-19 migration efcore efcore-11

Migrate an EF Core Cosmos app after the generated id escaping change in EF Core 11

EF Core 11 stops escaping '/', '\', '?' and '#' in generated Cosmos DB id values, so documents written by EF Core 8-10 stop resolving by key. How to find out if you are affected, when to set the EscapeIllegalCosmosIdCharacters switch, and how to rewrite the ids safely with a transactional batch.

2026-04-14 efcore efcore-11 cosmos-db

EF Core 11 turns on Cosmos DB transactional batches by default

EF Core 11 groups Cosmos DB writes into transactional batches per container and partition on every SaveChanges, giving best-effort atomicity and fewer roundtrips without any code changes.