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How to guarantee idempotent message processing with EF Core 11 when two app instances consume the same message

startdebugging.net · published 20 September 2026

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https://learn.microsoft.com/en-us/ef/core/what-is-new/

learn.microsoft.com

https://learn.microsoft.com/en-us/azure/architecture/patterns/idempotent-consumer

learn.microsoft.com

https://masstransit.massient.com/documentation/configuration/middleware/outbox

masstransit.massient.com

https://learn.microsoft.com/en-us/ef/core/saving/transactions

learn.microsoft.com

https://www.postgresql.org/docs/18/index-unique-checks.html

postgresql.org

https://learn.microsoft.com/en-us/previous-versions/SQL/SQL-server-2008/ms151779(v=sql.100

learn.microsoft.com

Fix: The configured execution strategy 'SqlServerRetryingExecutionStrategy' does not support user-initiated transactions Read at the source ↗

startdebugging.net

Fix: 23505: duplicate key value violates unique constraint on a concurrent EF Core insert Read at the source ↗

startdebugging.net

How to implement optimistic concurrency with a rowversion token in EF Core 11 Read at the source ↗

startdebugging.net

How to use pessimistic locking with UPDLOCK and SELECT ... FOR UPDATE in EF Core 11 Read at the source ↗

startdebugging.net

BackgroundService vs IHostedService vs Hangfire for background jobs in .NET 11 Read at the source ↗

startdebugging.net

https://learn.microsoft.com/en-us/ef/core/what-is-new/ef-core-11.0/whatsnew

learn.microsoft.com

https://github.com/MassTransit/MassTransit/blob/develop/src/Persistence/MassTransit.EntityFrameworkCoreIntegration/EntityFrameworkCoreIntegration/InboxState.cs

github.com