Web Reference: Apr 25, 2023 · When the results are returned in a tracking query, EF Core checks if the entity is already in the context. If EF Core finds an existing entity, then the same instance is returned, which can potentially use less memory and be faster than a no-tracking query. May 22, 2019 · There are two steps we have taken to resolve the issue. First and foremost, if you end up in a situation where you have duplicate unique identifiers this should be resolved on the client side. Jan 16, 2026 · In this blog, we’ll demystify this error by explaining why it occurs, walk through common scenarios that trigger it, and provide step-by-step solutions to fix and prevent it. By the end, you’ll have a clear understanding of EF Core’s tracking behavior and how to avoid this issue in your applications.
YouTube Excerpt: Learn how to fix the common

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Resolving the entity type 'x' cannot be tracked Error in Entity Framework
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Resolving The instance of entity type cannot be tracked Error in Entity Framework
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Resolving the Unable to Track an Entity Issue in Entity Framework Core
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