ef6
Entity Framework 6 (EF6) is a mature object-relational mapper (ORM) for .NET that simplifies database interaction by eliminating boilerplate data-access code. Microsoft still supports it for security fixes, but active development has ceased in favor of the newer Entity Framework Core.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | dotnet/ef6 |
| Owner | dotnet |
| Primary language | C# |
| License | MIT — OSI-approved |
| Stars | 1.4k |
| Forks | 553 |
| Open issues | 4 |
| Latest release | v6.5.2 (2026-04-28) |
| Last updated | 2026-07-06 |
| Source | https://github.com/dotnet/ef6 |
What ef6 is
EF6 is a production-grade ORM built for .NET Framework and earlier .NET versions, providing LINQ-to-SQL query translation, lazy loading, change tracking, and visual EDMX designer support. It is no longer actively developed; security and high-impact bug fixes are provided, but new features and non-critical bug fixes are not.
Get the ef6 source
Clone the repository and explore it locally.
git clone https://github.com/dotnet/ef6.gitcd ef6# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- EF6 requires .NET Framework or legacy .NET runtime; verify target platform compatibility before adoption.
- EDMX designer and code-first workflows both supported, but code-first is generally preferred for maintainability.
- Lazy loading and circular references require careful management to avoid N+1 query problems; eager loading or explicit queries recommended.
- No async/await support in query execution; consider async wrappers or Task.Run for blocking I/O if async APIs are required.
- Connection string management and DbContext pooling differ from EF Core; review connection lifecycle in multi-threaded scenarios.
When to avoid it — and what to weigh
- Building New .NET Core / Modern .NET Applications — Entity Framework Core is the actively developed successor and is Microsoft's recommended path for new .NET projects. EF6 does not run on modern .NET platforms.
- Expecting Active Feature Development — EF6 development is frozen except for security fixes. Any new feature or architectural requirement must be met by workarounds or migration to EF Core.
- Requiring Support for Emerging Database Platforms — EF6 provider ecosystem is static. New database engines, cloud providers, or SQL dialects are unlikely to gain EF6 support; EF Core providers are actively maintained.
- Planning Long-Term Technology Investments — EF6 is in sustained support mode with a defined end-of-life. Organizations should plan migration to EF Core or alternative ORMs within the support window.
License & commercial use
MIT License. EF6 source is freely available for use, modification, and distribution under MIT terms.
MIT is a permissive, OSI-approved open-source license. Commercial use is allowed. No license fee or legal review is required for standard commercial deployment. However, consult your legal team if you modify and distribute the source code itself.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Moderate |
| Documentation | Adequate |
| License clarity | Clear |
| Deployment complexity | Low |
| DEV.co fit | Good |
| Assessment confidence | High |
EF6 security fixes are applied by Microsoft for supported versions. No known active vulnerabilities disclosed in the DATA. Standard ORM security concerns apply: validate user input before constructing queries, use parameterized queries (EF6 does this by default), and review custom SQL execution. Consider requesting a formal security audit if handling sensitive data at scale.
Alternatives to consider
Entity Framework Core (EFCore)
Microsoft's actively developed successor; required for modern .NET. Recommended migration path for any new project or greenfield work on .NET 6+.
Dapper
Lightweight micro-ORM offering minimal abstraction and high performance; suitable for read-heavy or performance-critical scenarios where EF overhead is unacceptable.
NHibernate
Alternative mature ORM for .NET with similar feature set to EF6; still actively developed and supports multiple .NET versions, but steeper learning curve.
Build on ef6 with DEV.co software developers
EF6 is production-ready and stable, but development is frozen. If you are on modern .NET, migrate to Entity Framework Core. For legacy .NET Framework applications, Devco can help architect data-access strategies and plan migrations. Contact us for a technical assessment.
Talk to DEV.coRelated open-source tools
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ef6 FAQ
Can I use EF6 with modern .NET (6, 7, 8)?
Is EF6 secure for production?
Will Microsoft continue to support EF6?
Should I migrate from EF6 to EF Core?
Software developers & web developers for hire
DEV.co helps companies turn open-source tools like ef6 into production software. Our software development services cover the full lifecycle — architecture, web development, integration, and maintenance — delivered by software developers and web developers who ship. Engage our software development agency to implement or customize it for your open-source databases stack.
Evaluating EF6 for Your .NET Project?
EF6 is production-ready and stable, but development is frozen. If you are on modern .NET, migrate to Entity Framework Core. For legacy .NET Framework applications, Devco can help architect data-access strategies and plan migrations. Contact us for a technical assessment.