.NET Tips and Tricks

Blog archive

Defining Natural Keys in Entity Framework Entity Classes

It's not something database developers do much anymore, but it is possible to have a primary key in a table that isn't generated by the database. If you do have a key like that, here's what you have to do: when writing an entity class in Entity Framework, you need to tell Entity Framework about it by flagging the corresponding property in the entity class. You do that by decorating the property with the DatabaseGenerated attribute and specifying a DatabaseGeneratedOption.

For a key not generated by the database, the option to pick is DatabaseGeneratedOption.None, like this:

 Public  Class SalesOrder
<Key(), DatabaseGenerated(DatabaseGeneratedOption.None)> Public Property SalesOrderId As Integer

Posted by Peter Vogel on 05/19/2014 at 12:32 PM


comments powered by Disqus

Featured

  • Python in VS Code Adds Data Viewer for Debugging

    The January 2021 update to the Python Extension for Visual Studio Code is out with a short list of new features headed by a data viewer used while debugging.

  • GitHub Ships Enterprise Server 3.0 Release Candidate

    It's described as "the biggest ever change to Enterprise Server," with improvements to Actions, Packages, mobile, security and more.

  • Attacks on .NET Apps Grow in Number, Severity, Says Security Firm

    .NET apps were found to have more serious vulnerabilities and suffer more attacks last year, according to data gathered by Contrast Labs.

  • Microsoft Opens Up Old Win32 APIs to C# and Rust, More Languages to Come

    Microsoft is opening up old Win32 APIs long used for 32-bit Windows programming, letting coders use languages of their choice instead of the default C/C++ option.

Upcoming Events