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However, a relational database will apply its own validation, such as checking that a unique index constraint hasn’t been violated, and will throw an exception if any constraint is breached.The problem with database exception messages is that they aren’t user-friendly, and can reveal something about your database structure (which is a possible security breach), so you can’t show them directly to the user.The example I showed is simple, but the possibilities are endless. The feature is new in EF Core, and is not available in EF6.x. While I have used DD, it does require me to add a command at the end of every query. But, like all powerful features, it is best to understand what is going on so that you can use it in the right way.This means that I have to add extra stages in my query if I want to use methods such as string. Firstly, the obvious thing is the method you provide is run on every entity (row) you read from the database.
Now I want to list a book, with its primary key, title and the Author(s) as a comma delimited string.The feature gives you as a developer the ability to create complex queries, and EF Core will optimize the query to run as much it can on the database Server.