- #Ef collection how to
- #Ef collection software
- #Ef collection code
- #Ef collection series
A property with the name Id or Id (e.g. A property of NET type string will, by default, map to SQL NVARCHAR(max) NULL. #Ef collection software
By Convention: When you follow simple rules on property types and names, EF Core will autoconfigure many of the software and database features.The following figure shows the process that EF Core goes through the first time you use your application’s DbContext (later instances of your DbContext use a cached version of the created Model).ĮF Core uses three ways to pick up configure information
#Ef collection how to
NOTE: I cover the whole area of how to make changes to a database in the two articles Handling Entity Framework Core migrations: creating a migration – Part 1 and Handling Entity Framework Core migrations: applying a migration – Part 2 How EF Core’s Model of the database and the actual database need to match otherwise your application will fail when it tried to access the database. Just to be clear, it never looks at the actual database to build this Model it only uses the entity classes and any EF Core configuration commands you have added. At that point is creates a Model of the database you plan to access based on your entity classes mapped to the database and any EF Core configuration commands you have provided. When I talk about “configuring EF Core”, or “configure your DbContext” I’m talking about a process the EF Core does on the first use of your application’s DbContext. Public EfCoreContext(DbContextOptions options) The following listing is a very basic application’s DbContext without any extra configuration. In this class you add DbSet properties that set up the mapping between your classes (I refer to these as entity classes) and the database. To use EF Core you must create a class that inherits EF Core’s DbContext (I refer to this as your application’s DbContext). Setting the scene – what is happening when you configure your DbContext It allows you to define you own By Convention and have it applied to all classes/properties you have defined.
There is a really helpful technique that can automate some of the configuring. When your application gets big your configuration can be split into per-class configurations, which makes it easier to find/refactor. I talk about owned types, Table-per-Hierarchy and table splitting. 
These are some more advanced entity types that are useful. If you want your database to be quick it is worth defining the SQL type a bit more tightly for certain NET types, like string, DateTime, decimal. It is especially good at configuring one-to-many relationships. Learning/following EF Core’s By Convention rules will save you a LOT of time and code. Fluent API: Finally, it runs OnModelCreating method in the application’s DbContext where you can place Fluent API commands. Attributes: It will look for certain annotations, like to add more configurations. By Convention, which applied a set of rules to the properties types/names to work out a default configuration. EF Core uses three approaches to configure your application’s DbContext. EF Core builds a Model of the database based on the DbSet classes and various configuration methods. #Ef collection code
NOTE: There is a GitHub repo at that contains all the code used in this article. I am also added a LOT of new content from my experiences of working with EF Core on client applications over the last 2½ years.
#Ef collection series
This “EF Core In depth” series is inspired by what I found while updating my book “ Entity Framework Core in Action” to cover EF Core 5. Handling Entity Framework Core migrations: applying a migration – Part 2.
Handling Entity Framework Core migrations: creating a migration – Part 1. EF Core In depth – Tips and techniques for configuring EF Core (this article). EF Core In depth – Soft deleting data with Global Query Filters. EF Core In depth – what happens when EF Core writes to the database?. EF Core In depth – what happens when EF Core reads from the database?. Here is the current list of articles in this series: This article is part of a “EF Core In depth” series. I do assume you know EF Core, but I start with a look at EF Core’s configuration of your application’s DbContext to make sure we have the basics before I dig into the various tips and techniques to make you faster and safer. This article pulls together lots of configuration approaches I have learnt working with EF Core, and EF6 before that. While configuring a DbContext is really important there can be a lot of configuration code, but over the years I have found ways to minimise or automate much of the EF Core configurations. As a working freelance developer, I’m always looking for ways to make me a more efficient/faster developer. This article is being more efficient at configuring your EF Core DbContext that runs fast and safe. Last Updated: Octo| Created: July 17, 2020
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