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  • Book Overview & Buying Entity Framework Core Cookbook
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Entity Framework Core Cookbook

Entity Framework Core Cookbook - Second Edition

By : Ricardo Peres
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Entity Framework Core Cookbook

Entity Framework Core Cookbook

2 (3)
By: Ricardo Peres

Overview of this book

Entity Framework is a highly recommended Object Relation Mapping tool used to build complex systems. In order to survive in this growing market, the knowledge of a framework that helps provide easy access to databases, that is, Entity Framework has become a necessity. This book will provide .NET developers with this knowledge and guide them through working efficiently with data using Entity Framework Core. You will start off by learning how to efficiently use Entity Framework in practical situations. You will gain a deep understanding of mapping properties and find out how to handle validation in Entity Framework. The book will then explain how to work with transactions and stored procedures along with improving Entity Framework using query libraries. Moving on, you will learn to improve complex query scenarios and implement transaction and concurrency control. You will then be taught to improve and develop Entity Framework in complex business scenarios. With the concluding chapter on performance and scalability, this book will get you ready to use Entity Framework proficiently.
Table of Contents (10 chapters)
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9
Index

Migrations and contexts with parameterized constructors

When using migrations we need to have public parameterless constructors or implement a factory.

Problem

If your context takes parameters in all of its public constructors, then it cannot be used by migrations, since the migrations framework does not know how to instantiate it. The error will be something like "unable to find the DbContext", which is far from helpful.

How to solve it…

The solution for this is to have a public context factory class in the same assembly as your migrations assembly. This context factory needs to implement IDbContextFactory<TContext> and return a context instance from its Create method:

public class MyContextFactory : IDbContextFactory<MyContext>
{
    public MyContext Create(DbContextFactoryOptions options)
    {
        //return a MyContext instance with its parameters
        return new MyContext("<SomeConnectionString>");
    }
}

For similar reasons, this class...

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Entity Framework Core Cookbook
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