Book Image

Entity Framework Tutorial

By : Joydip Kanjilal
Book Image

Entity Framework Tutorial

By: Joydip Kanjilal

Overview of this book

<p>The ADO.NET Entity Framework is a new way to build the data access layer of your Windows or web applications. It's an Object Relational Mapping (ORM) technology that makes it easy to tie together the data in your database with the objects in your applications, by abstracting the object model of an application from its relational or logical model.<br /><br />This clear and concise book gets you started with the Entity Framework and carefully gives you the skills to speed up your application development by constructing a better data access layer. It shows you how to get the most from the ADO.NET Entity Framework to perform CRUD operations with complex data in your applications.<br /><br />This tutorial starts out with the basics of the Entity Framework, showing plenty of examples to get you started using it in your own code. You will learn how to create an Entity Data Model, and then take this further with Entity types. You will also learn about the Entity Client data provider, learn how to create statements in Entity SQL, and get to grips with ADO.NET Data Services, also known as Project Astoria.</p>
Table of Contents (13 chapters)
Entity Framework Tutorial
Credits
About the Author
About the Reviewer
Preface

Serializing and De-Serializing Entity Instances


You can serialize or de-serialize an entity instance using the ObjectContext. To do this, you need to call the Serialize or the Deserialize method of the BinaryFormatter class as shown in the code snippets below:

private void Serialize(String fileName,Object obj)
{
BinaryFormatter binaryFormatter = new BinaryFormatter();
FileStream fileStream = new FileStream(fileName,FileMode.Create);
try
{
binaryFormatter.Serialize(fileStream, obj);
}
catch (SerializationException ex)
{
throw new ApplicationException("The object graph could not be serialized", ex);
}
finally
{
fileStream.Close();
}
}

The Serialize method shown above accepts a file name and the object to be serialized as parameters, serializes it using a BinaryFormatter instance, and then stores the serialized instance of the file.

Here is the DeSerialize method that accepts the name of the file where the serialized instance is stored and returns the de-serialized instance back:

public Object...