Entity Framework 4.1: Expert's Cookbook - download pdf or read online

By Devlin Liles

This publication takes a step by step challenge fixing technique that leads you thru an issue and explains every one step intimately to complete the target. This books delivers concrete code examples in addition to certain info at the judgements concerned. This e-book is for intermediate to complex .NET builders who've used LINQ to SQL or Entity Framework in a few shape yet are looking to have extra keep an eye on over the implementation.

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Reload()); } } } 3. Linq; namespace DataAccess { 22 Chapter 1 public interface IDbContext { DbChangeTracker ChangeTracker { get; } DbSet Set() where T : class; IQueryable Find() where T : class; DbEntityEntry Entry(T entity) where T : class; int SaveChanges(); void Rollback(); } } 4. In the DataAccess project, create a new C# interface called IUnitOfWork with the following code: using System; namespace DataAccess { public interface IUnitOfWork { void RegisterNew(T entity) where T : class; void RegisterUnchanged(T entity) where T : class; void RegisterChanged(T entity) where T : class; void RegisterDeleted(T entity) where T : class; void Refresh(); void Commit(); IDbContext Context { get; set; } } } 5.

Converting an object to a record in a table or multiple tables requires separating the data from the object and flattening it out. This process has been accomplished by many Object Relational Mappers (ORMs) through a variety of different approaches. Entity Framework approaches the problem of objects that differ greatly from the relational tables by allowing you to configure the mapping manually where it differs from the standard convention. This will reduce the amount of code that you have to write for the configuration, but it will require the learning of a new and fluent Application Programming Interface (API), which shows the database layer how to translate the code into SQL statements.

We will need to add a connection setting to the Test project to our database, and make sure that the database name is populated (the database name needs to be typed as it does not exist yet): 3. OnModelCreating(modelBuilder); } public DbSet Blogs { get; set; } } } 4. SaveChanges(); } } } 35 Improving Entity Framework in the Real World How it works... On the construction of the context, Entity Framework creates an in-memory version of the expected database model and then tries to connect to that database.

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