The document discusses building a data access layer using Entity Framework Core, outlining key components such as navigation properties, foreign keys, product models, and order detail view models. It provides code examples for defining classes and interfaces necessary for managing product and order data within a database. Additionally, it covers initializing the database with data and includes a simplified diagram of the overall structure.

1. Building the Data Access Layer
with Entity Framework Core
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2. What I Know from the Chapter
• Navigation Properties and Foreign Keys
• Adding Product Model
• The Order Detail with Product Info View Model
• Adding the IProductRepo Interface
• Adding the Product Repository
• Initializing the Database with Data
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3. Navigation Properties and Foreign Keys
• Public class blog{
Public int BlogID {get,get}
Public List<Post>Posts {get;set;}
}
Public class Post{
Public int BlogID {get;set;}
Public Blog Blog { get;set;}
}
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4. Adding Product Model
using system.Collection.Generic;
Using system.ComponentModel.DataAnnotations;
Using system.ComponentModel.DataAnnotations.Schema;
Using SpyStore.Models.Entities.Base;
Namespace SpyStore.Models.Entities{
[Table(“Products”,Schema=“Store”)]
Public class Products : EntityBase
{………………..}
[InverseProperty(name of(OrderDetail.Product))]
Public List<OrderDetail>OrderDetails{get;set;}=new List<OrderDetails>();
}
}
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5. The Order Detail with Product Info View Model
Using system.ComponentModel.DataAnnotations;
Using system.ComponentModel.DataAnnotations.Schema;
Using SpyStore.Models.Entities.Base;
Using SpyStore.Models.viewModels.Base;
Namespace Spystore.Models.ViewModels{
Public class OrderDetailWithProductInfo:ProductAndCategoryBase
{
Public int OrderID {get;set;}
[Required]
Public int Quantity {get;set;}
[DataType(DataType.Currency),Display(Name=“Total”)]
Public decimal?LineItemTotal{get;set;}
}
}
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6. Full Entity Framework Core in 1 diagram
Adding Product
Model
The Order Detail
with Product Info
View Model
Adding the
IProductRepo
Interface
Adding the
Product
Repository
Initializing the
Database with
Data
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