Deep Dive into ADO.NET Data Services

AgendaService ExtensibilityCustom Object ModelOperation BatchingASP.NET AJAX client

Service ExtensibilityService OperationsQuery InterceptorsChange Interceptors

Data Model

Products Categories

Data Service

Possible Endpoints/Products/Categories

Service Operations

Data Model

Products Categories

Data Service/GetBrakes

HTTP GET/POSTGetBrakes()

Query Interceptor

Data Model

Products Categories

Data Service/Products

QueryInterceptor

HTTP GET

Change Interceptors

Data Model

Products Categories

Data Service/Products

ChangeInterceptor

HTTP POST HTTP PUT/DELETE

/Products(1)

Service Extensibility – Why?Service Operations1. Business logic2. Data shaping3. Custom endpoint

• Query Interceptor1. Data filter2. Row-level security

• Change Interceptor1. Business logic2. Logging3. Data modification

DemoService Extensibility

Custom Object ModelEDM CLR

EntityContainer Public class with IQueryable<T> properties

EntityType Public class with identity

ComplexType Public class/struct that isn’t top level

EntityKeyPublic property named “ID”, “[EntityName]ID”, or the DataServiceKey attribute

EntitySet Public IQueryable<T> property on the EntityContainer

PropertyPublic property on EntityType that returns a scalar or ComplexType value

NavigationProperty

Public property on EntityType that returns another EntityType or an IList of an EntityType

DemoCustom Object Model

Operation Batching

DataServiceContext

1) Add Entity #12) Update Entity3) Add Entity #24) Delete Entity #15) Delete Entity #2

DataService

POSTPUT

POSTDELETEDELETE

Operations:5 server hits

Without batching

Operation Batching

DataServiceContext

1) Add Entity2) Update Entity3) Add Entity #24) Delete Entity5) Delete Entity #2

DataServicePOST /$batch

Operations:1 server hit

With batching

Operation Batching

DataServiceContext

1) Get Entity #12) Get Entity #23) Get Entity #3

DataService

Operations:3 server hits

Without batching

GETGETGET

Operation Batching

DataServiceContext

1) Get Entity #12) Get Entity #23) Get Entity #3

DataService

Operations:1 server hit

With batching

GET /$batch

DemoOperation Batching

ASP.NET AJAX Client

DataServiceHTTP

DataModel

Sys.Data.DataService

JSON

ServerClient

ASP.NET AJAX ClientSys.Data.ActionSequenceSys.Data.DataServiceSys.Data.QueryBuilder

DemoASP.NET AJAX Client

SummaryService ExtensibilityQuery BatchingCustom Object ModelASP.NET AJAX client