What's New in
the .NET Framework 4.0
·
Data
·
Windows Communication Foundation
·
Windows Workflow Foundation
1.Data
ADO.NET
ADO.NET
provides new features for the Entity Framework, including persistence-ignorant
objects, functions in LINQ queries, and customized object layer code
generation.
Dynamic Data
For
ASP.NET 4, Dynamic Data has been enhanced to give you even more power for
quickly building data-driven Web sites. This includes the following:
·
Automatic
validation that is based on constraints that are defined in the data model.
·
The ability to
easily change the markup that is generated for fields in the GridView
and DetailsView
controls by using field templates that are part of a Dynamic Data project.
WCF Data Services
ADO.NET
Data Service has been renamed to WCF Data Services, and has the following new
features
·
Data binding.
·
Counting entities
in an entity set.
·
Server-driven
paging.
·
Query
projections.
·
Custom data
service providers.
2. Windows
Communication Foundation
Windows
Communication Foundation (WCF) provides the following improvements:
·
Configuration-based
activation: Removes the requirement for having an .svc file.
·
System.Web.Routing
integration: Gives you more control over your service's URL by allowing the use
of extensionless URLs.
·
Multiple IIS site
bindings support: Allows you to have multiple base addresses with the same
protocol on the same Web site.
·
Routing Service:
Allows you to route messages based on content.
·
Support for
WS-Discovery: Allows you to create and search for discoverable services.
·
Standard
endpoints: Predefined endpoints that allow you to specify only certain
properties.
·
Workflow
services: Integrates WCF and WF by providing activities to send and receive
messages, the ability to correlate messages based on content, and a workflow
service host.
·
WCF REST
features:
·
Web HTTP caching:
Allows caching of Web HTTP service responses.
·
Web HTTP formats
support: Allows you to dynamically determine the best format for a service
operation to respond in.
·
Web HTTP services
help page: Provides an automatic help page for Web HTTP services, similar to
the WCF service help page.
·
Web HTTP error
handling: Allows Web HTTP Services to return error information in the same
format as the operation.
·
Web HTTP
cross-domain JavaScript support: Allows use of JSON Padding (JSONP).
·
Simplified
configuration: Reduces the amount of configuration a service requires
3. Windows
Workflow Foundation
Windows
Workflow Foundation (WF) provides improvements in the following areas:
·
Improved workflow
activity model: The Activity
class provides the base abstraction of workflow behavior.
·
Rich composite
activity options: Workflows benefit from new flow-control activities that model
traditional flow-control structures, such as Flowchart,
TryCatch,
and Switch(Of T).
·
Expanded built-in
activity library: New features of the activity library include new flow-control
activities, activities for manipulating member data, and activities for
controlling transactions.
·
Explicit activity
data model: New options for storing or moving data include variable and
directional arguments.
·
Enhanced hosting,
persistence, and tracking options: Hosting enhancements include more options
for running workflows, explicit persistence using the Persistactivity,
persisting without unloading, preventing persistence by using no-persist zones,
using ambient transactions from the host, recording tracking information to the
event log, and resuming pending workflows by using a Bookmark
object.
·
Easier ability to
extend the WF Designer: The new WF Designer is built on Windows Presentation
Foundation (WPF) and provides an easier model to use when rehosting the WF
Designer outside of Visual Studio.
