TAILIEUCHUNG - Lập trình .net 4.0 và visual studio 2010 part 24

WCF4 có hỗ trợ giao thức WS-Discovery cho phép phát hiện các dịch vụ trên mạng. WS-Discovery đã được phát triển như là liên doanh giữa BEA Systems, Canon, Intel, Microsoft, và WebMethods, và nổi tiếng được sử dụng trong Windows Vista để cung cấp cho người dân "gần tôi" chức năng. Để biết thêm thông tin về WS-Discovery vui lòng tham khảo phát hiện / . | CHAPTER 7 WINDOWS COMMUNICATION FOUNDATION Bridging Protocols The router service can also be used to bridge between the bindings that are used. For example on an internal trusted network you could use an unsecured connection for better performance that is then bridged to a secure connection for external communication. Redundancy You can also use the new routing functionality to define a list of backup endpoints that will be used if WCF encounters a CommunicationException or TimeoutException on the main endpoints. To define a list of backup endpoints create a new backupLists section inside the routing block like so backupLists backupList name backupList add endpointName fallover1 add endpointName fallover2 backupList backupLists WS-Discovery WCF4 contains support for the WS-Discovery protocol that allows the discovery of services on a network. WS-Discovery was originally developed as joint venture between BEA Systems Canon Intel Microsoft and WebMethods and is famously used in Windows Vista to provide the people near me functionality. For more information on WS-Discovery please refer to http ws 2004 10 discovery . WS-Discovery is a great way of easing deployment of your applications and perhaps even making them more robust by discovering alternative endpoints to use in the event of failure. WCF4 implements WS-Discovery via a new behavior called ServiceDiscoveryBehaviour that tells WCF to make a service discoverable. WCF then creates an UdpAnnouncementEndpoint to listen for discovery requests. WS-Discovery can operate in two different modes managed and adhoc. Managed Mode In managed mode a list of services is held in a central location called the discovery proxy . When services start up they inform the discovery proxy of their location. Managed mode is more complex to implement than adhoc but it creates much less network traffic and is more suitable for use in larger networks. It does however have the drawback that if your .

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