<udpAnnoucementEndpoint>

Artigo
02/24/2011

This configuration element defines a standard endpoint that is used by services to send announcement messages over a UDP binding. It has a fixed contract and supports two discovery versions. In addition it has a fixed UDP binding and a default address value as specified in the WS-Discovery specifications (WS-Discovery April 2005 or WS-Discovery version 1.1). You can specify the multicast address to use for sending and receiving the announcement messages.

Schema Hierarchy

<system.serviceModel>
<standardEndpoints>

Syntax

<system.serviceModel>
    <standardEndpoints>       <announcementEndpoint>           <standardEndpoint                  discoveryVersion=”WSDiscovery11/WSDiscoveryApril2005”                  maxAnnouncementDelay=”Timespan”                   multicastAddress=”Uri”                  name="String" />        </announcementEndpoint>            </standardEndpoints>
</system.serviceModel>

Attributes and Elements

The following sections describe attributes, child elements, and parent elements.

Attributes

Attribute	Description
discoveryVersion	A string that specifies one of the two versions of WS-Discovery protocol. Valid values are WSDiscovery11 and WSDiscoveryApril2005. This value is of type DiscoveryVersion.
maxAnnouncementDelay	A Timespan value that specifies the maximum value for the delay the Discovery protocol will wait before sending a Hello message. The messages will wait for a random time value between 0 and the value of this attribute before being sent. This attribute is used to set a small, random delay to prevent network storms when a network goes out and all services come back online at the same time.
multicastAddress	A URI that specifies a multicast address to use for sending and receiving the discovery messages. The default value is the multicast address as conformant to the protocol specification.
name	A String that specifies the name of the configuration of the standard endpoint. The name is used in the endpointConfiguration attribute of the service endpoint to link a standard endpoint to its configuration.

Child Elements

Element	Description
<udpTransportSettings>	A collection of settings that allow you to configure UDP transport for the UDP endpoint.

Parent Elements

Element	Description
<standardEndpoints>	A collection of standard endpoints that are pre-defined endpoints with one or more of their properties (address, binding, contract) fixed.

Example

The following example demonstrates a client listening for announcement over a UDP multicast transport with default multicast address, and UDP multicast transport with specified multicast address.

<services>
  <service name="ServiceAnnouncementListener">
      <endpoint name="udpAnnouncementEndpointStandard"
                kind="udpAnnouncementEndpoint"
                bindingConfiguration="..." />
      <endpoint name="udpAnnouncementEndpoint2"
                kind="udpAnnouncementEndpoint"
                endpointConfiguration="AnnouncementConfiguration3702"
                bindingConfiguration="..." />
...
  </service>
</services>
<standardEndpoints>
  <udpAnnouncementEndpoint>
     <standardEndpoint name="AnnouncementConfiguration2" 
          version="WSDiscoveryApril2005" 
          multicastAddress="soap.udp://239.255.255.250:3703"/>        
  </udpAnnouncementEndpoint>
</standardEndpoints>

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