Exam 70-487 topic 1 question 7 discussion

Actual exam question from Microsoft's 70-487

Question #: 7
Topic #: 1

You are developing a WCF service that compares several data sources. The service takes a long time to complete.
The service must meet the following requirements:
✑ The client must be able to continue processing while the service is running.
✑ The service must initiate communication with the client application when processing is complete.
You need to choose a message pattern to meet the requirements.
Which message pattern should you choose?

A. One Way
B. Streaming
C. Duplex
D. Request/Reply

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Suggested Answer: C 🗳️

by Fergus at Feb. 17, 2020, 9:08 p.m.

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Fergus

Highly Voted 5 years, 5 months ago

A duplex service contract is a message exchange pattern in which both endpoints can send messages to the other independently. A duplex service, therefore, can send messages back to the client endpoint, providing event-like behavior. Duplex communication occurs when a client connects to a service and provides the service with a channel on which the service can send messages back to the client. Note that the event-like behavior of duplex services only works within a session. https://docs.microsoft.com/en-us/dotnet/framework/wcf/feature-details/duplex-services

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