wcf entry (3) - Request reply mode

This article demo has been uploaded to GitHub: xinyuehtx / WCFdemo

This blog will explain how to set up call service mode of operation

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Call a WCF service has three modes: a request reply mode (Request-Repley), the one-way mode (One-Way), duplex mode (Duplex)

Request reply mode

Call service request reply mode as shown in the way, this is the default behavior of the service.

As shown we have created a service agreement IRequestResponse, and defines the methods SayHelloand they use OperationContractAttributethe default constructor to specify, indicating that this method is a request reply mode.

Then we complete the rest.

This example and the previous HelloWorld no difference.

But careful students have found that where a request reply to the reply mode?

Because our method is voida method, there is no return value.

Now we add another method SayHello2and returns a string

We are now trying to return the output value

The results shown in FIG.

This time there are a number of small partners carefully found the problem, we call the client service approach is a synchronization method.

Then the server computing and communication delay is bound to cause the client Caton

The default WCF communication time is 1min, we try to add delays in service implementation

Zaoxin good ~ ~ then the above voidmethod always all right now. We continue to experiment

This time SayHellothe voidadded delay method

Failed ++

summary

We studied the request reply mode WCF service, its features are

• simple
• The return value can be obtained
• A synchronization method, there is the risk of timeouts

Problem Solution

So for those consuming services, the emergence of a timeout problem how to solve it?

1. Try using a short service computing function, a large number of mobile computing tasks recommended to the client
2. No synchronization required for the implementation of the voidmethod, you can try单向模式
3. For non-synchronized not perform the required voidmethod, you can try异步服务

While 单向模式and 异步服务can be introduced in a later blog post

Reference links:

• Request - reply service - Microsoft Docs

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