Host Configuration in Visual Studio .NET

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Listing 426 Host Configuration
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The client application must host a service using the to receive responses and con gure an endpoint to send requests to the server class that the client uses to host a serListing 427 shows the contract We added code to vice that implements the
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4: Bindings
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dynamically create the queue on which the client is listening Again, this helps simplify con guration by allowing the application to be deployed without any additional con guration in MSMQ
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Listing 427 ServiceHost Client
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Listing 428 shows the client implementation for the interface The client implements this interface, which is then used by the server as a callback to send a response on This is not using the duplex capabilities available within WCF Instead, the callback is implemented using a separate one-way binding
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Communication Using Queued Ser vice s
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Listing 428 Client
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4: Bindings
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Listing 428 continued
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The nal piece to make the stock quote sample application work is the client con guration Listing 429 shows the client con guration, which contains the information to host the service implementation, and the endpoint con guration to call the service
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Listing 429 Client Configuration
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Communication Using Queued Ser vice s
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The binding is used to communicate between a WCF application and an application that leverages MSMQ directly for This allows developers to leverage example, using WCF but still leverage their existing MSMQ applications The binding allows for MSMQ messages to be mapped to WCF messages This is facilitated by wrapping MSMQ messages in the generic class This class is located in the namespace Instances can be sent or received using oneway contracts The following code shows the addressing format for the binding:
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The MSMQ address format does not require a port to be speci ed However, MSMQ does require certain ports to be open, such as 1801 Table 412 shows the binding properties that are con gurable on the binding
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4: Bindings
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Table 412 Attribute Name Binding Properties Description Default
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The maximum time to wait for the connection to be closed The location of the per-application dead letter queue Dead letter refers to a message that has expired or failed delivery The type of dead letter queue to use The types are None, System, or Custom Speci es whether the queue is durable or volatile Speci es whether delivery supports exactly once delivery assurances The maximum size of an incoming message The number of retries before a message is considered a poison message The name of the binding The maximum time to wait for an open connection operation to complete Specify the complexity of messages that can be processed (for example, size) Speci es how poison messages are handled Valid types include Drop, Fault, Move, and Reject Maximum number of attempts to send a message before it enters the retry queue
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00:01:00 n/a
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None
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true true
65,536 2
n/a 00:01:00
Fault
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Attribute Name Description Default
The maximum time to wait for a receive operation to complete The type to wait between retry cycles Speci es the security settings of the binding The maximum time to wait for a send operation to complete Speci es the serialization for the message body The available options include XML, Binary, ActiveX, ByteArray, and Stream The length of time that messages are valid before they are expired and put into the dead-letter queue
00:10:00 00:10:00 n/a 00:01:00 Xml
100:00:00
Speci es whether MSMQ tracing false is enabled Trace messages are sent to the report queue each time a message leaves or arrives in a queue Speci es whether a copy of each message should be sent to the journal queue false
Listing 430 shows the minimal con guration to expose a service using the binding
Listing 430 Host Configuration
4: Bindings
Listing 430 continued
The minimal con guration to consume a service using the binding is shown in Listing 431
Listing 431 Client Configuration
Creating a Custom Binding
There will be times when the precon gured bindings do not meet the requirements of your service Common scenarios include custom security and additional transports, which are not supported by WCF One example is the lack of support for the UDP protocol within WCF Support for the UDP protocol exists as a sample in the Windows SDK For these situations WCF provides the capability to create custom bindings Custom bindings can be created using either code or con guration A custom binding is class found in the created in code using the namespace This class exposes a collection of binding elements that you can add binding elements to This allows you to compose a new binding based on a set of existing binding elements Listing 432 shows a custom binding being created in code