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Wcf Binaryencoded Message Inspector For Fiddler For Mac

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This sample demonstrates how to implement and configure client and service message inspectors.

A message inspector is an extensibility object that can be used in the service model's client runtime and dispatch runtime programmatically or through configuration and that can inspect and alter messages after they are received or before they are sent.

This sample implements a basic client and service message validation mechanism that validates incoming messages against a set of configurable XML Schema documents. Note that this sample does not validate messages for each operation. This is an intentional simplification.

Message Inspector

Client message inspectors implement the IClientMessageInspector interface and service message inspectors implement the IDispatchMessageInspector interface. The implementations can be combined into a single class to form a message inspector that works for both sides. This sample implements such a combined message inspector. The inspector is constructed passing in a set of schemas against which incoming and outgoing messages are validated and allows the developer to specify whether incoming or outgoing messages are validated and whether the inspector is in dispatch or client mode, which affects the error handling as discussed later in this topic.

Any service (dispatcher) message inspector must implement the two IDispatchMessageInspector methods AfterReceiveRequest and BeforeSendReply(Message, Object).

AfterReceiveRequest is invoked by the dispatcher when a message has been received, processed by the channel stack and assigned to a service, but before it is deserialized and dispatched to an operation. If the incoming message was encrypted, the message is already decrypted when it reaches the message inspector. The method gets the request message passed as a reference parameter, which allows the message to be inspected, manipulated or replaced as required. The return value can be any object and is used as a correlation state object that is passed to BeforeSendReply when the service returns a reply to the current message. In this sample, AfterReceiveRequest delegates the inspection (validation) of the message to the private, local method ValidateMessageBody and returns no correlation state object. This method ensures that no invalid messages pass into the service.

BeforeSendReply(Message, Object) is invoked whenever a reply is ready to be sent back to a client, or in the case of one-way messages, when the incoming message has been processed. This allows extensions to count on being called symmetrically, regardless of MEP. As with AfterReceiveRequest, the message is passed as a reference parameter and can be inspected, modified or replaced. The validation of the message that is performed in this sample is again delegated to the ValidMessageBody method, but the handling of validation errors is slightly different in this case.

If a validation error occurs on the service, the ValidateMessageBody method throws FaultException-derived exceptions. In AfterReceiveRequest, these exceptions can be put into the service model infrastructure where they are automatically transformed into SOAP faults and relayed to the client. In BeforeSendReply, FaultException exceptions must not be put into the infrastructure, because the transformation of fault exceptions thrown by the service occurs before the message inspector is called. Therefore the following implementation catches the known ReplyValidationFault exception and replaces the reply message with an explicit fault message. This method ensures that no invalid messages are returned by the service implementation.

The client message inspector is very similar. The two methods that must be implemented from IClientMessageInspector are AfterReceiveReply and BeforeSendRequest.

BeforeSendRequest is invoked when the message has been composed either by the client application or by the operation formatter. As with the dispatcher message inspectors, the message can just be inspected or entirely replaced. In this sample, the inspector delegates to the same local ValidateMessageBody helper method that is also used for the dispatch message inspectors.

The behavioral difference between the client and service validation (as specified in the constructor) is that the client validation throws local exceptions that are put into the user code because they occur locally and not because of a service failure. Generally, the rule is that service dispatcher inspectors throw faults and that client inspectors throw exceptions.

This BeforeSendRequest implementation ensures that no invalid messages are sent to the service.

The AfterReceiveReply implementation ensures that no invalid messages received from the service are relayed to the client user code.

The heart of this particular message inspector is the ValidateMessageBody method. To perform its work, it wraps a validating XmlReader around the body content sub-tree of the passed message. The reader is populated with the set of schemas that the message inspector holds and the validation callback is set to a delegate referring to the InspectionValidationHandler that is defined alongside this method. To perform the validation, the message is then read and spooled into a memory stream-backed XmlDictionaryWriter. If a validation error or warning occurs in the process, the callback method is invoked.

If no error occurs, a new message is constructed that copies the properties and headers from the original message and uses the now-validated infoset in the memory stream, which is wrapped by an XmlDictionaryReader and added to the replacement message.

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The InspectionValidationHandler method is called by the validating XmlReader whenever a schema validation error or warning occurs. The following implementation only works with errors and ignores all warnings.

On first consideration, it might seem possible to inject a validating XmlReader into the message with the message inspector and let the validation happen as the message is processed and without buffering the message. That, however, means that this callback throws the validation exceptions somewhere into the service model infrastructure or the user code as invalid XML nodes are detected, resulting in unpredictable behavior. The buffering approach shields the user code from invalid messages, entirely.

As previously discussed, the exceptions thrown by the handler differ between the client and the service. On the service, the exceptions are derived from FaultException, on the client the exceptions are regular custom exceptions.

Behavior

Message inspectors are extensions to the client runtime or the dispatch runtime. Such extensions are configured using behaviors. A behavior is a class that changes the behavior of the service model runtime by changing the default configuration or adding extensions (such as message inspectors) to it.

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The following SchemaValidationBehavior class is the behavior used to add this sample's message inspector to the client or dispatch runtime. The implementation is rather basic in both cases. In ApplyClientBehavior and ApplyDispatchBehavior, the message inspector is created and added to the MessageInspectors collection of the respective runtime.

Note

This particular behavior does not double as an attribute and therefore cannot be added declaratively onto a contract type of a service type. This is a by-design decision made because the schema collection cannot be loaded in an attribute declaration and referring to an extra configuration location (for instance to the application settings) in this attribute means creating a configuration element that is not consistent with the rest of the service model configuration. Therefore, this behavior can only be added imperatively through code and through a service model configuration extension.

Adding the Message Inspector through Configuration

For configuring a custom behavior on an endpoint in the application configuration file, the service model requires implementers to create a configuration extension element represented by a class derived from BehaviorExtensionElement. This extension must then be added to the service model's configuration section for extensions as shown for the following extension discussed in this section.

Extensions can be added in the application or ASP.NET configuration file, which is the most common choice, or in the machine configuration file.

When the extension is added to a configuration scope, the behavior can be added to a behavior configuration as it is shown in the following code. Behavior configurations are reusable elements that can be applied to multiple endpoints as required. Because the particular behavior to be configured here implements IEndpointBehavior, it is only valid in the respective configuration section in the configuration file.

The element that configures the message inspector is backed by the SchemaValidationBehaviorExtensionElement class. The class exposes two Boolean public properties named ValidateRequest and ValidateReply. Both of these are marked with a ConfigurationPropertyAttribute. This attribute constitutes the link between the code properties and the XML attributes that can be seen on the preceding XML configuration element. The class also has a property Schemas that is additionally marked with the ConfigurationCollectionAttribute and is of the type SchemaCollection, which is also part of this sample but omitted from this document for brevity. This property along with the collection and the collection element class SchemaConfigElement backs the element in the preceding configuration snippet and allows adding a collection of schemas to the validation set.

The overridden CreateBehavior method turns the configuration data into a behavior object when the runtime evaluates the configuration data as it builds a client or an endpoint.

Adding Message Inspectors Imperatively

Except through attributes (which is not supported in this sample for the reason cited previously) and configuration, behaviors can quite easily be added to a client and service runtime using imperative code. In this sample, this is done in the client application to test the client message inspector. The GenericClient class is derived from ClientBase, which exposes the endpoint configuration to the user code. Before the client is implicitly opened the endpoint configuration can be changed, for instance by adding behaviors as shown in the following code. Adding the behavior on the service is largely equivalent to the client technique shown here and must be performed before the service host is opened.

To set up, build, and run the sample

  1. Ensure that you have performed the One-Time Setup Procedure for the Windows Communication Foundation Samples.

  2. To build the solution, follow the instructions in Building the Windows Communication Foundation Samples.

  3. To run the sample in a single- or cross-machine configuration, follow the instructions in Running the Windows Communication Foundation Samples.

Important

Loop software for water supply design free download. The samples may already be installed on your machine. Check for the following (default) directory before continuing.

:WF_WCF_Samples

If this directory does not exist, go to Windows Communication Foundation (WCF) and Windows Workflow Foundation (WF) Samples for .NET Framework 4 to download all Windows Communication Foundation (WCF) and WF samples. This sample is located in the following directory.

Wcf Binaryencoded Message Inspector For Fiddler For Mac Os

Message
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The InspectionValidationHandler method is called by the validating XmlReader whenever a schema validation error or warning occurs. The following implementation only works with errors and ignores all warnings.

On first consideration, it might seem possible to inject a validating XmlReader into the message with the message inspector and let the validation happen as the message is processed and without buffering the message. That, however, means that this callback throws the validation exceptions somewhere into the service model infrastructure or the user code as invalid XML nodes are detected, resulting in unpredictable behavior. The buffering approach shields the user code from invalid messages, entirely.

As previously discussed, the exceptions thrown by the handler differ between the client and the service. On the service, the exceptions are derived from FaultException, on the client the exceptions are regular custom exceptions.

Behavior

Message inspectors are extensions to the client runtime or the dispatch runtime. Such extensions are configured using behaviors. A behavior is a class that changes the behavior of the service model runtime by changing the default configuration or adding extensions (such as message inspectors) to it.

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The following SchemaValidationBehavior class is the behavior used to add this sample's message inspector to the client or dispatch runtime. The implementation is rather basic in both cases. In ApplyClientBehavior and ApplyDispatchBehavior, the message inspector is created and added to the MessageInspectors collection of the respective runtime.

Note

This particular behavior does not double as an attribute and therefore cannot be added declaratively onto a contract type of a service type. This is a by-design decision made because the schema collection cannot be loaded in an attribute declaration and referring to an extra configuration location (for instance to the application settings) in this attribute means creating a configuration element that is not consistent with the rest of the service model configuration. Therefore, this behavior can only be added imperatively through code and through a service model configuration extension.

Adding the Message Inspector through Configuration

For configuring a custom behavior on an endpoint in the application configuration file, the service model requires implementers to create a configuration extension element represented by a class derived from BehaviorExtensionElement. This extension must then be added to the service model's configuration section for extensions as shown for the following extension discussed in this section.

Extensions can be added in the application or ASP.NET configuration file, which is the most common choice, or in the machine configuration file.

When the extension is added to a configuration scope, the behavior can be added to a behavior configuration as it is shown in the following code. Behavior configurations are reusable elements that can be applied to multiple endpoints as required. Because the particular behavior to be configured here implements IEndpointBehavior, it is only valid in the respective configuration section in the configuration file.

The element that configures the message inspector is backed by the SchemaValidationBehaviorExtensionElement class. The class exposes two Boolean public properties named ValidateRequest and ValidateReply. Both of these are marked with a ConfigurationPropertyAttribute. This attribute constitutes the link between the code properties and the XML attributes that can be seen on the preceding XML configuration element. The class also has a property Schemas that is additionally marked with the ConfigurationCollectionAttribute and is of the type SchemaCollection, which is also part of this sample but omitted from this document for brevity. This property along with the collection and the collection element class SchemaConfigElement backs the element in the preceding configuration snippet and allows adding a collection of schemas to the validation set.

The overridden CreateBehavior method turns the configuration data into a behavior object when the runtime evaluates the configuration data as it builds a client or an endpoint.

Adding Message Inspectors Imperatively

Except through attributes (which is not supported in this sample for the reason cited previously) and configuration, behaviors can quite easily be added to a client and service runtime using imperative code. In this sample, this is done in the client application to test the client message inspector. The GenericClient class is derived from ClientBase, which exposes the endpoint configuration to the user code. Before the client is implicitly opened the endpoint configuration can be changed, for instance by adding behaviors as shown in the following code. Adding the behavior on the service is largely equivalent to the client technique shown here and must be performed before the service host is opened.

To set up, build, and run the sample

  1. Ensure that you have performed the One-Time Setup Procedure for the Windows Communication Foundation Samples.

  2. To build the solution, follow the instructions in Building the Windows Communication Foundation Samples.

  3. To run the sample in a single- or cross-machine configuration, follow the instructions in Running the Windows Communication Foundation Samples.

Important

Loop software for water supply design free download. The samples may already be installed on your machine. Check for the following (default) directory before continuing.

:WF_WCF_Samples

If this directory does not exist, go to Windows Communication Foundation (WCF) and Windows Workflow Foundation (WF) Samples for .NET Framework 4 to download all Windows Communication Foundation (WCF) and WF samples. This sample is located in the following directory.

Wcf Binaryencoded Message Inspector For Fiddler For Mac Os

:WF_WCF_SamplesWCFExtensibilityMessageInspectors

Date Published: 19 December 2009

Wcf Binaryencoded Message Inspector For Fiddler For Mac Osx

If you're doing any work with WCF (and perhaps Silverlight, for example, but any client will do) and you'd like to maximize the performance of your messages, you're probably using binary encoding as it's much less verbose than other options. However, this makes tools like Fiddler much less useful when it comes to debugging why the thing isn't doing what you thought it was doing, because by default Fiddler doesn't have a useful view of such messages.

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Well, look no further. There is a WCF Binary-encoded Message Inspector for Fiddler which solves this need. It's free and hosted on code.msdn.microsoft.com. You can read more about it on the Functional Fun blog.

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Wcf Binaryencoded Message Inspector For Fiddler For Mac Download

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Wcf Binaryencoded Message Inspector For Fiddler For Mac Catalina

Steve is an experienced software architect and trainer, focusing on code quality and Domain-Driven Design with .NET.





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