Wcf service contract versioning

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It only takes a minute to sign up. I know two ways to avoid this:. It depends on many things such as what changes you are going to make, what platform your clients are built on, what's your change tracking policy, etc. For example if you just want to add a new property to a data contract or a new operation to a service contract it's safe to add it to your current implementation as long as the clients are version tolerant DataContractSerializer is version tolerant and it complies with your change tracking policy.

However you would better stick to strict versioning strategy which requires creating a new contract and exposing it with a new endpoint in case the changes are more serious. This should help you to choose the right version strategy and provide your with the best practices to follow. Sign up to join this community. The best answers are voted up and rise to the top. Asked 6 years, 3 months ago. Active 6 years, 3 months ago.

wcf service contract versioning

Viewed 8k times. I know two ways to avoid this: publish the web service with the new contract in another server create a new file svc with the new contract there are other ways? Improve this question. Guerra Guerra 43 1 1 silver badge 4 4 bronze badges. Sharing your research helps everyone. Hi gnat. I've edit my question, I hope it is clearer.

Active Oldest Votes. I suggested reading these articles: Versioning Strategies Best Practices: Data Contract Versioning This should help you to choose the right version strategy and provide your with the best practices to follow. Improve this answer.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I was curious if someone could outline which types of WCF contract interface changes on the server side would break a client trying to send in a message, and why. I believe WCF can handle certain discrepancies, but I'm not sure exactly what you can change safely, and what you can't.

EDIT: As John Saunders pointed out, changing the contract is not usually a good idea, but there are things built in that allow for some version tolerance ExtensionDataObject, etc.? I would just like to know how flexible the version tolerance is.

This article by Michele explains in more detail how you can design contracts to be more flexible. Carefully choose names for all contracts interfaces, methods, classes and properties.

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These will be hard to change in future versions. In particular, adding new parameters to an operation contract will cause legacy clients not to pass them, and on the service side they will be set with their default values. Moreover, removing parameters from an operation contract, will be silent from the client point of view, and they will be simply ignored on the service side.

I think the best practice is to think of contracts as unbreakable, hmmm, contracts. Don't change them once they're published. It's easy enough to create a new contract with the changes you want, and to expose the new contract on a new endpoint.

Due to wrong naming syntax parameter is specified with capital letterI would like to adjust some code:. Learn more. WCF contract changes that affect clients Ask Question.

Asked 11 years, 10 months ago. Active 4 years, 4 months ago. Viewed 12k times. Improve this question. Andy White Andy White Active Oldest Votes. Check out this article on dasBlonde: Versioning WCF Service Contracts It lists what changes will break existing clients: Remove operations Change operation name Remove operation parameters Add operation parameters Change an operation parameter name or data type Change an operation's return value type Change the serialized XML format for a parameter type data contract or operation message contract by explicitly using.

Document Literal This article by Michele explains in more detail how you can design contracts to be more flexible. Improve this answer. Benjamin W. Jonathan Parker Jonathan Parker 6, 3 3 gold badges 38 38 silver badges 53 53 bronze badges.

If you need to do one of these things, update your clients. It's easy with VS Would making a non-nullable Guid contract property to be Nullable break the clients? Design recommendations for contracts First version 1. Next version 2. Any deletion breaks compatibility. Any other change breaks compatibility. Daniele Giallonardo Daniele Giallonardo 73 3 3 bronze badges. John Saunders John Saunders k 23 23 gold badges silver badges bronze badges.

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I agree with the overall concept of not changing contracts, but if you make small changes to a contract, I don't know if it's always a good idea to publish a new endpoint for every new contract.

Any thoughts on this?In a WCF Service, I must modify the existing operation contracts with new parameters, and new methods. For interoperability reasons, The service must publish a single Wsdl. To this reason, I use a Flat behaviour FlatWsld. If I don't define the Namespace into the Service implementation, the Wsdl file isn't flat with a single interface. I define two endpoints service for each service interface. In each endpoint, I define the NameSpace.

I wish apply a strict-versioning policy, any change to an operation leads to a new service contract. A new endpoint is always provided to ensure version 2 clients can be differentiated from version 1 clients.

I read all documentation from Msdn and blogs. With a single Interface the Wsdl published are flat, but I need update the interface service with a new contract, for this purpose i define a new interface with a new namespace.

On this scenario, the published Wsdl aren't flat because each interface and each endpoint had a namespace. I need versioning a existing service.

WCF Versioning

If I implement separate service corresponding to each interface then I have separated service with separate name and addresses. The content you requested has been removed. Ask a question. Quick access. Search related threads.

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Remove From My Forums. Asked by:. Archived Forums. Windows Communication Foundation, Serialization, and Networking. Sign in to vote. Thursday, May 3, PM. GeneratedXmlSchemas; foreach ServiceDescription wsdl in exporter.

Service Versioning

Schemas import. Includes[i] is XmlSchemaImport schema. Friday, May 4, AM. I am not sure why you are having two interface in single service?

Monday, May 7, AM.After initial deployment, and potentially several times during their lifetime, services and the endpoints they expose may need to be changed for a variety of reasons, such as changing business needs, information technology requirements, or to address other issues. Each change introduces a new version of the service. Contract changes: For example, an operation might be added, or a data element in a message might be added or changed.

Address changes: For example, a service moves to a different location where endpoints have new addresses. Some of these changes are called "breaking" and others are "nonbreaking. Any change that does not meet that criterion is a breaking change. One of the tenets of service orientation is that services and clients are autonomous or independent.

Among other things, this implies that service developers cannot assume that they control or even know about all service clients. This eliminates the option of rebuilding and redeploying all clients when a service changes versions. This topic assumes the service adheres to this tenet and therefore must be changed or "versioned" independent of its clients. In cases where a breaking change is unexpected and cannot be avoided, an application may choose to ignore this tenet and require that clients be rebuilt and redeployed with a new version of the service.

Contracts used by a client do not need to be the same as the contract used by the service; they need only to be compatible. For service contracts, compatibility means new operations exposed by the service can be added but existing operations cannot be removed or changed semantically. For data contracts, compatibility means new schema type definitions can be added but existing schema type definitions cannot be changed in breaking ways.

Breaking changes might include removing data members or changing their data type incompatibly. This feature allows the service some latitude in changing the version of its contracts without breaking clients. The next two sections explain nonbreaking and breaking changes that can be made to WCF data and service contracts. In many scenarios when changing versions is an issue, the service developer does not have control over the clients and therefore cannot make assumptions about how they would react to changes in the message XML or schema.

In these cases, you must guarantee that the new messages will validate against the old schema, for two reasons:. The old clients were developed with the assumption that the schema will not change.

wcf service contract versioning

They may fail to process messages that they were never designed for. The old clients may perform actual schema validation against the old schema before even attempting to process the messages.In this article, I will explore the versioning strategies supported by the WCF framework in different cases.

If you have gone through the previous two articles, it is understood that WCF is version tolerant. Version tolerance is acceptable in case of new operations, or adding and removing operation parameters. But at the same time, it should be avoidable when a breaking change is introduced in the service, such as removing operations from a service contract, or adding or removing required members from a data contract. Keeping all those scenarios in mind, a service architect should adopt a proper versioning strategy, which will keep pace with agility, productivity, and change control.

This kind of versioning is based on the version tolerant behavior of the WCF framework. This versioning approach fully relies on backward compatibility for as long as possible and avoids formal contract and endpoint versioning until compatibility is broken.

In the agile approach to versioning, we make changes to existing data contracts and service contracts without versioning them, or supplying new endpoints.

The following figure shows the agile versioning approach:. This approach is useful in agile environments that require frequent updates to production code. Once you are done with the development of the WCF service, build the service. Here you can observe the WCF framework has provided the default versioning specification for the service.

By default, the name of a service contract is the name of the interface. For this we need to add attributes as follows:. Now, build the service and again view the WSDL and you can see your own versioning specification:. Once you click on OKthe stub code will be generated. Note: When a new versioning specification is implemented at the service end and the service reference is not updated, the consumer client becomes incompatible due to the mismatch in the above mentioned section of the stub code.

Say, the above developed service has been deployed in production and the client applications which have consumed the service are working fine.

Now, after a few days, one of the clients raises a request to update and display the employee address in its application. Also, it wants a new functionality for retrieving data by EmpID. The Data Contracts at the service end are required to be modified in order to include the employee address.

Also, we need to introduce a new method for fetching the employee details by ID at the service end. At the same time, we are required to maintain compatibility for other clients.Services should be decoupled as much as possible from their clients, especially when it comes to versioning and technologies.

Any version of the client should be able to consume any version of the service, and should do so without resorting to version numbers, such as those in assemblies, because those are.

When a service and a client share a data contract, an important objective is allowing the service and client to evolve their versions of the data contract separately. To allow such decoupling, WCF needs to enable both backward and forward compatibility, without even sharing types or version information.

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There are three main versioning scenarios:. Round tripping, where a new version is passed to and from an old version, requiring both backward and forward compatibility. The most common change done with data contracts is adding new members on one side and sending the new contract to an old client or service. The new members will simply be ignored by DataContractSerializer when deserializing the type. As a result, both the service and the client can accept data with new members that were not part of original contract.

For example, the service may be built against this data contract:. Skip to main content. Start your free trial.

wcf service contract versioning

New members Missing members Round tripping, where a new version is passed to and from an old version, requiring both backward and forward compatibility. New Members.This topic lists the best practices for creating data contracts that can evolve easily over time. For more information about data contracts, see the topics in Using Data Contracts. In discussing data contract versioning, it is important to note that the data contract schema exported by Windows Communication Foundation WCF does not have any versioning support, other than the fact that elements are marked as optional by default.

This means that even the most common versioning scenario, such as adding a new data member, cannot be implemented in a way that is seamless with regard to a given schema. The newer versions of a data contract with a new data member, for example do not validate using the old schema.

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However, there are many scenarios in which strict schema compliance is not required. NET, do not perform schema validation by default and therefore tolerate extra elements that are not described by the schema. When working with such platforms, many versioning scenarios are easier to implement. Thus, there are two sets of data contract versioning guidelines: one set for scenarios where strict schema validity is important, and another set for scenarios when it is not.

If strict schema validity is required in all directions new-to-old and old-to-newdata contracts should be considered immutable. If versioning is required, a new data contract should be created, with a different name or namespace, and the service contract using the data type should be versioned accordingly.

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For example, a purchase order processing service contract named PoProcessing with a PostPurchaseOrder operation takes a parameter that conforms to a PurchaseOrder data contract. If the PurchaseOrder contract has to change, you must create a new data contract, that is, PurchaseOrder2which includes the changes. You must then handle the versioning at the service contract level.

For example, by creating a PostPurchaseOrder2 operation that takes the PurchaseOrder2 parameter, or by creating a PoProcessing2 service contract where the PostPurchaseOrder operation takes a PurchaseOrder2 data contract. Note that changes in data contracts that are referenced by other data contracts also extend to the service model layer.

For example, in the previous scenario the PurchaseOrder data contract does not need to change. However, it contains a data member of a Customer data contract, which in turn contained a data member of the Address data contract, which does need to be changed. In that case, you would need to create an Address2 data contract with the required changes, a Customer2 data contract that contains the Address2 data member, and a PurchaseOrder2 data contract that contains a Customer2 data member.

As in the previous case, the service contract would have to be versioned as well. Although in these examples names are changed by appending a "2"the recommendation is to change namespaces instead of names by appending new namespaces with a version number or a date.

For more information, see Best Practices: Service Versioning. Occasionally, you must guarantee strict schema compliance for messages sent by your application, but cannot rely on the incoming messages to be strictly schema-compliant. In this case, there is a danger that an incoming message might contain extraneous data.

The extraneous values are stored and returned by WCF and thus results in schema-invalid messages being sent. To avoid this problem, the round-tripping feature should be turned off. There are two ways to do this. Do not implement the IExtensibleDataObject interface on any of your types. For more information about round-tripping, see Forward-Compatible Data Contracts. Strict schema compliance is rarely required.