WCF contract changes that affect clients

Question

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 W

Answer 1

Check out this article on dasBlonde: Versioning WCF Service Contracts

It lists what changes will break existing clients:

1. Remove operations
2. Change operation name
3. Remove operation parameters
4. Add operation parameters
5. Change an operation parameter name or data type
6. Change an operation's return value type
7. Change the serialized XML format for a parameter type (data contract) or operation (message contract) by explicitly using .NET attributes or custom serialization code
8. Modify service operation encoding formats (RPC Encoding vs. Document Literal)

This article by Michele explains in more detail how you can design contracts to be more flexible.