[Breaking change]: WCF Client RC 6.0 RC Release

[HongGit]

Description

WCF Client 6.0 RC Release.

Previously when using Duplex contract, failure to capture synchronization context on channel factory open. The behavior now matches .NET framework, by default, we will now capture the synchronization context, and will dispatch callbacks to the captured context. To revert to 4.x behavior, apply the CallbackBehaviorAttribute with the UseSynchronizationContext property set to false.

Version

Other (please put exact version in description textbox)

Previous behavior

Previously when using Duplex contract, failure to capture synchronization context on channel factory open.

New behavior

The behavior now matches .NET framework, by default, we will now capture the synchronization context, and will dispatch callbacks to the captured context.

Type of breaking change

• Binary incompatible: Existing binaries may encounter a breaking change in behavior, such as failure to load or execute, and if so, require recompilation.
• Source incompatible: When recompiled using the new SDK or component or to target the new runtime, existing source code may require source changes to compile successfully.
• Behavioral change: Existing binaries may behave differently at run time.

Reason for change

Bug fix PR . The new behavior now matches .NET framework.

Recommended action

To revert to 4.x behavior, apply the CallbackBehaviorAttribute with the UseSynchronizationContext property set to false.

Feature area

WCF Client

Affected APIs

DuplexChannelFactory<TChannel>.Open
DuplexChannelFactory<TChannel>.BeginOpen/EndOpen

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Associated WorkItem - 86272