Add default Version implementation to TaskOrchestrationContext (#408)

Signed-off-by: halspang <[email protected]>

Author: halspang

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## v1.9.1 (Unreleased)
+- Add default version in `TaskOrchestrationContext` by @halspang in ([#408](https://github.com/microsoft/durabletask-dotnet/pull/408))
+
 ## v1.9.0
 
 - Fix schedule sample logging setup by @YunchuWang in ([#392](https://github.com/microsoft/durabletask-dotnet/pull/392))

src/Abstractions/TaskOrchestrationContext.cs

@@ -63,7 +63,7 @@ public abstract class TaskOrchestrationContext
     /// <summary>
     /// Gets the version of the current orchestration instance, which was set when the instance was created.
     /// </summary>
-    public abstract string Version { get; }
+    public virtual string Version => string.Empty;
 
     /// <summary>
     /// Gets the entity feature, for interacting with entities.