How Can I Avoid Duplicate Event Handlers in Serialized Objects?

Avoiding Duplicate Event Handlers: Detecting Existing Assignments

When working with serialized objects stored in session state, it's important to maintain event handlers that monitor property changes. However, adding handlers to deserialized objects can lead to duplicates due to multiple accesses. To prevent this, identifying whether an event handler has already been assigned is crucial.

Solution: Unregister-Reregister Technique

To safely ensure a handler's assignment only once, consider using the unregister-reregister technique, even if the handler is currently unassigned:

myClass.MyEvent -= MyHandler;
myClass.MyEvent += MyHandler;

Advantages of this Approach

• Guaranteed single handler registration
• Works effectively even in scenarios where you don't have complete control over handler assignments
• Eliminates the risk of multiple event invocations caused by repeated handler additions

Practical Implementation

Incorporate this technique in your code when registering your event handler to ensure its presence only once. This approach offers a clean and efficient solution to prevent duplicate handler assignments.

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