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POSilverlight WP7 messaging, should I use a WeakReference and if so how?
 

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  1. POSilverlight WP7 messaging, should I use a WeakReference and if so how?
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    <p>I'm creating a simple messaging system for a windows phone silverlight app.</p> <p>The idea is various xaml pages &amp; other objects will subscribe to a messaging object, passing in the type of message they want to recieve/handle and an Action&lt;> Delegate as the handler.</p> <p>When an action happens a message (with payload) will be sent to the correct subscribers.</p> <p>Here's a quick draft of what I want as the message class.</p> <pre><code>public class MessageBus { private List&lt;Subscriber&gt; subscribers; public MessageBus() { subscribers = new List&lt;Subscriber&gt;(); } public void Subscribe(string messageType, Action&lt;object&gt;subscriber){ subscribers.Add(new Subscriber(messageType, subscriber)); } public void SendMessage(object message, string messageType) { foreach (Subscriber subscriber in subscribers) { if (subscriber.MessageType == messageType &amp;&amp; subscriber.Reciever != null) { subscriber.Reciever(message); } } } } public class Subscriber { public string MessageType { get; set; } public Action&lt;object&gt; Reciever { get; set; } public Subscriber(string messageType, Action&lt;Object&gt; reciever) { MessageType = messageType; Reciever = reciever; } } </code></pre> <p>So varius subscribers will add themselves with a type, Action. As I understand this will stop the original pages/objects from being garbage collected (I assume it would be otherwise?) because a reference to it will always exist.</p> <p>I can't really unsubscribe, or not always anyway and the messaging queue will stay around for the lifetime of the application.</p> <p>Should I implement WeakReferences and if so how?</p> <p>Would WeakReferences add more overhead?</p> <p>Am I crazy to even consider this because the memory in use will be tiny?</p>
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    1. COSounds like you should subscribe to these messages in each page's OnNavigatedTo and unsubscribe again on OnNavigatedFrom. Much simpler!
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