event-handling

Is the implementation below thread-safe? If not what am I missing? Should I have the volatile keywords somewhere? Or a lock somewhere in the OnProcessingCompleted method? If so, where? public abstract class ProcessBase : IProcess { private readonly object completedEventLock = new object(); private event EventHandler<ProcessCompletedEventArgs> ProcessCompleted; event EventHandler<ProcessCompletedEventArgs> IProcess.ProcessCompleted { add { lock (completedEventLock) ProcessCompleted += value; } remove { lock (completedEventLock) ProcessCompleted -= value; } } protected void OnProcessingCompleted

I've been trying to learn about events/delegates, but am confused about the relationship between the two. I know that delegates allow you to invoke different functions without needing to know what particular function is being invoked. (eg: a graphing function needs to accept inputs that are different functions to be graphed). But I don't see how delegates are used in Events. Can someone construct a simple example (in pseudocode or C# or Java) that illustrates the workings of Delegates as related to Events? Thanks! (This is all from a C# perspective.) I have an article about the differences

use - C# (.Net Framework 4.5, Visual Studio 2012) I try to understand such theme like Delegate, and currently I have few points, that must be clarified for me. I found a lot of different information in internet that describe how to use it, but it's a little bit complicated to understanding for me this theme. As I understand I must to do few thing for using delegate: Create some entity for work with it (that require creating some delegate) Declare a delegate type Create some method where I call to delegate In main class call delegate with required method that use entity (from first point) all

I have the following class, which has one public event called LengthChanged : class Dimension { public int Length { get { return this.length; } set { if (this.length != value) { this.length = value; this.OnLengthChanged (); } } protected virtual void OnLengthChanged() { var handler = this.LengthChanged; if (handler != null) { handler (this, System.EventArgs.Empty); } } public event System.EventHandler LengthChanged; private int length; } I would like to be able to register/unregister handlers for this event in a method called Observer , which does not know anything about the Dimension class. I

This question already has an answer here: Javascript “addEventListener” Event Fires on Page Load [duplicate] 2 answers I was experimenting [in jsfiddle] w/a function created to append a newly created TextNode to the <p> in the HTML below: <button onclick="addTextNode('YES! ');">YES!</button> <button onclick="addTextNode('NO! ');">NO!</button> <button onclick="addTextNode('WE CAN! ');">WE CAN!</button> <hr /> <p id="p1">First line of paragraph.</p> Here is my javascript as well: function addTextNode(text) { var newtext = document.createTextNode(text), p1 = document.getElementById("p1"); p1

I need to debug a web application that uses jQuery to do some fairly complex and messy DOM manipulation. At one point, some of the events that were bound to particular elements, are not fired and simply stop working. If I had a capability to edit the application source, I would drill down and add a bunch of Firebug console.log() statements and comment/uncomment pieces of code to try to pinpoint the problem. But let's assume I cannot edit the application code and need to work entirely in Firefox using Firebug or similar tools. Firebug is very good at letting me navigate and manipulate the DOM.

Hi i have a simple question. here is my code: XmlDocument xmlData = new XmlDocument(); xmlData.Load("xml.xml"); /* Load announcements first */ XmlNodeList announcements = xmlData.GetElementsByTagName("announcement"); for (int i = 0; i < announcements.Count; i++) { ToolStripMenuItem item = new ToolStripMenuItem(); item.Name = announcements[i].FirstChild.InnerText; item.Text = announcements[i].FirstChild.InnerText; /* HERE IS WERE I NEED HELP */ item.Click += new EventHandler(); this.freedomMenu.Items.AddRange(new System.Windows.Forms.ToolStripItem[] { item }); } The xml LastChild holds