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Total Hits: 53 | Today: 0
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Author: Ted Pattison
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This month's installment represents the final column in a series of three focusing on programming events. In the previous two columns, I showed you how to define and raise events (see Basic Instincts: Programming with Events Using .NET and Basic Instincts: Static Event Binding Using WithEvents). I also explained how to wire up event handlers using both dynamic and static event binding. This month I am going to conclude my coverage of events by showing some practical examples of handling some of ...
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Total Hits: 38 | Today: 0
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Author: Alessandro Febretti
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Reflection is a feature that allows a program to find out type (and metadata) information about objects at run-time. Programs written in languages that support Reflection, like Java and the CLR languages family (C#, Visual Basic .NET etc.) can inspect types, obtain detailed information about class members, dynamically instantiate classes and invoke methods at run-time. The .NET Framework exposes its reflection services through the System.Reflection namespace. Late-bound invocation, for instance,...
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Total Hits: 36 | Today: 0
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Author: Paul Stovell
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The aim of this article is to give you an understanding of how I perform business object validation in Trial Balance, a personal accounting project of mine. This article was originally a blog post that featured on my website, which you can see here. My approach borrows largely from the technique published in Rocky Lhotka's Expert Business Objects book (don't worry if you haven't read it), but I've added a Stovellian twist to spice things up. I'm also going to detour into a discussion of IDataErr...
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Total Hits: 48 | Today: 0
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Author: Jeffrey Richter
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Callback functions are certainly one of the most useful pro-gramming mechanisms ever created. The C runtime's qsort function takes a callback function to sort elements within an array. In Windows, callback functions are required for window procedures, hook procedures, asynchronous procedure calls, and more. In the Microsoft® .NET Framework, callback methods are used for a whole slew of things. You can register callback methods to get assembly load/unload notifications, unhandled exception notifi...
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Total Hits: 259 | Today: 1
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Author: josekonoor.
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Dot Net Remoting is a simple programming model/framework which allows objects from different machines/processes/app-domains to communicate each other. It allows the flexibility of using different types of communication protocols (tcp, http etc..) and message formatters (binary, SOAP etc..). Communication among different app-domains is facilitated by Remoting objects. Remoting objects can be hosted using Managed Executables/IIS/.Net Component Services. It is also possible for .Net applications ru...
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Total Hits: 55 | Today: 0
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Author: Salman Ahmed
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All of us have been exposed to event driven programming of some sort or the other. C# adds on value to the often mentioned world of event driven programming by adding support through events and delegates. This article is a part of a series that aims at understanding fully the way in which delegates and events operate. Part1 helps you understand the role of multicast delegates in the context of UI interaction. The emphasis of this article would be to identify what exactly happens when you add an ...
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Total Hits: 319 | Today: 0
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Author: Jon Shemitz
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When you write .NET code that takes callback parameters, your first instinct may be to use delegates, but it may not occur to you that you can use an interface instead. Learn why and when an interface may be a better answer....
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Total Hits: 132 | Today: 0
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Author: arul chinnappan
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Delegate is type which holds the method(s) reference in an object. It is also reffered as a type safe function pointers....
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Total Hits: 54 | Today: 0
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Author: spiderman_anhvu
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When you develope your application. I'm sure that you have to handler many many objects. So If them have to interact with the same source data, I think that you must find a way to make them update with the change of data. Observer pattern is the key you can use for this solution! I have searched this website and found a little article talk about observer pattern. And I have read some article about event and delegate, too. So that I want to show you - the new developers the way to implement obser...
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Total Hits: 45 | Today: 0
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Author: Stewart
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Save Time using Generics creating EventArgs.
This article describes how to create a generics based EventArgs Class.
I have been working on a large project that has required me to write a ton of event args classes just to pass an object of one type or another in the event.
.net already contains an generic EventHandler Deleagate.
This class works but you do not get intellisense and need to cast objects to the proper type. After writing 20 or so different classes I came up with the idea...
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Total Hits: 28 | Today: 0
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Author: elektrowolf
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There are many kinds of event arguments you often need, e.g. CancelEventArgs. This library contains a collection of event arguments.
These interfaces allow you to easily handle multiple events in one handler function.
The ICancelEventArgs contains two members (bool IsCanceled { get; } void Cancel();) to prevent event handlers from setting the Canceled property to false by using code like this......
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Total Hits: 45 | Today: 0
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Author: Ted Pattison
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This month's Basic Instincts column builds upon my last three columns in which I introduced and explained the fundamental concepts and syntax associated with delegates and events. Last month I showed you how to design and write a simple class that defines and raises events. You also saw how to dynamically bind an event handler to an event using the AddHandler keyword. This month I am going to discuss static event binding, an alternative technique for registering an event handler....
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Total Hits: 28 | Today: 0
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Author: Michael Foster and Gilberto Araya
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In Windows Forms applications, similar commands, such as those in a menu and their counterparts on a toolbar, are not automatically related. They don't fire the same event or run the same handler routine. Yet code that allows the same or similar user commands to fire the same code simplifies development.
This article describes the principles of command management and why it's important to have functional commands that are not exclusive to any one UI element. In order to provide an MFC-l...
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Total Hits: 47 | Today: 0
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Author: DaveyM69
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When I first started progamming in C#, I got lost in the world of events and delegates. I searched CodeProject and Google etc but couldn't find any basic examples to just get me started so I could then experiment for myself. Most of what I found had either complicated object structures, silly names that were impossible to follow and meant nothing or insisted on explaining every last detail and variation and thus became confusing....
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Total Hits: 24 | Today: 0
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Author: Marc Merritt
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I'm an instant gratification kind of person. I like to see who and from where my machine is being accessed, as it occurs. This tool allows you to do just that and provides a number of other event log monitoring capabilities....
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Total Hits: 21 | Today: 0
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Author: Igor Velikorossov
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Most applications directly or indirectly deal with databases and collections of objects. These collections are bound to some UI shown to the user, updated, saved... Well, you know the drill. Here, I would like to share the approach that works best for me....
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Total Hits: 28 | Today: 1
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Author: J. Dunlap
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This article aims to show you what goes on behind the "magic" that the compiler does when you declare a simple event member in a class. It is meant as a beginner article to answer a frequently-asked question, so please don't vote it down just because it is very basic....
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Total Hits: 30 | Today: 0
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Author: Ulrich Proeller
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One of the most powerful features of the .NET Framework is Reflection. It enables us to dynamically load any assembly, enumerate its class types and even instantiate a class and call its properties and methods. We can do all this without any prior knowledge of the assembly we want to use.
Of course, in practice, we mostly know something about the assemblies to use them reasonably. This can be the name of a class, the name of a method, or a custom attribute which is attached to a class or a me...
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Total Hits: 22 | Today: 0
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Author: Neil Baliga
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If you’ve used the new MS Office products recently, you’ve noticed that Outlook, for instance, does not let you log off unless the application is closed. This is because Outlook does its data finalization when it closes and does not want cached data to be corrupted by a user logging off.
I recently worked on an application where we had to log streaming data which was cached for performance reasons, and then dumped the data to a file after certain criteria was met. The importance of the data m...
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Total Hits: 35 | Today: 0
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Author: Chris Sells
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Once upon a time, in a strange land south of here, there was a worker named Peter. He was a diligent worker who would readily accept requests from his boss. However, his boss was a mean, untrusting man who insisted on steady progress reports. Since Peter did not want his boss standing in his office looking over his shoulder, Peter promised to notify his boss whenever his work progressed. Peter implemented this promise by periodically calling his boss back via a typed reference like so....
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