Showing posts with label C#. Show all posts
Showing posts with label C#. Show all posts

Tuesday, June 14, 2011

Evolution Of Delegates from .NET 1.x to 3.5 including Code samples.



Delegates were introduced with C# 1.0 (with .NET 1.0) as a way to represent function pointers.  Delegates like most other aspects of advanced C#/.NET programming were often misunderstood and a lot of times programmers didn't even know they were using them inside their code! One source of this problem was a rather cluggy syntax provided with the original C# 1.0 syntax.  Luckily as .NET evolved, so did the syntax for delegates by becoming more concise and clear.  This is exactly what this article focuses on; this is NOT an intro into delegates, how they relate/work with events or a "best practice" guide.
The best way to show delegate syntax in action is to try to solve a simple coding problem with them.  Suppose I get asked this on an interview: I have a form with 2 text boxes and I can input 2 numbers.  What I would like to do is when I click the "=" button (equals) is have the numbers be added via a delegate binary operation, by adding the two numbers.
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