Yet another extension method to combine two observable collections, this time we have IObservable<T>.Concat which is very similar to IObservable<T>.Merge, but crucially, when you concatenate one observable collection to another, the subscription to the second observable collection happens after the first had completed! Here’s a quick illustration of how the two methods differ: As you’ve …
The IObservable<T>.CombineLatest extension method is very similar to IObservable<T>.Zip and IObservable<T>.Merge in that it combines two observable collections and returns a new one. Unlike IObservable<T>.Merge, IObservable<T>.CombineLatest does not require the merged observable collections to be of the same type. Like IObservable<T>.Zip, IObservable<T>.CombineLatest combines ‘pairs‘ of values from the two observable collections, but unlike Zip when …
In my previous post I used the IObservable<T>.Zip extension method in the Drag-and-Drop example, which takes two observable collections and runs a function over them to return a new observable collection of potentially a different type. But what if you just want to simply merge the two observable collections into one stream? Well, Rx API …
As you may have read about on numerous MVP’s blogs already, there’s an ongoing research project at Microsoft’s DevLabs called Reactive Extensions for .Net (Rx) which introduces a push-style duality (equal and opposite) of the traditional pull-style enumeration using Linq. Erik Meijer gave a 30 mins introduction to the reactive framework in this video, I …
Linq Over Events – Playing with the Rx Framework Read More »
And here’s the full example with a method to check whether an IP address is local: http://www.csharp-examples.net/local-ip/
To get the value of a private field of an instance in C#: Similarly, you can quite easily retrieve the value of a const or static field for a type, simply replace BindingFlags.Instance with BindingFlags.Static and call GetValue with null:
As you’re probably aware of already, LINQ comes in two flavours – using Lambda expressions and using SQL-like query expressions: Both yields the same result because query expressions are translated into their lambda expressions before they’re compiled. So performance-wise, there’s no difference whatsoever between the two. Which one you should use is mostly personal preference, …
In the last couple of days or so I have spent some time reading Karl Seguin’s excellent and FREE to download ebook – Foundations of Programming which covers many topics from dependency injection to best practices for dealing with exceptions. The main topic that took my fancy was the Back to Basics: Memory section, here’s …
If you’ve used events in C# before, you’ve probably written code like this too: This is perfectly ok and normal to do, but can quickly become tiresome if you have to fire events in multiple places in your code and have to do a null reference check every time! So instead, I have been using …
Pattern for dealing with null handler for events in C# Read More »
Over the last couple of days I have read a number of blogs on the topic of covariance and contravariance, a new feature to be introduced in the upcoming C# 4.0 release. Whilst most of the blog posts were happy to provide a detailed account of what these terms mean and provide some simple examples, …
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