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Simulated Covariance for .NET Generics
I just wrote this pattern, but I am not sure if I should add it officially to the Framework Design Guidelines. It seems like a bit of a corner case scenario, though I do get questions about it from time to time. Anyway, let me know what you think. Different Read More...
Posted 02 April 08 08:00 by kcwalina | 18 Comments   
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Synchronization at the Right Level
I get a lot of questions about why the new generic collection interfaces (IList<T> for example) do not support synchronization. There are several reasons for it. One, probably the main, is that in practice synchronizing on the level of a single Read More...
Posted 05 May 06 11:24 by kcwalina | 2 Comments   
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C5 Collections
Peter Sestoft and his team just released a library of collections for the CLI called C5 Collections . Unlike the Power Collections , this library introduces many new abstractions that are not present in the .NET Framework. The benefit of such approach Read More...
Posted 20 February 06 10:58 by kcwalina | 5 Comments   
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Disposable Collection
Somebody asked me today, if we have a collection that is disposable and calls dispose on all its items when the collections.Dispose method is called. You can implement such collection by inheriting from List<T> and adding Dispose logic. If you add Read More...
Posted 10 February 06 01:38 by kcwalina | 12 Comments   
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Immutable Collections
I just saw an interesting post that talks about a general pattern of immutable reference types. Good read. I highly recommend it! At the end of the post the author suggests that we add “value object” generic collection to the BCL. It’s an interesting Read More...
Posted 22 November 05 01:28 by kcwalina | 4 Comments   
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Why we don’t recommend using List<T> in public APIs
We don’t recommend using List<T> in public APIs for two reasons. List<T> is not designed to be extended. i.e. you cannot override any members. This for example means that an object returning List<T> from a property won’t be able to get Read More...
Posted 26 September 05 12:35 by kcwalina | 22 Comments   
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System.Collections vs. System.Collection.Generic and System.Collections.ObjectModel
Many people ask how the new.NET Framework 2.0 generic collections relate to the non-generic collections we shipped before. So, here you go. The most important types are in bold font. List<T> is basically a better ArrayList. It is optimized for speed, Read More...
Posted 23 September 05 08:10 by kcwalina | 22 Comments   
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List<T> vs. ArrayList Performance
Rico just posted a new performance quiz where he compares performance of List<T> and ArrayList in some simple scenarios. List<T> is my Whidbey baby, so of course I had to answer that List<T> is faster :-) Read More...
Posted 25 August 05 05:25 by kcwalina | 0 Comments   
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PowerCollections Beta Avaliable
The beta release of the PowerCollections library has been posted today. See http://wintellect.com/WEBLOGS/pgolde/archive/2005/06/03/1304.aspx . Read More...
Posted 03 June 05 08:04 by kcwalina | 1 Comments   
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Generic interfaces, IsReadOnly, IsFixedSize, and array
Peter Golde recently posted about the IsReadOnly and IsFixedSize change we made to the generic collection interfaces.There are also several other discussions around the net on this topic. I thought I write up something to explain the motivation and our Read More...
Posted 18 May 05 11:32 by kcwalina | 10 Comments   
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The reason why Collection, ReadOnlyCollection, and KeyedCollection were moved to System.Collections.ObjectModel namespace
Several people asked me why Collection<T>, ReadOnlyCollection<T>, and KeyedCollection<TKey,TValue> were moved to System.Collections.ObjectModel namespace. Here are the two main reasons: 1. Microsoft.VisualBasic namespace contains a non-generic Read More...
Posted 15 March 05 02:55 by kcwalina | 30 Comments   
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The reason why IEnumerator extens IDisposable
Lot ’s of people asked me why IEnumerator<T> extends IDisposable. We did this to support some obscure, yet important scenarios where an enumerator enumerates database rows, or files in a directory, etc. In such cases, the enumerator usually opens Read More...
Posted 07 January 05 06:35 by kcwalina | 7 Comments   
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Power Collections on GotDotNet Featured Sites
I just noticed that the Power Collections project made it to the “Featured Sites” on GotDotNet. See http://www.gotdotnet.com/content/featuredsite/powercollections/default.aspx For those who don’t know, Power Collections is a community open source library Read More...
Posted 03 November 04 05:46 by kcwalina | 1 Comments   
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IComaprer & IComparable Refactoring Proposal
We are exploring the possiblility of changing the design of IComparer<T> and IComparable<T> interfaces that will ship with Whidbey. This post describes some more detail on the issues we are trying to address with the design change and we are Read More...
Posted 27 October 04 09:01 by kcwalina | 23 Comments   
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System.Collections.Generic Dictionary Capacity, Hashing, and Collisions.
Somebody asked me a question how to set the initial capacity of System.Collections.Generic.Dictionary<K,V> if one knows that the Dictionary will contain 1000 entries. The short answer Dictionary<int,string> numbers = new Dictionary<int,string>(1000); Read More...
Posted 06 August 04 08:59 by kcwalina | 6 Comments   
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