BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

lehon — Tue, 26 Jun 2007 10:29:21 GMT

"Whereas the non-generic collections offered a synchronized wrappers through their APIs — e.g. Hashtable.Synchronized—the non-generics don’t."

Shouldn't it be generics instead of non-generics in the end of the sentence above?

HybridDictionary

Finnsson — Tue, 26 Jun 2007 12:24:41 GMT

Hi,

I couldn't agree more about the reasons to switch to generic collections. However, it seems like you have forgotten to convert the collections in System.Collections.Specialized. I for one like to use HybridDictionary since it will give me OK performance for both small and large collections and I would love a generic alternative to use. Do you plan to create a System.Collections.Generic.Specialized or System.Collections.Specialized.Generic?

Take care,

Finnsson

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

Henry Boehlert — Tue, 26 Jun 2007 12:30:07 GMT

>Additional Considerations ...

>3. Hashtable.Add() returns the index

No, that seems wrong. Probably a "copy'n'paste" bug from "4. ArrayList.Add()", isn't it?

Although, that would be one nice feature to have ...

Reminds me of ListDictionary and it's friends in System.Collections.Specialized.

Any hints on how to migrate those?

Any news on Set<T>?

re: HybridDictionary, Specialized namespace

Zak Derbazi — Tue, 26 Jun 2007 18:13:11 GMT

i think there is no need for a Specialized generic namespace as all of the non-generic classes have their generic equivalent implementations. For the HybridDictionaty it seems straightforward to use a SortedList/SortedDictionary with an initial capacity depending on scenario.

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

Adi — Tue, 26 Jun 2007 19:03:20 GMT

Trackback from http://dotmad.blogspot.com/2007/06/non-generic-to-generic-types-conversion.html

Further Index Problems for VB projects

Peter Walker — Tue, 26 Jun 2007 19:17:11 GMT

If you're using a VB.NET project then be careful - ordinary collections are indexed from 1 whereas System.Collections.Generic.List is indexed from 0.

Non-Generic Collections to be Removed from Silverlight [Inbar Gazit]

BCL Team Blog — Tue, 26 Jun 2007 19:25:55 GMT

Those of you who are already using Silverlight 1.1 Alpha may have seen that the familiar non-generic

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

Inbar Gazit — Tue, 26 Jun 2007 19:27:55 GMT

Henry,

You are correct and the blog was fixed.

Also, for the Specialized Collections there are no direct non-generic equivilants and so I ommited them from this post.

As for Set<T>, we have HashSet<T> introduced in Orcas see http://blogs.msdn.com/bclteam/archive/2006/11/09/introducing-hashset-t-kim-hamilton.aspx for details.

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

brian — Wed, 27 Jun 2007 02:40:42 GMT

What about other kinds of set types? There does not seem to be an ISet<T> interface or even an abstract Set<T> to extend.

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit] - Senetance modfication

Ruwan Perera — Wed, 04 Jul 2007 08:55:46 GMT

The paragraph before the last one has the below sentence as

"However, the Hashtable.Item property is single reader/multiple writer threadsafe."

Shouldn't the above sentence be rephrase as

"However, the Hashtable.Item property is multiple reader/single writer threadsafe."

Silverlight 1.1の基本クラスライブラリにおける非ジェネリック系のCollectionについて

ディベロッパー製品開発統括部 Blog — Fri, 20 Jul 2007 12:01:48 GMT

Silverlight 1.1の基本クラスライブラリにおける非ジェネリック系のCollectionについて Alpha版で調査をなされていらっしゃるお客さまも多いのではと思いますが、Silverlightのランタイムにおいて非ジェネリック系のコレクション

Silverlight 1.1の基本クラスライブラリにおける非ジェネリック系のCollectionについて

Noticias externas — Fri, 20 Jul 2007 13:09:02 GMT

Alpha版で調査をなされていらっしゃるお客さまも多いのではと思いますが、Silverlightのランタイムにおいて非ジェネリック系のコレクションクラスを取り除く予定でございます。また、ジェネリックのコレクション

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

Ole — Wed, 25 Jul 2007 10:07:27 GMT

We have just been bitten by the fact that Dictionary is not multiple reader/single writer thread-safe.

We had simply replaced all usages of Hashtable with Dictionary, and we were not aware that Dictionary is not thread-safe at all. According to MSDN, it is not even safe for multiple readers (no writers)!

For now, we have decided to go back to Hashtable as we can not accept the loss of performance we will face if we need to use locks for all read access. The ReaderWriterLock is not an option as it is notoriously slow.

I guess we will use ReaderWriterLockSlim when Orcas ships.

Does anyone know a good Hashtable<T> implementation for .Net 2.0? It need to have the same threading characteristics as Hashtable.

I really think it is a huge mistake that such a class is not included with the framework. It is something that is needed all the time by high perf. web and client/server applications.

Bind a Collection to a GridView

Mostly Developers — Thu, 21 Aug 2008 16:51:32 GMT

Bind a Collection to a GridView

BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

HybridDictionary

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

re: HybridDictionary, Specialized namespace

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

Further Index Problems for VB projects

Non-Generic Collections to be Removed from Silverlight [Inbar Gazit]

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit] - Senetance modfication

Silverlight 1.1の基本クラス ライブラリにおける非ジェネリック系のCollectionについて

Silverlight 1.1の基本クラス ライブラリにおける非ジェネリック系のCollectionについて

re: BCL Refresher: Converting the Non-Generic Collections [Inbar Gazit]

Bind a Collection to a GridView

Silverlight 1.1の基本クラスライブラリにおける非ジェネリック系のCollectionについて

Silverlight 1.1の基本クラスライブラリにおける非ジェネリック系のCollectionについて