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  • Contract classes and nested types within interfaces

    I've just been going through some feedback for the draft copy of the second edition of C# in Depth. In the contracts section, I have an example like this: [ContractClass( typeof (ICaseConverterContracts))] public   interface ICaseConverter {     string Convert( string text); ...
    Posted to Jon Skeet: Coding Blog by skeet on Sat, Oct 31 2009
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  • Recent activities

    It's been a little while since I've blogged, and quite a lot has been going on. In fact, there are a few things I'd have blogged about already if it weren't for "things" getting in the way. Rather than writing a whole series of very short blog posts, I thought I'd wrap them...
    Posted to Jon Skeet: Coding Blog by skeet on Thu, Sep 3 2009
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  • Tricky decisions... Code Contracts and Parallel Extensions in C# in Depth 2nd edition

    I'd like some feedback from readers, and I suspect my blog is the simplest way to get it. I'm currently writing chapter 15 of C# in Depth, tentatively about Code Contracts and Parallel Extensions. The problem is that I'm 15 pages in, and I haven't finished Code Contracts yet. I suspect...
    Posted to Jon Skeet: Coding Blog by skeet on Wed, Aug 5 2009
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  • Evil Code of the Day: variance and overloading

    (Note that this kind of breakage was mentioned a long time ago in Eric Lippert's blog , although not in this exact form.) Whenever a conversion becomes available where it wasn't before, overload resolution can change its behaviour. From C# 1 to C# 2 this happened due to delegate variance with...
    Posted to Jon Skeet: Coding Blog by skeet on Mon, Jul 13 2009
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  • Faking COM to fool the C# compiler

    C# 4 has some great features to make programming against COM components bearable fun and exciting. In particular: PIA linking allows you to embed just the relevant bits of the Primary Interop Assembly into your own assembly, so the PIA isn't actually required at execution time Named arguments and...
    Posted to Jon Skeet: Coding Blog by skeet on Tue, Jul 7 2009
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  • Evil code of the day

    At a glance, this code doesn't look particularly evil. What does it do though? Compile it with the C# 4.0b1 compiler and run it... using System; class Base {     public   virtual   void Foo( int x, int y)     {         Console...
    Posted to Jon Skeet: Coding Blog by skeet on Fri, Jul 3 2009
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  • OS Jam at Google London: C# 4 and the DLR

    Last night I presented for the first time at the Google Open Source Jam at our offices in London. The room was packed, but only a very few attendees were C# developers. I know that C# isn't the most popular language on the Open Source scene, but I was still surprised there weren't more people...
    Posted to Jon Skeet: Coding Blog by skeet on Fri, Jun 19 2009
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  • Dynamic type inference and surprising possibilities

    There have been mutterings about the fact that I haven't been blogging much recently. I've been getting down to serious work on the second edition of C# in Depth, and it's taking a lot of my time. However, I thought I'd share a ghastly little example I've just come up with. I've...
    Posted to Jon Skeet: Coding Blog by skeet on Wed, Jun 17 2009
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  • C# 4.0: dynamic<T> ?

    I've not played with the VS2010 CTP much yet, and I've only looked briefly at the documentation and blogs about the new C# 4.0 dynamic type, but a thought occurred to me: why not have the option of making it generic as a way of saying "I will dynamically support this set of operations"...
    Posted to Jon Skeet: Coding Blog by skeet on Thu, Oct 30 2008
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  • DotNetRocks interview

    Last Monday evening I had a chat with the guys from DotNetRocks , and today the show has gone live . I wouldn't claim to have said anything particularly earth-shattering, and regular readers will probably be familiar with many of the themes anyway, but I thoroughly enjoyed it and hope you will too...
    Posted to Jon Skeet: Coding Blog by skeet on Tue, Oct 7 2008
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  • C# 4: Immutable type initialization

    (I'm giving up with the numbering now, unless anyone particularly wants me to keep it up. What was originally going to be a limited series appears to be growing without end...) As Chris Nahr pointed out in my previous post , my earlier idea about staged initialization was very half-baked. As he's...
    Posted to Jon Skeet: Coding Blog by skeet on Sat, Mar 15 2008
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  • C# 4 idea: Iterator blocks and parameter checking

    Iterator blocks have an interesting property: they defer execution. When the method (or property) is called, none of your code is executed - it only starts running when MoveNext() is first called. Deferred execution is a great thing in many ways, but it's a pain when it comes to parameter checking...
    Posted to Jon Skeet: Coding Blog by skeet on Sun, Mar 2 2008
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  • My Wishlist for C# 4

    [Edit: fixed the not-ready-for-publication problems] There seems to be more than few people blogging about what they hope C# 4 will do for them. I haven't seen one that really synchronizes with my thoughts, so I'd thought I'd post my own list. Variance A good story with regard to variance...
    Posted to Peter Ritchie's MVP Blog by PeterRitchie on Tue, Feb 12 2008
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  • Language design, when is a language "done", and why does it matter?

    As per previous posts, I've been thinking a fair amount about how much it's reasonable to keep progressing a language. Not only have thoughts about C# 4 provoked this, but also a few other sources: Don Box on Ted Neward on Java (yes, two separate links - but view both) Don again on the "doneness"...
    Posted to Jon Skeet: Coding Blog by skeet on Mon, Feb 11 2008
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  • C# 4, part 4: My manifesto and wishlist

    The final part of this little series is the one where I suggest my own ideas for C# 4, beyond those I've already indicated my approval for in earlier posts. Before I talk about individual features, however, I'd like to put forward a manifesto which could perhaps help the decision-making process...
    Posted to Jon Skeet: Coding Blog by skeet on Sun, Feb 10 2008
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  • Macros, and languages within languages

    Ian Griffiths mailed me about macros, and explained how LISP macros were very different to C/C++ macros, working at a language level instead of at a text level. I won't pretend to understand all about what would be possible and what wouldn't, but Ian gave a good example: query expressions in...
    Posted to Jon Skeet: Coding Blog by skeet on Fri, Feb 8 2008
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  • C# 4, part 3: Ideas from Microsoft

    Microsoft haven't committed to anything in C# 4 yet. However, there have been hints about what they've been considering in Eric Lippert's blog , and more than hints in Charlie Calvert's blog . There's not a lot to go on yet, but: Immutability support Most of Eric's posts about...
    Posted to Jon Skeet: Coding Blog by skeet on Thu, Feb 7 2008
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  • C# 4, part 2: Ideas from other community members

    There has been a fair amount of speculation online about what should be in C# 4. I've taken the list below from a few posts, primarily those by Ayende and Jeremy Miller . I've deliberately left out the ideas that Microsoft have mentioned that they're at least considering - they'll come...
    Posted to Jon Skeet: Coding Blog by skeet on Thu, Feb 7 2008
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  • C# 4, part 1: Looking back at the past

    Everyone else is speculating about what's going to be in C# 4 (and various possibilities are coming out of MS), so I thought it would be wise to start my own series of wishlist posts before I miss the boat completely. In this first post, I'm not going to look at the future at all - I'm going...
    Posted to Jon Skeet: Coding Blog by skeet on Tue, Feb 5 2008
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