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• Deferred execution gotchas

  I was trying to be clever the other day and try to chain assertions on an array: [ Test ] public void This_does_not_work() { var items = new [] {1, 2, 3, 4, 5}; items .Each(x => x.ShouldBeLessThan(0)) .Each(x => x.ShouldBeGreaterThan(10)); } I did... Posted Aug 13 2008, 08:08 AM by bogardj with | with 3 comment(s) Filed under: C#, LINQ

• Enumeration classes

  A question came up on the ALT.NET message board asking whether Value Objects should be used across service boundaries. Of course, the conversation took several detours, eventually coming to the question, "what do you do about enumerations crossing... Posted Aug 12 2008, 08:05 AM by bogardj with | with 29 comment(s) Filed under: Domain-Driven Design, C#

• When a space isn't a space

  I ran into a scenario recently where this test failed: [ Test ] public void You_have_to_be_kidding_me() { string a = "You have to be kidding me " ; string b = "You have to be kidding me " ; a.ShouldEqual(b); } It took me quite a while... Posted Jun 26 2008, 07:15 AM by bogardj with | with 8 comment(s) Filed under: C#

• Some improved LINQ operators

  I ran across a couple of scenarios the other day that were made pretty difficult given the current LINQ query operators. First, I needed to see if an item existed in a collection. That's easy with the Contains method, when you want to find item that... Posted Jun 07 2008, 07:39 PM by bogardj with | with 13 comment(s) Filed under: C#, LINQ

• Forbidden Void type in C#

  I've had this come up a couple of times. I'd really like to be able to do something like this: Func < bool , Void > whyNot = test => Console .WriteLine(test); This is equivalent to: Action < bool > okThisWorks = test => Console... Posted Jun 05 2008, 10:26 PM by bogardj with | with 3 comment(s) Filed under: C#

• LINQ query operators: lose that foreach already!

  Now that .NET 3.5 is out with all its LINQ query operator goodness, I feel like going on a mean streak of trashing a lot of our (now) pointless foreach loops. Some example operations include: Transformations Aggregations Concatenations Filtering As I... Posted May 09 2008, 06:11 PM by bogardj with | with 6 comment(s) Filed under: C#, LINQ

• Enhancing mappers with LINQ

  The "big 3" higher-order functions in functional programming are Filter, Map and Reduce. When looking at the new C# 3.0 LINQ query operators, we find that all three have equivalents : Filter = Where Map = Select Reduce = Aggregate Whenever you... Posted May 08 2008, 07:49 AM by bogardj with | with 12 comment(s) Filed under: Domain-Driven Design, C#, LINQ

• Stop creating custom delegate types

  Note to OSS and framework developers: Please stop creating custom delegate types. Use the Action and Func delegates instead. The problem is that delegate types with the same signature are not convertible to each other. For example, none of these assignments... Posted Mar 26 2008, 10:03 AM by bogardj with | with 17 comment(s) Filed under: C#

• Variations on a Func-y theme

  Delegates have come a long way since C# 1.0 debuted back in early 2002. The progression from using delegate parameters (outside of events) grew from quite cumbersome to fairly expressive with Lambda expressions with C# 3.0. Functional style programming... Posted Mar 22 2008, 01:15 PM by bogardj with | with 4 comment(s) Filed under: C#

• Last XML serializer I'll ever write

  I've made this class probably a half dozen times, and I'm getting pretty tired of writing it. It seems like every application I write has to serialize and deserialize back and forth between XML strings and objects. For future reference, here it... Posted Feb 19 2008, 10:35 PM by bogardj with | with 6 comment(s) Filed under: C#

• Some C# obscurities

  I'm sure everyone's tired of hearing about C# 3.0 features like lambda expressions, extension methods, anonymous types and so on. Before you fall in love with the new features, there are a few oldies-but-goodies that revolve around the "... Posted Jan 30 2008, 09:40 PM by bogardj with | with 6 comment(s) Filed under: C#

• Abusing using statements

  I've always thought that the using statement was one of the most useful features included in C#. It's easy to use: public string GetFileTextForParsing( string path) { string contents = null ; using ( StreamReader reader = File .OpenText(path)... Posted Jan 15 2008, 11:04 PM by bogardj with | with 7 comment(s) Filed under: C#, ASP.NET, MVC

• Extension methods and primitive obsession

  In another water-cooler argument today, a couple of coworkers didn't like my extension method example . One main problem is that it violates instance semantics, where you expect that a method call off an instance won't work if the instance is... Posted Dec 18 2007, 04:29 PM by bogardj with | with 1 comment(s) Filed under: C#, Code smells

• Ruby-style Array methods in C# 3.0

  A while back I played with Ruby-style loops in C# 3.0 . This sparked my jealousy of other fun Ruby constructs that I couldn't find in C#, and a couple of them are the "each" and "each_with_index" methods for arrays. Here's... Posted Dec 14 2007, 04:12 PM by bogardj with | with 2 comment(s) Filed under: C#

• Hall of shame

  We keep a "Hall of Shame" of WTF-level code snippets to remind us that however bad we might think things get, it could always be worse. It also serves as a reminder to us that we can't be complacent with ignorance, and lack of strong technical... Posted Nov 29 2007, 05:05 PM by bogardj with | with 4 comment(s) Filed under: Legacy Code, C#, People