Scott Hanselman

In my new ongoing quest to read source code to be a better developer, I now present the sixth in an infinite number of a weekly series called "The Weekly Source Code." Here's some source I'm reading this week that I enjoyed.

• xUnit is a new Unit Testing Framework from Jim "Original NUnit Guy" Newkirk and Brad "The .NET Guy" Wilson. Posts about the "why" of it are already flying and I remain neutral, like Switzerland. Seems unnecessary to me, but whatever makes you happy. Let's see if there's anything neat in the source. You gotta give them style points for extensibility. See how they make up a new attribute "RepeatTest," give it behavior, then apply it to a test and the Test Runner just runs the test as the yield's return new TestCommands. Clean.

  public class Example
  {
      static int val;
  
      [RepeatTest(5, Timeout=500)]
      public void RepeatingTestMethod()
      {
          Thread.Sleep(100);
          Assert.Equal(2, 2);
          if (val == 0)
          {
              val++;
              Thread.Sleep(1000);
          }
      }
  }
  
  public class RepeatTestAttribute : TestAttribute
  {
      readonly int repeatCount;
  
      public RepeatTestAttribute(int repeatCount)
      {
          this.repeatCount = repeatCount;
      }
  
      public override IEnumerable<ITestCommand> CreateTestCommands(MethodInfo testMethod)
      {
          for (int index = 0; index < repeatCount; index++)
              yield return new TestCommand(testMethod);
      }
  }

• Keith Brown's Password Manager (PWM) - I had my favorite Password Manager crash on launch for me today so I rebuilt it it locally and set the Platform to x86 and it worked. While I was in there...take a look at this bodiless "Record" constructor.

  public Record(string site, string salt, string encryptedUserId, string encryptedPassword, string encryptedNotes, string useSetWindowText, string duration, string nagSpan, string nextReminder, string lastReset, string usageCount) 
          : this(site, salt, encryptedUserId, encryptedPassword, encryptedNotes, "true" == useSetWindowText,
                 "" == duration ? 0 : Convert.ToInt32(duration),
                 "" == nagSpan  ? 0 : Convert.ToInt32(nagSpan),
                 "" == nextReminder ? DateTime.MaxValue : Convert.ToDateTime(nextReminder),
                 "" == lastReset ? DateTime.Now : Convert.ToDateTime(lastReset),
                 "" == usageCount ? 0 : Convert.ToInt32(usageCount)) {
   }

• RhinoMocks (SVN source) - Both Matt Gilbert and Mike Minutillo pointed me (back) to RhinoMocks Mike says he likes the DisposableAction pattern Ayende is fond of.

  namespace Rhino.Commons
  {
      public class DisposableAction<T> : IDisposable
      {
          Proc<T> _action;
          T _val;
  
          public DisposableAction(Proc<T> action, T val)
          {
              if (action == null)
                  throw new ArgumentNullException("action");
              _action = action;
              _val = val;
          }
  
          public T Value { get { return _val; } }
          public void Dispose() { _action(_val); }
      }
  
      public class DisposableAction : IDisposable
      {
          Proc _action;
  
          public DisposableAction(Proc action)
          {
              if (action == null)
                  throw new ArgumentNullException("action");
              _action = action;
          }
          public void Dispose(){ _action(); }
      }
  }

• Monorail HotSwap - While you're there, take a look at these 70 lines of code. I wonder aloud if this leaks Assemblies, but it's OK because it's primarily created as a development speed thing. Clever though. Did YOU know how easy it is to compile new code from within .NET?

  void CodeChanged(object sender, FileSystemEventArgs e)
  {
      string fileName = Path.GetFileNameWithoutExtension(e.FullPath);
      string typeName = controllersNamespace+"."+fileName;
      CompilerParameters options = CreateCompilerOptions();
  
      CSharpCodeProvider provider = new CSharpCodeProvider();
      CompilerResults compilerResults = provider
          .CompileAssemblyFromFile(options, e.FullPath);
  
      container.Kernel.RemoveComponent(typeName);
      
      if(compilerResults.Errors.HasErrors)
          return;
  
      Type type = compilerResults.CompiledAssembly.GetType(typeName);
      container.AddComponent(type.FullName, type);
  }
  

Feel free to send me links to cool source that you find hasn't been given a good read.

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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