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copied!<p>With <a href="https://www.postsharp.net/" rel="nofollow">PostSharp</a>, you can easily write and apply custom attributes that add new behaviors to your code - tracing, thread management, exception handling, data binding, and much more.</p> <p>PostSharp works by injecting IL during the build process to weave aspects into the original method.</p> <p><strong>Ready-made patterns</strong></p> <p>PostSharp comes with a library of ready-made pattern implementations including code contracts, INotifyPropertyChanged, immutable, freezable and other threading models.</p> <p>Example: the following snippet shows how the NotifyPropertyChanged attribute automatically implementes the INotifyPropertyChanged interface, including listening to two levels of child objects.</p> <pre><code>[NotifyPropertyChanged] public class CustomerViewModel { public CustomerModel Customer { get; set; } public string FullName { get { if (Customer == null) return null; return string.Format("{0} {1} from {2}", Customer.FirstName, Customer.LastName, Customer.PrincipalAddress != null ? Customer.PrincipalAddress.FullAddress : "?"); } } } </code></pre> <p><strong>Custom patterns</strong></p> <p>PostSharp also has a rich toolkit to automate the implementation of your own patterns.</p> <p>Examples:</p> <p>Tracing:</p> <pre><code>[PSerializable] public class TraceAttribute : OnMethodBoundaryAspect { public override void OnEntry(MethodExecutionEventArgs eventArgs) { Trace.TraceInformation("Entering {0}.", eventArgs.Method); } public override void OnExit(MethodExecutionEventArgs eventArgs) { Trace.TraceInformation("Leaving {0}.", eventArgs.Method); } } } </code></pre> <p>Thread dispatch WPF:</p> <pre><code>[PSerializable] public class GuiThreadAttribute : OnMethodInvocationAspect { public override void OnInvocation(MethodInvocationEventArgs eventArgs) { DispatcherObject dispatcherObject = (DispatcherObject)eventArgs.Delegate.Target; if (dispatcherObject.CheckAccess()) eventArgs.Proceed(); else dispatcherObject.Dispatcher.Invoke(DispatcherPriority.Normal, new Action(() => eventArgs.Proceed())); } } </code></pre> <p>Usage:</p> <pre><code>[Trace] public void CreateCustomer(int id, string name) { /* ... */ } </code></pre> <p><strong>Installation</strong></p> <p>PostSharp can most easily be installed through its <a href="http://www.nuget.org/packages/PostSharp/" rel="nofollow">NuGet package</a>.</p> <pre><code>Install-Package PostSharp </code></pre> <p><strong>Licensing</strong></p> <p>PostSharp is a commercial product with a free edition.</p>

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