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Assume that you wish to define a class (SportsCarTS) that is automatically thread-safe in nature, even though you have not hard-coded thread synchronization logic within the member implementations. To do so, derive from ContextBoundObject and apply the <Synchronization> attribute as follows: Imports System.Runtime.Remoting.Contexts ' This context-bound type will only be loaded into a ' synchronized (hence thread-safe) context. <Synchronization> _ Class SportsCarTS Inherits ContextBoundObject End Class Types that are attributed with the <Synchronization> attribute are loaded into a thread-safe context. Given the special contextual needs of the SportsCarTS class type, imagine the problems that would occur if an allocated object were moved from a synchronized context into a nonsynchronized context. The object is suddenly no longer thread-safe and thus becomes a candidate for massive data corruption, as numerous threads are attempting to interact with the (now thread-volatile) reference object. To ensure the CLR does not move SportsCarTS objects outside of a synchronized context, simply derive from ContextBoundObject.

Although very few of the applications you will write will need to programmatically interact with context, here is an illustrative example. Create a new console application named ContextManipulator. This application defines one context-agile class (SportsCar) and a single context-bound type (SportsCarTS): Imports System.Runtime.Remoting.Contexts ' For Context type. Imports System.Threading ' For Thread type. ' SportsCar has no special contextual ' needs and will be loaded into the ' default context of the app domain. Public Class SportsCar Public Sub New() ' Get context information and print out context ID. Dim ctx As Context = Thread.CurrentContext() Console.WriteLine("{0} object in context {1}", Me.ToString, ctx.ContextID) For Each itfCtxProp As IContextProperty In ctx.ContextProperties Console.WriteLine("-> Ctx Prop: {0}", itfCtxProp.Name) Next End Sub End Class ' SportsCarTS demands to be loaded in ' a synchronization context. <Synchronization()> _ Public Class SportsCarTS Inherits ContextBoundObject Public Sub New() ' Get context information and print out context ID. Dim ctx As Context = Thread.CurrentContext()

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Quote msftQuote = new Quote(); msftQuote.Ticker = "MSFT"; msftQuote.Bid = 30.25M; msftQuote.Ask = 32.00M; msftQuote.Publisher = "PracticalWCF"; Quote ibmQuote = new Quote(); ibmQuote.Ticker = "IBM"; ibmQuote.Bid = 80.50M; ibmQuote.Ask = 81.00M; ibmQuote.Publisher = "PracticalWCF"; proxy.PublishQuote(msftQuote); proxy.PublishQuote(ibmQuote); Quote result = null; result = proxy.GetQuote("MSFT"); Console.WriteLine("Ticker: {0} Ask: {1} Bid: {2}", result.Ticker, result.Ask, result.Bid); result = proxy.GetQuote("IBM"); Console.WriteLine("Ticker: {0} Ask: {1} Bid: {2}", result.Ticker, result.Ask, result.Bid); try { result = proxy.GetQuote("ATT"); } catch (Exception ex) { Console.WriteLine(ex.Message); } if (result == null) { Console.WriteLine("Ticker ATT not found!"); } Console.WriteLine("Done! Press return to exit"); Console.ReadLine(); } } }

Console.WriteLine("{0} object in context {1}", Me.ToString, ctx.ContextID) For Each itfCtxProp As IContextProperty In ctx.ContextProperties Console.WriteLine("-> Ctx Prop: {0}", itfCtxProp.Name) Next End Sub End Class Notice that each constructor obtains a Context type from the current thread of execution, via Thread.CurrentContext(). Using the Context object, you are able to print out statistics about the contextual boundary, such as its assigned ID, as well as a set of descriptors obtained via Context. ContextProperties. This property returns an object implementing the IContextProperty interface, which exposes each descriptor through the Name property. Now, update Main() to allocate an instance of each class type: Sub Main() Console.WriteLine("***** The Amazing Context Application *****") Console.WriteLine() ' Objects will display contextual info upon creation. Dim sport As SportsCar = New SportsCar() Console.WriteLine() Dim sport2 As SportsCar = New SportsCar() Console.WriteLine() Dim synchroSport As SportsCarTS = New SportsCarTS() Console.ReadLine() End Sub As the objects come to life, the class constructors will dump out various bits of context-centric information, as shown in Figure 15-10.

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Given that the SportsCar class has not been qualified with a context attribute, the CLR has allocated sport and sport2 into context 0 (i.e., the default context). However, the SportsCarTS object is loaded into a unique contextual boundary (which has been assigned a context ID of 1), given the fact that this context-bound type was adorned with the <Synchronization> attribute.

Listing 3-14. Output.config Generated by SvcUtil.exe < xml version="1.0" encoding="utf-8" > <configuration> <system.serviceModel> <bindings> <basicHttpBinding> <binding name="basicHttpBinding" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <security mode="None"> <transport clientCredentialType="None" proxyCredentialType="None" realm="" /> <message clientCredentialType="UserName" algorithmSuite="Default" /> </security> </binding> </basicHttpBinding> </bindings> <client> <endpoint address="http://localhost:8080/QuickReturns/Exchange" binding="basicHttpBinding" bindingConfiguration="basicHttpBinding" contract="ITradeService" name="basicHttpBinding" /> </client> </system.serviceModel> </configuration>

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