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The revised order confirmation form would use the following form action tag, in which the form uses the HTTP POST method instead of GET: <FORM ACTION="confirm_order" METHOD="POST"> When the form is submitted, the HTTP request might look as follows: POST /confirm_order HTTP/10 Content-Type: application/x-www-form-urlencoded Content-Length: 45 session-id%3D3927a837e947df203784d309c8372b8e The URL in the address bar would simply read https://wwwdeliver-me-pizzacom/ confirm_order, with no session-id included in it If Alice were to paste the preceding URL into an e-mail sent to Meg, then Meg would not be able to see the same confirmation form that Alice does because the session-id is not included in the URL Alice might now instead have to send a screenshot of the pizza order screen to Meg to share the details of the order.

If you never write multithreaded code, you never have to worry about thread affinity if you do everything on one thread, it will always be the right one. But as soon as multiple threads get involved either explicitly or implicitly you may need to add code to get things back on the right thread. ASP.NET has a similar problem. It makes contextual information about the current request available to the thread handling the request, so if you use multiple threads to handle a single request, those other threads will not have access to that contextual information. Strictly speaking, this isn t a thread affinity issue ASP.NET can use different threads at different stages of handling a single request but it presents the same challenge to the developer: if you start trying to use ASP.NET objects from some random thread, you will have problems. The .NET Framework defines a solution that s common to WPF, Windows Forms, and ASP.NET. The SynchronizationContext class can help you out if you find yourself on the wrong thread when using any of these frameworks. Example 16-7 shows how you can use this in an event handler for a GUI application the click handler for a button, perhaps.

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Always remember that even if you have not created any threads explicitly, that doesn t mean you re necessarily writing single-threaded code. Some .NET Framework classes will bring extra threads into play implicitly. For example, the CLR s garbage collector runs finalizers on a distinct thread.

SynchronizationContext originalContext = SynchronizationContext.Current; ThreadPool.QueueUserWorkItem(delegate { string text = File.ReadAllText(@"c:\temp\log.txt"); originalContext.Post(delegate { myTextBox.Text = text; }, null);

});

The code reads all the text in from a file, and that s something that might take awhile Event handlers in WPF and Windows Forms are called on the thread that the event source belongs to a UI thread (Or the UI thread if, like most desktop applications, you have only one UI thread) You should never do slow work on a UI thread thread affinity means that if your code is busy using that thread, none of the UI elements belonging to that thread will be able to do anything until you re finished The user interface will be unresponsive for as long as you keep the thread busy So Example 16-7 uses the thread pool to do the work, keeping the UI thread free.

While that might be more inconvenient for Alice, using the POST method prevents her from simply sending a URL to Meg that would allow Meg to place the order without Alice s consent While POST can sometimes be used to prevent the type of information leakage shown previously, referrers can also leak in other ways that do not require any user interaction For instance, if instead of a link to wwwgrocery-store-sitecom on the order completion page, an image tag such as <IMG SRC=http://wwwgrocery-store-sitecom/bannergif> were included, the referrer URL with the session-id would appear in wwwgrocery-store-sitecom s logs due to the GET request for bannergif..

But the code wants to update the UI when it has finished it s going to put the text it has retrieved from the file into a text box Since a text box is a UI element, it has thread affinity we can update it only if we re on the UI thread This is where Synchroniza tionContext comes to the rescue Before starting the slow work, Example 16-7 reads the SynchronizationContext class s Current property This static property returns an object that represents the context you re in when you read it precisely what that means will depend on what UI framework you re using (The object you get back works differently depending on whether your application uses WPF, Windows Forms, or ASPNET) But the exact implementation doesn t matter you just need to hold on to it until you need to get back to that context.

Having grabbed the context while we were in the click handler, we then kick off the work in the thread pool And once that work is complete, it calls the stored SynchronizationContext object s Post method Post takes a delegate, and it ll invoke that delegate back in whatever context you were in when you grabbed the context So in this case, it ll invoke our delegate on the UI thread that the button belongs to Since we re back on our application s UI thread, we re now able to update the text box..

There are some persistent myths surrounding threads, which sometimes lead to their overuse. As the current trend seems to be for the number of logical processors in typical machines to edge ever upward, developers sometimes feel practically obliged to write multithreaded code. Since using threads correctly is difficult and error-prone, it s worth

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