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Published 03.09.2013 | Author : admin | Category : Women Need Men

In this article, we look at the asynchronous web service model in Silverlight, and how it can be augmented to allow synchronous web service calls.
I like to create and explore, and Silverlight offers an interesting opportunity to explore a new environment; one in which some things, like the asynchronous web service model, work a little differently than we are used to when developing for the desktop CLR.
Some readers may initially protest that synchronous web service calls have no place in a principally GUI application, because it risks blocking the UI thread, leading to an unresponsive UI etc.
In essence, if one is not working on the UI thread, then why not have synchronous service calls at one's disposal? It was only after some experimentation that I hit upon the techniques that I am going to share with you in this article.
That's all well and good, but what if we are developing a set of class libraries in a disjoint and modular fashion, with contracts that haven't been written with asynchronous execution in mind, and where return values are expected?
You may, like the author did, assume that you could simulate a synchronous web service call by simply using e.g. We can see now why blocking the UI thread doesn't work, and it's a good thing that it doesn't. The ChannelFactory creates a dynamic proxy that we can use to wait on the result of our service method. So, we see that care must be taken in order to avoid making the mistake of attempting this technique from the UI thread. The SynchronousChannelBroker is a class I have written that links all the steps together, and makes performing synchronous web service calls easy and safe. Much like the generic Funcs, they allow us to consume the service proxy in a reasonably simple way, without having to augment or replace the Visual Studio Add Service Reference functionality.
So why can't we build a 'SynchronousChannelFactory' that will use the method signatures present in the service contract? In addition to providing us with the means to perform synchronous web service calls, I have also included a ChannelManager that efficiently caches service channels. Of course it's all strongly typed, and the generic types must match the parameter types in the service interface methods.
In the above example we retrieve the ISimpleService service channel from the ChannelManager. We see that in order to prevent the service call from happening on the UI thread, we call EnsureUIThread(). The included UISynchronizationContext uses the applications RootVisual (usually a Page) to get the UI thread's Dispatcher. Sometimes we might like to use the UISynchronizationContext before the root visual has been assigned.
As mentioned earlier, the ChannelManager is used to create or retrieve cached channel proxies. Assuming that we will mostly be looking to use generated proxies, I wanted to provide a way to call a method to initiate the service channel when the channel is created.
Provided herewith is a brief summary of my experience so far with the Microsoft Silverlight Unit Testing Framework.
We will not go into too much detail on how to use the unit testing framework, but I thought it worth briefly discussing how to set it up and perform asynchronous unit testing with it, since that is directly relevant.
As it turns out, writing unit tests for methods invoked asynchronously is easy with the Silverlight Testing tools. For whatever reason, I believe the Silverlight team has taken the right approach with synchronous web service calls.

In some ways we get the best of both worlds, blocking the UI thread is prohibited, yet we can still fallback to our familiar synchronous model when using background processing. I would like to see the inclusion of a standard mechanism for performing synchronous web service calls from non-UI threads, as there is a legitimate case for them. Daniel Vaughan is a Microsoft MVP and co-founder of Outcoder, a Swiss software and consulting company dedicated to creating best-of-breed user experiences and leading-edge back-end solutions, using the Microsoft stack of technologies--in particular WPF, WinRT, Windows Phone, and also Xamarin.Forms.
Daniel is the author of Windows Phone 8 Unleashed and Windows Phone 7.5 Unleashed, both published by SAMS. Daniel is the developer behind several acclaimed Windows Phone apps including Surfy, Intellicam, and Splashbox; and is the creator of a number of popular open-source projects including Calcium SDK, and Clog. Need to make a custom, digital clock that will run in all major desktop and smartphone browsers?
In this article I'll show you how to perform synchronous web service calls, and introduce you to some types that make performing synchronous calls with generated channel proxies a breeze.
And while I agree that it's critical not to block the UI thread as to maintain an application's responsiveness, I do believe there is a legitimate case for synchronous web service calls on non-UI threads. Well, Silverlight 2 web services still have thread affinity with the UI thread, it's just now there is some behind the scenes processing taking place. It's quite a constraint, and one that may force us to violate implementation visibility by requiring consumers to know that they shouldn't expect to receive a return value, because a web service call may occur. The result, however, is the same as before; the late subscription does not prevent the GetGreetingCompleted handler from being called. I originally dismissed this familiar pattern when I found it blocked indefinitely on the UI thread. The following excerpt shows how to perform a synchronous channel call using a cached service channel. If this is the first time that this service type has been retrieved then a new channel will be created and cached, otherwise a cached channel will be returned. From the Dispatcher we are able to create a DispatcherSynchronizationContext, which allows us to perform synchronous actions on the UI thread as well as asynchronous ones. For this we are able to use the various Initialize overloads in order to assign the context with the UI Dispatcher. When the channel enters a faulted state it is removed from the cache and recreated when it is next requested.
I have been pleased by the quality of the framework, and the Silverlight developers have eaten their own dog food, as they say, with this one. I must admit that I was a bit lazy installing the templates, and rather chose to create a new Silverlight application, reference the assemblies shown below, and amend the Application_Startup method in the App.xaml. While synchronous web service calls are not prohibited, they will cause ones application to become unresponsive if performed from the UI thread.
This tutorial shows you how to employ Javascript functions to communicate in real time with web page elements to get a slick CSS animated clock. Extreme care was taken to enhance all aspects of her comfort and style, while maintaining her pedigree as a true performance yacht. You see, after I ported some of my recent projects from 1.1 to Silverlight 2, I found that not only was the asynchronous model difficult and unnecessary in many situations, it also meant having to rethink the architecture in order to make them async-compatible.
When we call resetEvent.WaitOne(), we are blocking the UI thread, which means the service call never takes place. The Begin[Method] web service call returns immediately, but the underlying WCF call doesn't take place until later, as shown in the following diagram.

But, we can call it in a synchronous manner from a non-UI thread using a ChannelFactory, as the following excerpt shows.
Once the channel is retrieved we use the SynchronousChannelBroker to invoke the Begin and End methods and return the result. An example of this can be seen in the Page class constructor, in the SilverlightExamples project. Thus, we have seen that there is some missing infrastructure that really should be there to prevent us from stepping on our own toes. This information is not to part of the actual content, but it provides information to web browsers (Internet explorer, Firefox, Chrome, Opera, etc).3. For complex scenarios, where background processing is employed, the mandatory asynchronous model is inelegant. With Silverlight 2 RTW, we see that the generated proxies no longer contain the methods for consuming services synchronously. Their omission was not to prevent browser lockups but was, according to Peter Bromberg, to allow for cross-browser support as Silverlight needs to implement the NPAPI plugin model. One might choose to write the service interfaces manually, but the downside might be that we would be introducing yet more code to maintain. A growing population of young as well as experienced professionals and fresh college graduates are taking up entrepreneurship. In the background, the call to client.GetGreetingAsync is actually placed in a message queue, and will only be actioned when the thread is not executing user code. Among start-ups, you find that an overwhelming size belongs to Internet and the online space.
In the next part, we will take it forward and learn some more about using HTML to add various elements such as images, hyperlinks, and lists. In the beginning of the Internet era, any simple HTML website catering to some useful need was considered an achievement. With growing familiarity and increased acceptance of the online space in our daily life means you cannot impress people with simple websites.
Each image tag includes image source URL, alternate text to be shown when image is not available and the title tag for providing information about the image when a user moves the cursor on it. Your users need to find some great use of your website and need to find some value that no one else is offering.Do you need to really create a top of the line website to really started as an online entrepreneur, or rather website owner?
Simple websites can still offer great value to users even now.Let us say you have created a simple HTML website that offers authoritative information and advice regarding a medical condition or some local issue plaguing a sizeable number of people. If your website is really helpful in guiding people and solves their problems, it is likely to be appreciated even if it does not have any attractive design or graphics.
Just the basics are good enough.How to Create a Simple HTML Page?A HTML webpage available online is no different from any simple file saved on your local computer. In this article, I will try to acquaint you with the basic HTML so that you can work on HTML sites with ease.This is the basic structure of all HTML pages.
Here you get to learn various legitimate ways of online ventures and enterprises to earn money online using Internet, your computer and, of course, your hard work.

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