c# validate gtin Method Invocations and Event Management with .NET Remoting in C#.NET

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Method Invocations and Event Management with .NET Remoting
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1. Which is true of objects that use the OneWay attribute (Select all that apply.) A. Each method that requires fire and forget functionality should be deco rated with the OneWay attribute. B. If an interface is used, each method that will be implemented in a fire and forget manner should be decorated with the OneWay attribute. C. The code block containing the call to a fire and forget method must be marked with the OneWay attribute. D. The OneWay attribute is not necessary so long as the method will be invoked via a delegate. 2. How do asynchronous methods differ from traditional ones (Select all that apply.) A. They have a different signature and return type in most cases. B. Other methods can be processed while the call to the remoting method is processing. C. The Completed event must be handled to get the results back. D. The method call is for all intents and purposes identical to the synchronous counterpart, other than the way in which it is invoked.
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Lesson 2: Callbacks and Remoting
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Lesson 2: Callbacks and Remoting
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In the previous lesson, we were introduced to both synchronous and asynchronous invocations of remoting calls. In this lesson, we delve a little deeper into the process of asynchronous invocations. In particular, we cover the following:
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Checking for completion using the IsCompleted method. Using an AsyncCallback object.
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After this lesson, you will be able to:
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Use a delegate to invoke a remoting method. Check the state of completion and respond accordingly.
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Estimated lesson time: 45 minutes
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Real World
William Ryan Totally changing the architecture of the application referenced in the previous Real World example was a great move, but it was not without some problems along the way. One problem was with interface responsiveness. The same appli cation server used to serve data to the ASP.NET application was also used to serve data to our internal applications. Because everything was done synchro nously, the user interface froze quite a bit. Thanks to implementing asynchro nous techniques and callbacks, we then had a much more responsive application, which users greatly appreciated.
Polling
When a method is called asynchronously, you don t really know when it has reached completion. Typically, programs execute in a linear fashion, but that s not the case with asynchronous calls. Consider the following situation: A call is made to a given method of a remote object. Next, another call is made to a different method, one that uses the return value from the first call as a parameter for the second call. In a synchronous scenario, you can be sure that the second call will not execute until the first is completed. In an asynchronous scenario, you don t know when any of the methods are going to return and you certainly can t count on them finishing in the
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Method Invocations and Event Management with .NET Remoting
sequence in which they were called. (If they do finish in the sequence in which they were called, it s only due to random chance.)
Determining Whether an Asynchronous Call Has Finished
In the last part of Lesson 1, a simple example invoked the FirstName and LastName methods of the Person class. However, in that example, the client code wasn t con cerned with the return values from either of those methods. In fact, the example essentially ignored the return values because we were trying to show that processing truly occurred asynchronously. If, however, the calling code was unable to use return values whenever it invoked a method asynchronously, the usefulness of asynchro nous calls would be severely limited. After all, methods that return values that will be consumed by the client are just as likely as ones that won t take a long time to com plete. If you had to hold up processing every time you needed a value back from a remote method, you d require a Herculean effort just to decide when and when not to use a method. Not only can you retrieve a value from an asynchronous call if you need it, but there are several ways to accomplish the retrieval. We saw in 7 that to use an IAsyncResult object to perform an asynchronous invocation, a delegate object that matched the method s signature was necessary. After this matching delegate was in place, all that was necessary to perform the asyn chronous invocation was calling the BeginInvoke method of the delegate, passing in the function s name, and in our example, two null parameters. In the simplest asyn chronous return value retrieval scenario, all that is necessary is to call the EndInvoke method of the delegate, passing in the IAsyncResult object as a parameter. Assuming the same implementation of IPerson and Person that was used in the first example in Lesson 1, all that is needed to get the return values from FirstName and LastName is the following modification (new code is highlighted in bold):
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