Data Access in .net C#

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CHAPTER 1 DIS TRIBUTED ARC HITE CTURE
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As you descend into the details of moving your interdependent lists into a control of their own, more issues will arise. What if someone uses two instances of your control on a page of her own You d have duplicate populateListB methods injected into the page, which would not make the browser happy. What if you wanted the static parts of your code in their own file (.js) How can you be sure to inject this only once The Page object has a number of types and methods designed to help with just such problems.
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while( TestExpr ) Statement
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Task.Factory.StartNew((stateObject) => { int taskID = (int)stateObject; long total = 0; for (int j = 0; j < int.MaxValue; j++) { total = CalculateSum(taskID, j, total); } Console.WriteLine("Task {0} ran to completion", taskID); }, i); } // prompt the user to press enter to run the GC Console.WriteLine("Press enter to run GC"); Console.ReadLine(); // run the GC GC.Collect(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } public static long CalculateSum(int taskID, int x, long y) { if (taskID % 2 == 0 && x == 1000) { Console.WriteLine("Throwing an exception for Task {0}", taskID); throw new Exception(string.Format("Exception for taskID {0}", taskID)); } else { return x + y; } } } The custom policy in Listing 24-18 is shown in bold. You register with the UnobservedTaskException event; when exceptions are not handled using the other techniques, your policy will be used by invoking your event handler. You can learn more about events and event handling in 10. The UnobservedTaskExceptionEventArgs class (from the System.Threading.Tasks namespace) is used to pass details of the unhandled exceptions to your policy code. The Exception property returns an AggregateException containing the unhandled exceptions, although you will need to cast to the AggregateException type before you can access the inner exceptions. The SetObserved method tells the TPL that your custom policy has handled the exception and that no further action is required. The default escalation policy will be used if you don t call the SetObserved method in your custom policy, allowing you to decide to selectively handle exceptions. The custom policy shown in Listing 24-18 calls the SetObserved method and enumerates the aggregated exceptions. The rest of Listing 24-18 creates a set of Tasks, some of which run to completion and some of which encounter exceptions. When the user presses the Enter key, the garbage collector is explicitly called, which causes the Task objects to be finalized (this assumes that the user doesn t press the Enter key until all of the Tasks have finished). The finalization of the Task objects causes the unhandled exceptions to be escalated to the custom policy. Compiling and running Listing 24-18 produces the following results: Press enter to run GC
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Factory Methods
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Converting Between Managed and Native Strings
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The HTTP and TCP protocols have one thing in common, which is that they both enable messaging between remote components that are running on separate processes and on separate domains. TCP is a lower-level protocol that operates on a port rather than a virtual directory, which is a higher-level abstraction of a port. HTTP is designed for Request/Response messaging patterns, meaning that a request generates a direct response. TCP is designed for decoupled messaging patterns whereby a sender and a receiver communicate, but not necessarily as a two-way conversation. TCP enables asynchronous messaging, whereby the sender releases its calling thread as soon as the message has been delivered to the receiver. By extension, TCP also enables one-way messaging, because once a sender mails out a message, its resources are released, and the sender suffers no resource or scalability problems waiting for a response that will never come. This is the beauty of the decoupled TCP protocol: You can implement a Request/ Response messaging pattern if you want to, but unlike with HTTP, you do not have to.
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CHAPTER 34 ASP.NET
The CriteriaBase class supports the creation of custom criteria objects as described in 5. Custom criteria classes must implement the ICriteria interface, and CriteriaBase merely simplifies that process. The ICriteria interface ensures that a custom criteria object can provide the data portal with the Type object representing the type of business object to be created, retrieved, or deleted. SingleCriteria is a subclass of CriteriaBase. I discuss it later in this chapter. The Criteria class is defined like this: [Serializable] public class CriteriaBase : Csla.Core.MobileObject, ICriteria
If you are familiar with Java, you might have been excited when you read that .NET uses a virtual machine and assumed that .NET can run on multiple platforms. After all, virtual machines are a common approach to platform independence. But .NET is a Microsoft technology, which means that there is a serious gravitational pull between the features of .NET and the features of Windows and other Microsoft products. If you are using C# and .NET, you are probably expecting to deploy your program to Windows and that s not a bad thing. Windows and Windows Server are extremely competent operating systems and having one producer control the entire technology chain has some benefits. Of course, it has some drawbacks as well, but that s a topic for another day. That said, there are two ways in which .NET runs on other platforms. The first is Silverlight, which runs on Windows and Mac OS X computers. You don t get access to all of the .NET Framework Class Library with Silverlight, but you do get the basics, and if you want to reach non-Windows users (and there can be quite a few depending on the market segment you are after), then Silverlight might be the answer you are looking for. I introduce Silverlight in 35 and you should probably read 33, which describes the WPF used by Silverlight for user interfaces. A more comprehensive approach is Mono, details of which can be found at http://monoproject.com. Mono is an open source implementation of the .NET Framework that runs on a range of operating systems, including the common Linux distributions, Solaris, and Mac OS X. Mono tends to lag
CHAPTER 3 FILES
Logical I/O
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