winforms data matrix reader

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Like all of the Enterprise Library application blocks, the Exception Handling block is extensible. You can create new exception handlers and exception formatters if you need to perform specific tasks that the block does not implement by default. For example, you could create an exception handler that displays the exception details in a dialog, creates an XML message, or generates a Web page. All that is required is that you implement the IExceptionHandler interface defined within the block. This interface contains one method named HandleException that the Exception Handling block will execute when you add your handler to a policy chain. The Exception Handling block uses formatters to create the message sent to the Logging block when you use a Logging handler. The two formatters provided are the TextExceptionFormatter and the XmlExceptionFormatter. The TextException Formatter generates a simple text format for the error message, as you have seen in the previous sections of this chapter. The XmlExceptionFormatter generates, as you would expect, an XML-formatted document as the error message. You can create custom formatters if you want to control the exact format of this information. You simply create a new class that derives from the ExceptionFormatter base class in the Exception Handling block, and override the several methods it contains for formatting the exception information as required.

number of digits outputted depends on the enum s underlying type: 2 digits for byte/sbyte, 4 digits for short/ushort, 8 digits for int/uint, and 16 digits for long/ulong . Leading zeros are outputted if necessary .

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Your bosses have already spoken with me and have asked that you not start jumping into assembly language every chance you get It's not portable and can make maintenance much harder The Basics of the CPU The Intel instruction set has been around for quite a while and has its roots in the 8086 CPU that Intel first released in 1978 In the days of MS-DOS and 16-bit Microsoft Windows, assembly language used to be a little quirky and hard to use because of the way the CPU handled memory, which was through 64 KB blocks of memory called segments Fortunately, today on Windows operating systems, the CPU has direct access to the entire address space, which means that assembly language is much easier to deal with.

Multiple event handler methods can be registered with this event . Each method can process the contract violation any way it chooses . For example, a handler can log the violation, ignore the violation (by calling SetHandled), or terminate the process . If any method calls SetHandled, then the violation will be considered handled and, after all the handler methods return, the application code is allowed to continue running unless any handler calls SetUnwind . If a handler calls SetUnwind, then, after all the handler methods have completed running, a System.Diagnostics.Contracts.ContractException is thrown . Note that this type is internal to MSCorLib .dll and therefore you cannot write a catch block to catch it explicitly . Also note that if any handler method throws an unhandled exception, then the remaining handler methods are invoked and then a ContractException is thrown . If there are no event handlers or if none of them call SetHandled, SetUnwind, or throw an unhandled exception, then default processing of the contract violation happens next . If the CLR is being hosted, then the host is notified that a contract failed . If the CLR is running an application on a non-interactive window station (which would be the case for a Windows service application), then Environment.FailFast is called to instantly terminate the process . If you compile with the Assert On Contract Failure option checked, then an assert dialog box will appear allowing you to connect a debugger to your application . If this option is not checked, then a ContractException is thrown . Let s look at a sample class that is using code contracts:

The assembly language that I'll be introducing here will be the basic 32-bit instruction set that is compatible across all x86 architecture CPUs from both Intel and AMD and is also referred to as IA32 The advanced features on the Intel Pentiums, such as MMX, aren't generally an issue because Windows uses relatively few such features I won't get into the real grungy parts of assembly-language instruction formats such as the ModR/M and SIB bytes, which both indicate ways to access memory For the purposes of this chapter, memory access is memory access I also won't be covering floating-point instructions Operations on the Intel CPU floating-point unit (FPU) are similar to normal instructions The main differences are that the FPU has its own set of registers and the floating-point instructions use a register stack based architecture.

System.Object o = new System.Object(); // Creates a new Object object Employee e = o as Employee; // Casts o to an Employee // The cast above fails: no exception is thrown, but e is set to null. e.ToString(); // Accessing e throws a NullReferenceException.

C# FundAddedEvent fundAddedEvent = this.eventAggregator.GetEvent<FundAddedEvent>(); fundAddedEvent.Subscribe(FundAddedEventHandler, ThreadOption.PublisherThread); fundAddedEvent.Unsubscribe(FundAddedEventHandler);

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