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you how to use the Match class s IsSuccess property and its NextMatch method to iter ate over all the matches in a string. You must pay special attention when the search pattern matches an empty string, for example, \d* (which matches zero or more digits). When you apply such a pattern to a string, you typically get one or more empty matches, as you can see here:

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A library which supports decoding and generating of barcodes (like QR Code , PDF 417, EAN, UPC, Aztec, Data Matrix, Codabar) within images. The project is a port of the java based barcode reader and generator library ZXing . It has been ported by hand with a lot of optimizations and improvements.

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mechanism (such as the command notification mechanism of SQL Server), you just use it. Otherwise, to detect changes in the monitored data source, you can only poll the resource at a reasonable rate.

Dim re As New Regex( \d* ) For Each m As Match In re.Matches( 1a23bc456de789 ) The output from this loop shows that some matches are empty. Console.Write(m.Value & , ) => 1,,23,,456,,,789,, Next

To better understand the concept of custom dependencies, think of the following example. You need to cache the inner text of a particular node in an XML file. You can define a custom dependency class that caches the current value upon instantiation and reads the file periodically to detect changes. When a change is detected, the cached item bound to the dependency is invalidated. Note Admittedly, polling might not be the right approach for this particular problem. Later on,

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If you need to use different credentials to create the Reporting Services databases, you can use the command-line executable Setup.exe instead of the setup wizard to pass those credentials to the installation process.

in fact, I ll briefly discuss a more effective implementation. Be aware, though, that polling is a valid and common technique for custom cache dependencies.

As I explained earlier, a search generally starts where the previous search ends. However, the rule is different when the engine finds an empty match because it advances by one character before repeating the search. You would get trapped in an endless loop if the engine didn t behave this way. If the pattern contains one or more groups, you can access the corresponding Group object by means of the Match object s Groups collection, which you can index by the group number or group name. I ll discuss the Group object in a moment, but you can already see how you can use the Groups collection to extract the variable names and values in a series of assignments:

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A good way to poll a local or remote resource is through a timer callback. Let s break the procedure into a few steps: 1. The custom XmlDataCacheDependency class gets ready for the overall functionality. It initializes some internal properties and caches the polling rate, file name, and XPath expression to find the subtree to monitor. 2. After initialization, the dependency object sets up a timer callback to access the file periodically and check contents. 3. In the callback, the return value of the XPath expression is compared to the previously stored value. If the two values differ, the linked cache item is promptly invalidated. There s no need for the developer to specify details about how the cache dependency is broken or set up. The CacheDependency class takes care of it entirely. Note If you re curious to know how the Cache detects when a dependency is broken, read

Dim source As String = a = 123: b=456"

on. When an item bound to a custom dependency object is added to the Cache, an additional entry is created and linked to the initial item. NotifyDependencyChanged simply invalidates this additional element which, in turn, invalidates the original cache item.

Dim re As New Regex( (\s*)( <name>\w+)\s*=\s*( <value>\d+) )

The following source code shows the core implementation of the custom XmlDataCacheDependency class:

For Each m As Match In re.Matches(source)

public class XmlDataCacheDependency : CacheDependency { // Internal members static Timer _timer; Int32 _pollSecs = 10; String _fileName; String _xpathExpression; String _currentValue; public XmlDataCacheDependency(String file, String xpath, Int32 pollTime) { // Set internal members _fileName = file; _xpathExpression = xpath; _pollSecs = pollTime; // Get the current value _currentValue = CheckFile();

Console.WriteLine( Variable: {0} Value: {1}", _ m.Groups( name ).Value, m.Groups( value ).Value) Next

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