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A ReaderWriterLock selectively allows access to data It allows multiple threads to acquire a reader lock, which is acquired when the thread will be performing only read operations Nothing keeps an errant thread from acquiring a reader lock and performing write operations Care should be taken to ensure that only read operations occur in a region guarded by a read lock The power of a ReaderWriterLock is that it allows read operations to be logically separated from write operations Since multiple read operations do not result in data corruption, there is no reason that multiple threads cannot simultaneously read a variable without ill effects To acquire a read lock, we invoke the AcquireReadLock method on the instance of the lock we wish to acquire AcquireReadLock accepts a timeout value as its only parameter.

Specifies the roles allowed to read a property Specifies the roles not allowed to read a property Specifies the roles allowed to write to a property Specifies the roles not allowed to write to a property Specifies the roles allowed to execute a method Specifies the roles not allowed to execute a method

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The functionality contained in BindingSourceHelper could have resided in BindingSourceNode as a static method, but it made more sense to separate these two classes out in the interest of maintaining a strict separation of the node class from the class that creates the actual tree The design also allows for future enhancements to be added to the BindingSourceHelper class while maintaining a clean BindingSourceNode class Usage of these classes is quite simple and can save you lots of confusing code In a conventional Windows Forms binding situation, you set up your BindingSource components declaratively and then set the DataSource property of the root BindingSource component to the top-level business object This step is taken care of automatically if you re using the new components, in which case you obtain an instance of a BindingSourceNode class by calling the InitializeBindingSourceTree() method from the BindingSourceHelper component.

As with many other synchronization methods, the timeout can either be an integer specifying the number of milliseconds to wait or an instance of the TimeSpan class In listing 91, we pass in the constant TimeoutInfinite to indicate we wish to wait indefinitely until we are able to acquire a read lock We are assured that when the method returns we have acquired a read lock As a general rule, using TimeoutInfinite is a bad idea A better approach is to supply a timeout value because it removes the possibility of a ReaderWriterLock-related deadlock To keep this chapter s examples simple, we use TimeoutInfinite Once a thread has acquired a read lock, it can perform any reads that are required, and once those reads are complete it should release the lock using the ReleaseReadLock method.

dynamic wordDocument = word.Documents.Add(); //setting up some properties for the Document dynamic range = wordDocument.Range(0, 0); dynamic table = wordDocument.Tables.Add(range, 5, 4); //some property setting on table table.ApplyStyleHeadingRows = true; table.AllowAutoFit = true; //setting header table.Cell(1, 1).Range.Text table.Cell(1, 2).Range.Text table.Cell(1, 3).Range.Text table.Cell(1, 4).Range.Text int j = 2; foreach (BookInfo { table.Cell(j, table.Cell(j, table.Cell(j, table.Cell(j, j++; } } Note that as you type code, you won t get IntelliSense support. However, Visual Studio Object Browser can bring help in this situation. You can create separate a Windows Application project and then add reference to Microsoft Word 14.0 Object Library and Microsoft Excel 14.0 Object Library using the COM tab in the Add Reference dialog box. Note that I am using Office 2010, so the library version may differ for your system. Now you can see various members of the added Office library using Object Browser, which will help you to develop code for COM access in your Silverlight application. Run the project. Figure 11-18 shows the screen when I choose Export to Excel, and Figure 11-19 shows the screen when Export to Word is clicked. = = = = "Title"; "Author"; "ISBN"; "URL";

The number of calls to ReleaseReadLock must match the number of calls to AcquireReadLock If a thread fails to release the lock the same number of times it acquires the lock a write lock will not be granted to other threads This will lead to deadlock if TimeoutInfinite is being used, as well as stopping the granting of any write locks..

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