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Use the System.Text.RegularExpressions.Regex class. Use the members of the System.String class.
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[EditorBrowsable(EditorBrowsableState.Advanced)] protected virtual object GetClone() { return ObjectCloner.Clone(this); } Notice that neither of these methods is public. The only way to invoke this Clone() method is through the ICloneable interface. Later in the chapter, BusinessBase<T> will implement a strongly typed public Clone() method by virtue of being a generic type. The GetClone() method is protected in scope to allow customization of the cloning process by a business developer. While a straight copy of the object is typically the required behavior, sometimes a business object needs to do extra work when creating a clone of itself.
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Unlike a C++ destructor, a C# destructor is not called immediately when an instance goes out of scope. In fact, there is no way of knowing when the destructor will be called. Furthermore, as previously mentioned, you cannot explicitly call a destructor. If your code needs a destructor, you must provide it for the system, which will call it at some point before the object is removed from the managed heap. If your code contains unmanaged resources that need to be released in a timely manner, you should not leave that for the destructor, since there is no guarantee that the destructor will run any time soon. Instead, you should adopt the standard pattern where your classes implement what is called the IDisposable interface. (I ll cover interfaces in 17.) This consists of encapsulating the cleanup code for these resources in a void, parameterless method, which you should call Dispose. When you re done with the resources and want them released, you need to call Dispose. Notice that it is you who needs to call Dispose not the destructor. The system will not call it for you automatically. Some guidelines for your Dispose method are the following: Implement the code in Dispose in such a way that it is safe for the method to be called more than once. If it has already been called, then on any subsequent invocations it should not raise an exception or do any additional work. (Exceptions are covered in 11.) Write your Dispose method and destructor such that, if for some reason your code doesn t get to call Dispose, your destructor will call it and release the resources. Since Dispose is doing the cleanup rather than the destructor, it should call the GC.SuppressFinalize method, which tells the CLR not to call this object s destructor, because it has already been taken care of. The following code describes the safe disposal process. First, the class needs to declare a Boolean disposed field to keep track of whether the cleanup has occurred or not. This is initialized to false when the object is created. Inside the Dispose method, do the following: Check the flag to see whether the resources have already been released. If not, then do the following: Call the Dispose methods on any managed resources that require it. Release any unmanaged resources held by the object. Now that the disposal has occurred, set the disposed flag to true. Finally, call the garbage collector s SuppressFinalize method to tell the garbage collector not to call the class s destructor.
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Before you can create or use workflows, you must first install the Windows Workflow Foundation or be running Windows Vista. Even if you re running Windows Vista as an operating system, you must install the Workflow Designers for VS2005. If you re running an operating system other than Windows Vista, you need to install the Visual Studio 2005 Extensions for Windows Workflow Foundation. This installation package includes the VS Workflow Designers, the WF SDK, and the WF runtime components. The installation is self-explanatory, so I won t walk through it here. When the package is installed, two new programs will appear in the Add/Remove Programs within the Control Panel. The first is the Visual Studio 2005 Extensions for Windows Workflow Foundation. These are the Workflow Designers that are part of VS2005. The other program is the Windows Workflow Foundation, which is an add-on to the .NET Framework 2.0 and contains the components mentioned earlier. As soon as the Visual Studio 2005 Extensions for Windows Workflow Foundation is installed, you can open VS2005 and find new projects. When you open VS2005, click File New Project. When the New Project window appears, click the plus sign next to your favorite programming language, such as VB. Notice when the project types list is expanded, there s a new project type called Workflow. When you click the Workflow project type, you ll see the new project templates (see Figure 1-1).
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At the 2008 PDC Anders Hejlsberg noted that many developers were creating programs that created programs (meta programming). Anders considered it would be useful to expose compiler methods to developers to give them complete control over compilation. In a future version of .NET the compiler will be written in managed code and certain functions made accessible to the developer. Anders then demonstrated an example of this by showing a REPL (Read Evaluate Print Loop) C# application.
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Figure 1-7. The Business Bar shows information about pending workflow tasks so the user always knows what they need to do. Clicking the Open link on the Business Bar will present the user with information related to the workflow task they have been assigned and give them the opportunity to directly complete and modify that task. The user s experience will depend on which components of the Office 2007 System are installed in their environment. Clicking the Edit this task button will launch a browser. The task information will be presented as an ASPX page, as shown in Figure 1-8. This is the only option available if only WSS is installed.
// Declare class // Declare field Mem1; } x; }
4.10. Showing Zero in Empty Values Cells
For example, the following code shows the use of operators Count and First. Both operators take only a single parameter the reference to the IEnumerable<T> object. The Count operator returns a single value that is the count of all the elements in the sequence. The First operator returns the first element of the sequence. The first two times the operators are used in this code, they are called directly, just like normal methods, passing the name of the array as the first parameter. In the following two lines, however, they are called using the extension method syntax, as if they were method members of the array, which is enumerable. Notice that in this case no parameter is supplied. Instead, the array name has been moved from the parameter list to before the method name. There it is used as if it contained a declaration of the method. The direct syntax calls and the extension syntax calls are completely equivalent in effect only their syntax is different. using System.Linq; ... static void Main( ) { int[] intArray = new int[] { 3, 4, 5, 6, 7, 9 }; Array as parameter var count1 = Enumerable.Count(intArray); // Called directly var firstNum1 = Enumerable.First(intArray); // Called directly var count2 = intArray.Count(); // Called as extension var firstNum2 = intArray.First(); // Called as extension Array as extended object Console.WriteLine("Count: {0}, FirstNumber: {1}", count1, firstNum1); Console.WriteLine("Count: {0}, FirstNumber: {1}", count2, firstNum2); } This code produces the following output: Count: 6, FirstNumber: 3 Count: 6, FirstNumber: 3
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