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could potentially consume a significant amount of disk space The developer using TemporaryFileStream can explicitly call Close() to restore the disk space Providing a method for deterministic finalization is important because it eliminates a dependency on the indeterminate timing behavior of the finalizer Even if the developer fails to call Close() explicitly, the finalizer will take care of the call The finalizer will run later than if it was called explicitly, but it will be called Because of the importance of deterministic finalization, the Base Class Library includes a specific interface for the pattern and C# integrates the pattern into the language The IDisposable interface defines the details of the pattern with a single method called Dispose(), which developers call on a resource class to dispose of the consumed resources Listing 921 demonstrates the IDisposable interface and some code for calling it
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Listing 921: Resource Cleanup with IDisposable
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class TemporaryFileStream : IDisposable { public TemporaryFileStream() { _Stream = new FileStream( FileFullName, FileModeOpenOrCreate, FileAccessReadWrite); } ~TemporaryFileStream() { Close(); } public FileStream Stream { get { return _Stream; } private set { _Stream = value; } } private FileStream _Stream; public FileInfo File { get { return _File; } private set { _File = value; } } private FileInfo _File =
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new FileInfo(PathGetTempFileName()); public void Close() { _StreamClose(); FileDelete(); // Turn off calling the finalizer SystemGCSuppressFinalize(this); } #region IDisposable Members public void Dispose() { Close(); } #endregion }
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class Program { // static void Search() { TemporaryFileStream fileStream = new TemporaryFileStream(); // Use temporary file stream; // fileStreamDispose(); // } }
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The steps for both implementing and calling the IDisposable interface are relatively simple However, there are a couple of points you should not forget First, there is a chance that an exception will occur between the time TemporaryFileStream is instantiated and Dispose() is called If this happens, Dispose() will not be invoked and the resource cleanup will have to rely on the finalizer To avoid this, callers need to implement a try/ finally block Instead of coding such a block explicitly, C# provides a using statement expressly for the purpose The resultant code appears in Listing 922
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Listing 922: Invoking the using Statement
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class Program { // static void Search() { using (TemporaryFileStream fileStream1 = new TemporaryFileStream(), fileStream2 = new TemporaryFileStream()) { // Use temporary file stream; } } }
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The resultant CIL code is identical to the code that would be created if there was an explicit try/finally block, where fileStreamDispose() is called in the finally block The using statement, however, provides a syntax shortcut for the try/finally block Within a using statement, you can instantiate more than one variable by separating each variable with a comma The key is that all variables are of the same type and that they implement IDisposable To enforce the use of the same type, the data type is specified only once rather than before each variable declaration
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ADVANCED TOPIC The using Statement Prior to C# 20 Prior to C# 20, you could code a using statement with any type that implemented a Dispose() method, regardless of whether the type explicitly implemented the IDisposable interface In C# 20, however, the using statement requires implementation of the IDisposable interface Garbage Collection and Finalization The IDisposable pattern contains one additional important call Back in Listing 921, the Close() method included a call to SystemGCSuppressFinalize() (captured again in Listing 923) Its purpose was to
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remove the TemporaryFileStream class instance from the finalization (freachable) queue
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Listing 923: Suppressing Finalization
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// public void Close() { _StreamClose(); FileDelete(); // Turn off calling the finalizer SystemGCSuppressFinalize(this); } //
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The f-reachable queue is a list of all the objects that are ready for garbage collection and also have finalization implementations The runtime cannot garbage-collect objects with finalizers until after their finalization methods have been called However, garbage collection itself does not call the finalization method Rather, references to finalization objects are added to the f-reachable queue, thereby ironically delaying garbage collection This is because the f-reachable queue is a list of references, and as such, the objects are not garbage until after their finalization methods are called and the object references are removed from the f-reachable queue
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