Performing Local Operations in C#

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Performing Local Operations
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Even in situations where processing occurs locally, some operations may take enough time to negatively affect the responsiveness of your application. Such operations include: Image rendering Data manipulation Data sorting Searching You should not perform operations such as these on the UI thread because doing so causes performance problems in your application. Instead, you should use an additional thread to perform these operations asynchronously and prevent the UI thread from blocking. In many cases, you should also design the application so that it reports the progress and success or failure of ongoing background operations. You may also consider allowing the user to cancel background operations to improve usability.
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6: Using Multiple Threads
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Distinguishing Tasks of Varying Priority
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Not all of the tasks your application has to perform will be of the same priority. Some tasks will be time critical, and others will not. In other cases, you may find that one thread is dependent on the results of processing on another thread. You should create threads of different priorities to reflect the priorities of the tasks they are performing. For example, you should use a high-priority thread to manage time-critical tasks, and a low-priority thread to perform passive tasks or tasks that are not time-sensitive.
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Your application often has to perform a number of operations when it first runs. For example, it may need to initialize its state, retrieve or update data, and open connections to local resources. You should consider using a separate thread to initialize your application, allowing the user to start using the application as soon as possible. Using a separate thread for initialization increases your application s responsiveness and usability. If you do perform initialization on a separate thread, you should prevent the user from initiating operations that depend on initialization being completed, by updating the UI menu and toolbar button state after initialization is complete. You should also provide clear feedback that notifies users of the initialization progress.
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Creating and Using Threads
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There are several ways that you can create and use background threads in the .NET Framework. You can use the ThreadPool class to access the pool of threads managed by the .NET Framework for a given process, or you can use the Thread class to explicitly create and manage a thread. Alternatively, you can use delegate objects or a Web service proxy to cause specific processing to occur on a non-UI thread. This section examines each of these different methods in turn and makes recommendations about when each should be used.
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Using the ThreadPool Class
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By now you probably realize that many of your applications would benefit from multithreading. However, thread management is not just a question of creating a new thread each time you want to perform a different task. Having too many threads can cause an application to use an unnecessary number of system resources, particularly if you have a large number of short-running operations, all of which are running on separate threads. Also, managing a large number of threads explicitly can be very complex.
Smart Client Architecture and Design Guide
Thread pooling solves these problems by providing your application with a pool of worker threads that are managed by the system, allowing you to concentrate on application tasks rather than thread management. Threads can be added to the thread pool as required by the application. When the CLR initially starts, the thread pool contains no additional threads. However, as your application requests threads, they are dynamically created and stored in the pool. If threads are not used for some time, they can be disposed of, so the thread pool shrinks and grows according to the demands of the application.
Note: One thread pool is created per process, so if you run several application domains within the same process, an error in one application domain can affect the rest within the same process because they use the same thread pool.
A thread pool consists of two types of threads: Worker threads. The worker threads are part of the standard system pool. They are standard threads managed by the .NET Framework, and most functions are executed on them. Completion port threads. This kind of thread is used for asynchronous I/O operations, using the IOCompletionPorts API.
Note: If the application is trying to perform I/O operations with a computer that does not have IOCompletionPorts functionality, it will revert to using worker threads.
The thread pool contains a default of 25 threads per computer processor. If all 25 threads are being used, additional requests queue until a thread becomes available. Each thread uses the default stack size and runs at the default priority. The following code example shows the use of a thread pool.
private void ThreadPoolExample() { WaitCallback callback = new WaitCallback( ThreadProc ); ThreadPool.QueueUserWorkItem( callback ); }
In the preceding code, you first create a delegate to reference the code you want executed on a worker thread. The .NET Framework defines the WaitCallback delegate, which references a method that takes a single object parameter and returns no values. The following method implements the code you want executed.
private void ThreadProc( Object stateInfo ) { // Do something on worker thread. }
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