c# generating barcode Silverlight in Visual Studio .NET

Printing Quick Response Code in Visual Studio .NET Silverlight

10 Silverlight
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is considered a Microsoft platform even if your Silverlight application is running in a non-Microsoft operating system . And, my Power Threading library does have a version of this class for Silverlight as well as the Microsoft .NET Compact Framework .
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29 Hybrid Thread Synchronization
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"Echo", PipeDirection.InOut, -1, PipeTransmissionMode.Message, PipeOptions.Asynchronous | PipeOptions.WriteThrough)) { // Asynchronously accept a client connection pipe.BeginWaitForConnection(ae.End(), null); yield return 1; // A client connected, let's accept another client var aeNewClient = new AsyncEnumerator(); aeNewClient.BeginExecute( PipeServerAsyncEnumerator(aeNewClient), aeNewClient.EndExecute); // Accept the client connection pipe.EndWaitForConnection(ae.DequeueAsyncResult()); // Asynchronously read a request from the client Byte[] data = new Byte[1000]; pipe.BeginRead(data, 0, data.Length, ae.End(), null); yield return 1; // The client sent us a request, process it. Int32 bytesRead = pipe.EndRead(ae.DequeueAsyncResult()); // Get the timestamp of this client's request DateTime now = DateTime.Now; // We want to save the timestamp of the most recent client request. Since multiple // clients are running concurrently, this has to be done in a thread-safe way s_gate.BeginRegion(SyncGateMode.Exclusive, ae.End()); // Request exclusive access yield return 1; // The iterator resumes when exclusive access is granted if (s_lastClientRequestTimestamp < now) s_lastClientRequestTimestamp = now; s_gate.EndRegion(ae.DequeueAsyncResult()); // Relinquish exclusive access
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// My sample server just changes all the characters to uppercase // But, you can replace this code with any compute-bound operation data = Encoding.UTF8.GetBytes( Encoding.UTF8.GetString(data, 0, bytesRead).ToUpper().ToCharArray()); // Asynchronously send the response back to the client pipe.BeginWrite(data, 0, data.Length, ae.End(), null); yield return 1; // The response was sent to the client, close our side of the connection pipe.EndWrite(ae.DequeueAsyncResult()); } // Close the pipe }
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Part V
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The Concurrent Collection Classes
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The FCL ships with four thread-safe collection classes, all of which are in the System. Collections.Concurrent namespace . ConcurrentQueue, ConcurrentStack, and ConcurrentDictionary are in MSCorLib .dll, while ConcurrentBag is in System .dll . Here is what some of their most commonly used members look like:
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// Process items in a first-in, first-out order (FIFO) public class ConcurrentQueue<T> : IProducerConsumerCollection<T>, IEnumerable<T>, ICollection, IEnumerable { public public public public public ConcurrentQueue(); void Enqueue(T item); Boolean TryDequeue(out T result); Int32 Count { get; } IEnumerator<T> GetEnumerator();
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} // Process items in a last-in, first-out order (LIFO) public class ConcurrentStack<T> : IProducerConsumerCollection<T>, IEnumerable<T>, ICollection, IEnumerable { public public public public public ConcurrentStack(); void Push(T item); Boolean TryPop(out T result); Int32 Count { get; } IEnumerator<T> GetEnumerator();
} // An unordered set of items where duplicates are allowed public class ConcurrentBag<T> : IProducerConsumerCollection<T>, IEnumerable<T>, ICollection, IEnumerable { public public public public public ConcurrentBag(); void Add(T item); Boolean TryTake(out T result); Int32 Count { get; } IEnumerator<T> GetEnumerator();
} // An unordered set of key/value pairs public class ConcurrentDictionary<TKey, TValue> : IDictionary<TKey, TValue>, ICollection<KeyValuePair<TKey, TValue>>, IEnumerable<KeyValuePair<TKey, TValue>>, IDictionary, ICollection, IEnumerable { public ConcurrentDictionary(); public Boolean TryAdd(TKey key, TValue value); public Boolean TryGetValue(TKey key, out TValue value); public TValue this[TKey key] { get; set; } public Boolean TryUpdate(TKey key, TValue newValue, TValue comparisonValue); public Boolean TryRemove(TKey key, out TValue value); public TValue AddOrUpdate(TKey key, TValue addValue, Func<TKey, TValue> updateValueFactory); public TValue GetOrAdd(TKey key, TValue value); public Int32 Count { get; } public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator(); }
29 Hybrid Thread Synchronization
All these collection classes are non-blocking . That is, if a thread tries to extract an element when no such element exists, the thread returns immediately; the thread does not block waiting for an element to appear . This is why methods like TryDequeue, TryPop, TryTake, and TryGetValue all return true if an item was obtained and false if not . These non-blocking collections are not necessarily lock-free . The ConcurrentDictionary class uses Monitor internally, but the lock is held for a very short time while manipulating the item in the collection . ConcurrentQueue and ConcurrentStack are lock-free; these both internally use Interlocked methods to manipulate the collection . A single ConcurrentBag object internally consists of a mini-collection object per thread . When a thread adds an item to the bag, Interlocked methods are used to add the item to the calling thread s minicollection . When a thread tries to extract an element from the bag, the bag checks the calling thread s mini-collection for the item . If the item is there, then an Interlocked method is used to extract the item . If the thread s mini-collection doesn t have the item, then a Monitor is taken internally to extract an item from another thread s mini-collection . We say that the thread is stealing the item from another thread . You ll notice that all the concurrent classes offer a GetEnumerator method, which is typically used with C# s foreach statement but can also be used with Language Integrated Query (LINQ) . For the ConcurrentStack, ConcurrentQueue, and ConcurrentBag, the GetEnumerator method takes a snapshot of the collection s contents and returns elements from this snapshot; the contents of the actual collection may change while enumerating over the snapshot . ConcurrentDictionary s GetEnumerator method does not take a snapshot of its contents, so the contents of the dictionary may change while enumerating over the dictionary; beware of this . Also note that the Count property returns the number of elements that are in the collection at the moment you query it . The count may immediately become incorrect if other threads are adding or removing elements from the collection at the same time . Three of the concurrent collection classes, ConcurrentStack, ConcurrentQueue, and ConcurrentBag, implement the IProducerConsumerCollection interface, which is defined as follows:
public interface IProducerConsumerCollection<T> : IEnumerable<T>, ICollection, IEnumerable { Boolean TryAdd(T item); Boolean TryTake(out T item); T[] ToArray(); void CopyTo(T[] array, Int32 index); }
Any class that implements this interface can be turned into a blocking collection where threads producing (adding) items will block if the collection is full and threads consuming (removing) items will block if the collection is empty . Of course, I d try to avoid using blocking collections as their purpose in life is to block threads . To turn a non-blocking collection into a blocking collection, you construct a System.Collections.Concurrent.
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