qr code generator c# asp.net PART II in Visual C#.NET

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PART II
Painting Quick Response Code In Visual C#
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Decode QR Code ISO/IEC18004 In Visual C#.NET
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Part II:
Encoding Barcode In Visual C#
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Exploring the C# Library
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Creating QR Code In Visual Studio .NET
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Show("Initial content of setB: ", setB); setASymmetricExceptWith(setB); Show("setA after Symmetric difference with SetB: ", setA); setAUnionWith(setB); Show("setA after union with setB: ", setA); setAExceptWith(setB); Show("setA after subtracting setB: ", setA); ConsoleWriteLine(); } }
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The output is shown here:
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Initial content of setA: A B C Initial content of setB: C D E setA after Symmetric difference with SetB: A B D E setA after union with setB: A B D E C setA after subtracting setB: A B
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SortedSet<T>
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SortedSet<T> is a new collection added to the NET Framework by version 40 It supports a collection that implements a sorted set SortedSet<T> implements the ISet<T>, ICollection, ICollection<T>, IEnumerable, IEnumerable<T>, ISerializable, and IDeserializationCallback interfaces SortedSet<T> implements a set in which all elements are unique In other words, duplicates are not allowed SortedSet<T> implements the full complement of set operations defined by ISet<T>, such as intersection, union, and symmetric difference Because SortedSet<T> maintains its elements in sorted order, it is the collection of choice when working with sorted sets SortedSet<T> is a dynamic collection that grows as needed to accommodate the elements it must store Here are four commonly used constructors defined by SortedSet<T>: public SortedSet( ) public SortedSet(IEnumerable<T> collection) public SortedSet(IComparer comparer) public SortedSet(IEnumerable<T> collection, IComparer comparer) The first form creates an empty set The second creates a set that contains the elements of the collection specified by collection The third lets you specify the comparer The fourth creates a set that contains the elements in the collection specified by collection and uses the comparer specified by comparer There is also a fifth constructor that lets you initialize a set from serialized data Because SortedSet<T> implements ISet<T>, it provides a compete assortment of set operations Other set-related methods provided by SortedSet<T> include GetViewBetween( ), which returns a portion of a set in the form of a SortedSet<T>, RemoveWhere( ), which removes elements from a set that satisfy a specified predicate, and Reverse( ), which returns an IEnumerable<T> that cycles through the set in reverse order In addition to the properties defined by the interfaces that it implements, SortedSet<T> adds those shown here:
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25:
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Collections, Enumerators, and Iterators
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public IComparer<T> Comparer { get; } public T Max { get; } public T Min { get; } Comparer obtains the comparer for the invoking set The Max property obtains the largest value in the set, and Min obtains the smallest value To see an example of SortedSet<T> in action, simply substitute SortedSet for HashSet in the program in the preceding section
The Concurrent Collections
The NET Framework version 40 adds a new namespace called SystemCollectionsConcurrent It contains collections that are thread-safe and designed to be used for parallel programming This means they are safe to use in a multithreaded program in which two or more concurrently executing threads might access a collection simultaneously The concurrent collections are shown here
Concurrent Collection BlockingCollection<T> ConcurrentBag<T> Description Provides a wrapper for a blocking implementation of the IProducerConsumerCollection<T> interface An unordered implementation of the IProducerConsumerCollection<T> interface that works best when a single thread produces and consumes the information Stores key/value pairs Thus, it implements a concurrent dictionary Implements a concurrent queue Implements IProducerConsumerCollection<T> Implements a concurrent stack Implements IProducerConsumerCollection<T>
PART II
ConcurrentDictionary<TKey, TValue> ConcurrentQueue<T> ConcurrentStack<T>
Notice that several of the collections implement the IProducerConsumerCollection interface This interface is also defined in SystemCollectionsConcurrent It extends IEnumerable, IEnumerable<T>, and ICollection It also specifies the TryAdd( ) and TryTake( ) methods that support the producer/consumer pattern (The classic producer/ consumer pattern is characterized by two tasks One task creates items and the other consumes them) TryAdd( ) attempts to add an item to the collection, and TryTake( ) attempts to remove an item from the collection These methods are shown here: bool TryAdd(T item) bool TryTake(out T item) TryAdd( ) returns true if item was added to the collection, and TryTake( ) returns true if an object was removed from the collection If TryTake( ) is successful, then item will contain the object (IProducerConsumerCollection also specifies an overload to CopyTo( ) defined by ICollection and ToArray( ) that copies a collection to an array) The concurrent collections are often used in conjunction with the Task Parallel Library or PLINQ Because of the specialized nature of these collections, not every class is examined in detail However, a brief overview with examples of BlockingCollection<T> will be given Once you know the basics related to BlockingCollection<T>, the other classes will be easy to understand
Part II:
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