barcode printing vb.net Part IV in C#

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Part IV
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Core Facilities
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serialize . The stream object identifies where the serialized bytes should be placed and can be an object of any type derived from the System.IO.Stream abstract base class . This means that you can serialize an object graph to a MemoryStream, a FileStream, a NetworkStream, and so on . The second parameter to Serialize is a reference to an object . This object could be anything: an Int32, a String, a DateTime, an Exception, a List<String>, a Dictionary<Int32, DatTime>, and so on . The object referred to by the objectGraph parameter may refer to other objects . For example, objectGraph may refer to a collection that refers to a set of objects . These objects may also refer to other objects . When the formatter s Serialize method is called, all objects in the graph are serialized to the stream . Formatters know how to serialize the complete object graph by referring to the metadata that describes each object s type . The Serialize method uses reflection to see what instance fields are in each object s type as it is serialized . If any of these fields refer to other objects, then the formatter s Serialize method knows to serialize these objects, too . Formatters have very intelligent algorithms . They know to serialize each object in the graph no more than once out to the stream . That is, if two objects in the graph refer to each other, then the formatter detects this, serializes each object just once, and avoids entering into an infinite loop . In my SerializeToMemory method, when the formatter s Serialize method returns, the MemoryStream is simply returned to the caller . The application uses the contents of this flat byte array any way it desires . For example, it could save it in a file, copy it to the clipboard, send it over a wire, or whatever . The DeserializeFromStream method deserializes a stream back into an object graph . This method is even simpler than serializing an object graph . In this code, a BinaryFormatter is constructed and then its Deserialize method is called . This method takes the stream as a parameter and returns a reference to the root object within the deserialized object graph . Internally, the formatter s Deserialize method examines the contents of the stream, constructs instances of all the objects that are in the stream, and initializes the fields in all these objects so that they have the same values they had when the object graph was serialized . Typically, you will cast the object reference returned from the Deserialize method into the type that your application is expecting . Note Here s a fun, useful method that uses serialization to make a deep copy, or clone, of an
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object:
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private static Object DeepClone(Object original) { // Construct a temporary memory stream using (MemoryStream stream = new MemoryStream()) {
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24 Runtime Serialization
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// Construct a serialization formatter that does all the hard work BinaryFormatter formatter = new BinaryFormatter(); // This line is explained in this chapter's "Streaming Contexts" section formatter.Context = new StreamingContext(StreamingContextStates.Clone); // Serialize the object graph into the memory stream formatter.Serialize(stream, original); // Seek back to the start of the memory stream before deserializing stream.Position = 0; // Deserialize the graph into a new set of objects and // return the root of the graph (deep copy) to the caller return formatter.Deserialize(stream); } }
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At this point, I d like to add a few notes to our discussion . First, it is up to you to ensure that your code uses the same formatter for both serialization and deserialization . For example, don t write code that serializes an object graph using the SoapFormatter and then deserializes the graph using the BinaryFormatter . If Deserialize can t decipher the contents of the stream, then a System.Runtime.Serialization.SerializationException exception will be thrown . The second thing I d like to point out is that it is possible and also quite useful to serialize multiple object graphs out to a single stream . For example, let s say that we have the following two class definitions:
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[Serializable] internal sealed class Customer { /* ... */ } [Serializable] internal sealed class Order { /* ... */ }
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And then, in the main class of our application, we define the following static fields:
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private static List<Customer> s_customers = new List<Customer>(); private static List<Order> s_pendingOrders = new List<Order>(); private static List<Order> s_processedOrders = new List<Order>();
We can now serialize our application s state to a single stream with a method that looks like this:
private static void SaveApplicationState(Stream stream) { // Construct a serialization formatter that does all the hard work BinaryFormatter formatter = new BinaryFormatter(); // Serialize our application's entire state formatter.Serialize(stream, s_customers); formatter.Serialize(stream, s_pendingOrders); formatter.Serialize(stream, s_processedOrders); }
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