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Isolated Storage Summary
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Isolated storage is a simple mechanism that allows programmers to store data on a per-user basis. Where possible, users should use isolated storage in preference to using the Windows registry or attempting to manage a directory hierarchy manually. While not suitable for storing secure or confidential data, the isolated storage mechanism is incredibly useful and allows assemblies that have low security requirements to store data persistently.
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Object Serialization
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Object serialization is the process of rendering an object into a state that can be stored persistently. The Java platform has included serialization support since version 1.1, and while
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10. Streams, Files, and I/O
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there have been additional enhancements, the model has proved sufficiently flexible to meet the needs of most developers. In .NET, the way in which serialized data is stored is controlled by formatters, which are classes that implement the System.Runtime.Serialization.IFormatter interface. Two implementations are available in the .NET Framework:
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System.Runtime.Serialization.Formatters.Binary.BinaryFormatter System.Runtime.Serialization.Formatters.Soap.SoapFormatter
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The BinaryFormatter produces a compact and efficient binary representation of the state of an object. The SoapFormatter produces an XML SOAP document that can be parsed like any other XML document. Both formatters accept an instance of System.IO.Stream to read from or write to and so can be used to serialize to a range of backing stores, including files and network connections.
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Simple Serialization
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Java classes are not serializable by default and are required to implement the java.io.Serializable interface before they can be persisted. .NET classes require annotation with the Serializable attribute before they can be processed by the formatter. The following class demonstrates the use of this attribute:
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[Serializable] class SimpleClass { private int o_int; private string o_string; public int SimpleInt { get { return o_int; } set { o_int = value; } } public String SimpleString { get { return o_string; } set { o_string = value; } }
This class maintains two private members, which are accessible via public properties. Because the class is annotated, it can be serialized and restored as shown next. We use these statements to serialize all of the example classes in this section:
10. Streams, Files, and I/O using using using using System; System.IO ; System.Runtime.Serialization ; System.Runtime.Serialization.Formatters.Binary ;
class Test { public static void Main() { SimpleClass x_simple = new SimpleClass(); x_simple.SimpleInt = 20172; x_simple.SimpleString = "C# for Java Developers"; FileStream x_stream = new FileStream("serial.bin", FileMode.OpenOrCreate, FileAccess.Write); IFormatter x_formatter = new BinaryFormatter(); x_formatter.Serialize(x_stream, x_simple); x_stream.Close(); FileStream x_in_stream = new FileStream("serial.bin", FileMode.Open, FileAccess.Read); x_simple = (SimpleClass)x_formatter.Deserialize(x_in_stream); x_in_stream.Close(); Console.WriteLine("String value: " + x_simple.SimpleString); Console.WriteLine("Int value: " + x_simple.SimpleInt);
We start by creating an instance of the serializable class, named SimpleClass, and set the values for the private variables. We then create a FileStream that will be used to store the serialized data, followed by a BinaryFormatter. The formatter is created with this statement:
IFormatter x_formatter = new BinaryFormatter();
Alternatively, if we wanted a SoapFormatter, the syntax would be
IFormatter x_formatter = new SoapFormatter();
Finally we call the IFormatter.Serialize method, passing in the stream and the object to persist. Restoring the object is just as easy. We create a new FileStream that will read from the file that we created and then call the IFormatter.Deserialize method passing in the stream. In common with the Java serialization support, the Deserialize method returns an object, which must be cast to SimpleClass before we can print the values of the int and string members. This example demonstrates the basic serialization of an object. The following sections illustrate how the programmer can exert more control over the serialization process and select which elements should be persisted.
10. Streams, Files, and I/O
Selective Serialization
In the preceding section, both the int and string fields were serialized. .NET provides support for selecting fields to be omitted from the persistent data. Fields marked with the NonSerialized attribute will not be persisted. The following code fragment demonstrates the use of this attribute to indicate that the int field should not be serialized for the SimpleClass type:
[Serializable] class SimpleClass { [NonSerialized] private int o_int; private string o_string;
Using the formatter as shown results in the following output:
String value: C# for Java Developers Int value: 0
When the instance is restored from the file, there is no persisted value for o_int, so the default value (0) is displayed.
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