SystemObsoleteAttribute in C#.NET

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SystemObsoleteAttribute
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As mentioned earlier, predefined attributes affect the compiler s and/or the runtime s behavior ObsoleteAttribute provides another example of attributes affecting the compiler s behavior The purpose of ObsoleteAttribute is to help with the versioning of code, providing a means of indicating to callers that a particular member is no longer current Listing 1723 is an example of ObsoleteAttribute usage As Output 178 shows, any callers that compile code that invokes a member marked with ObsoleteAttribute will cause a compile-time warning, optionally an error
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Listing 1723: Using ObsoleteAttribute
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class Program { public static void Main() { ObsoleteMethod(); } [Obsolete] public static void ObsoleteMethod() { } }
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OUTPUT 178:
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c:\SampleCode\ObsoleteAttributeTestcs(24,17): warning CS0612: ProgramObsoleteMethod() is obsolete
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In this case, ObsoleteAttribute simply displays a warning However, there are two additional constructors on the attribute One of them, ObsoleteAttribute(string message), appends the additional message argument to the compiler s obsolete message The second, however, is a bool error parameter that forces the warning to be recorded as an error instead
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Attributes ObsoleteAttribute allows third parties to notify developers of depre-
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cated APIs The warning (not an error) allows the original API to work until the developer is able to update the calling code
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Serialization-Related Attributes
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Using predefined attributes, the framework supports the capacity to serialize objects onto a stream so they can be deserialized back into objects at a later time This provides a means of easily saving a document type object to disk before shutting down an application Later, the document may be deserialized so the user can continue to work on it In spite of the fact that an object can be relatively complex and can include links to many other types of objects that also need to be serialized, the serialization framework is easy to use In order for an object to be serializable, the only requirement is that it includes a SystemSerializableAttribute Given the attribute, a formatter class reflects over the serializable object and copies it into a stream (see Listing 1724)
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Listing 1724: Saving a Document Using SystemSerializableAttribute
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using System; using SystemIO; using SystemRuntimeSerializationFormattersBinary; class Program { public static void Main() { Stream stream; Document documentBefore = new Document(); documentBeforeTitle = "A cacophony of ramblings from my potpourri of notes"; Document documentAfter; using (stream = FileOpen( documentBeforeTitle + "bin", FileModeCreate)) { BinaryFormatter formatter = new BinaryFormatter(); formatterSerialize(stream, documentBefore); } using (stream = FileOpen( documentBeforeTitle + "bin", FileModeOpen))
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17: Reflection and Attributes
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{ BinaryFormatter formatter = new BinaryFormatter(); documentAfter = (Document)formatterDeserialize( stream); } ConsoleWriteLine(documentAfterTitle); } }
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// Serializable classes use SerializableAttribute [Serializable] class Document { public string Title = null; public string Data = null; [NonSerialized] public long _WindowHandle = 0; class Image { } [NonSerialized] private Image Picture = new Image(); }
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Output 179 shows the results of Listing 1724
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OUTPUT 179:
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A cacophony of ramblings from my potpourri of notes
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Listing 1724 serializes and deserializes a Document object Serialization involves instantiating a formatter (this example uses SystemRuntimeSerializationFormattersBinaryBinaryFormatter) and calling Serialization() with the appropriate stream object Deserializing the object simply involves a call to the formatter s Deserialize() method, specifying the stream that contains the serialized object as an argument However, since the return from Deserialize() is of type object, you also need to cast it specifically to the type that was serialized
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Attributes
Notice that serialization occurs for the entire object graph (all the items associated with the serialized object [Document] via a field) Therefore, all fields in the object graph also must be serializable
SystemNonSerializable Fields that are not serializable should be deco-
rated with the SystemNonSerializable attribute This tells the serialization framework to ignore them The same attribute should appear on fields that should not be persisted for use case reasons Passwords and Windows handles are good examples of fields that should not be serialized: Windows handles because they change each time a window is re-created, and passwords because data serialized into a stream is not encrypted and can easily be accessed Consider the Notepad view of the serialized document in Figure 172