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POWhy DataContract is faster than Serializable?
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copied!<p>I tried to make the serialization and deserialization of a custom object using the code below.</p> <pre><code>[Serializable] public class TaskProperty { public int Id { get; set; } public DateTime ScheduleTime { get; set; } public TimeSpan InitializationTime { get; set; } public Nullable<DateTime> InstantOfStart { get; set; } public TimeSpan TotalElapsedTime { get; set; } } // Main var serializer = new DataContractSerializer(typeof(TaskProperty)); var reader = new FileStream("myfile.xml", FileMode.Open); TaskProperty deserialized = (TaskProperty)(serializer.ReadObject(reader)); reader.Close(); Console.WriteLine("deserialized: {0}", deserialized); </code></pre> <p>If the <code>TaskProperty</code> class is decorated with <code>DataContract</code> attribute (and with <code>DataMember</code> attribute for each property), the deserialization is much faster than when it is decorated with <code>Serializable</code> attribute:</p> <ul> <li>using <code>DataContract</code> and <code>DataMember</code> attributes, the deserialization is almost immediate;</li> <li>using <code>Serializable</code> attribute, the deserialization is very slow (it takes about 30 seconds).</li> </ul> <p>Why?</p> <p><strong>UPDATE...</strong> Furthermore, if the deserialization is preceded by the serialization of an object of the same type (obviously with different contents), the serialization is slow while the deserialization is fast. In a similar way, if serialization is preceded by deserializing an object of the same type, the deserialization is slow while the serialization is fast.</p> <p><strong>UPDATE 2...</strong> For completeness, I added the custom class that should be serialized and deserialized.</p> <p><strong>UPDATE 3...</strong> Well, maybe I discovered the cause of the slowness that affects the <code>Serializable</code> attribute, but I do not understand why. Essentially, if I explicitly declare the five private fields related to the five properties, as a consequence, the first serialization (or deserialization) is almost instant. Why?</p>

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