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Painting PDF417 in C#.NET Part IV

Part IV
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GetObjectData method takes one additional parameter: a reference to the real object that
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is to be serialized . In the GetObjectData method above, this object is cast to DateTime, the value is converted from local time to universal time, and a string (formatted using universal full date/time pattern) is added to the SerializationInfo collection . The SetObjectData method is called in order to deserialize a DateTime object . When this method is called, it is passed a reference to a SerializationInfo object . SetObjectData gets the string date out of this collection, parses it as a universal full date/time formatted string, and then converts the resulting DateTime object from universal time to the machine s local time . The Object that is passed for SetObjectData s first parameter is a bit strange . Just before calling SetObjectData, the formatter allocates (via FormatterServices s static GetUninitializedObject method) an instance of the type that the surrogate is a surrogate for . The instance s fields are all 0/null and no constructor has been called on the object . The code inside SetObjectData can simply initialize the fields of this instance using the values from the passed-in SerializationInfo object and then have SetObjectData return null . Alternatively, SetObjectData could create an entirely different object or even a different type of object and return a reference to this new object, in which case, the formatter will ignore any changes that may or may not have happened to the object it passed in to SetObjectData . In my example, my UniversalToLocalTimeSerializationSurrogate class acts as a surrogate for the DateTime type which is a value type . And so, the obj parameter refers to a boxed instance of a DateTime . There is no way to change the fields in most value types (as they are supposed to be immutable) and so, my SetObjectData method ignores the obj parameter and returns a new DateTime object with the desired value in it . At this point, I m sure you re all wondering how the formatter knows to use this ISerializationSurrogate type when it tries to serialize/deserialize a DateTime object . The following code demonstrates how to test the UniversalToLocalTimeSerializationSurrogate class:
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private static void SerializationSurrogateDemo() { using (var stream = new MemoryStream()) { // 1. Construct the desired formatter IFormatter formatter = new SoapFormatter(); // 2. Construct a SurrogateSelector object SurrogateSelector ss = new SurrogateSelector(); // 3. Tell the surrogate selector to use our surrogate for DateTime objects ss.AddSurrogate(typeof(DateTime), formatter.Context, new UniversalToLocalTimeSerializationSurrogate());
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24 Runtime Serialization
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// NOTE: AddSurrogate can be called multiple times to register multiple surrogates // 4. Tell the formatter to use our surrogate selector formatter.SurrogateSelector = ss; // Create a DateTime that represents the local time on the machine & serialize it DateTime localTimeBeforeSerialize = DateTime.Now; formatter.Serialize(stream, localTimeBeforeSerialize); // The stream displays the Universal time as a string to prove it worked stream.Position = 0; Console.WriteLine(new StreamReader(stream).ReadToEnd()); // Deserialize the Universal time string & convert it to a local DateTime stream.Position = 0; DateTime localTimeAfterDeserialize = (DateTime)formatter.Deserialize(stream); // Prove it worked correctly: Console.WriteLine("LocalTimeBeforeSerialize ={0}", localTimeBeforeSerialize); Console.WriteLine("LocalTimeAfterDeserialize={0}", localTimeAfterDeserialize); } }
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After steps 1 through 4 have executed, the formatter is ready to use the registered surrogate types . When the formatter s Serialize method is called, each object s type is looked up in the set maintained by the SurrogateSelector . If a match is found, then the ISerializationSurrogate object s GetObjectData method is called to get the information that should be written out to the stream . When the formatter s Deserialize method is called, the type of the object about to be deserialized is looked up in the formatter s SurrogateSelector and if a match is found, then the ISerializationSurrogate object s SetObjectData method is called to set the fields within the object being deserialized . Internally, a SurrogateSelector object maintains a private hash table . When AddSurrogate is called, the Type and StreamingContext make up the key and the ISerializationSurrogate object is the key s value . If a key with the same Type/ StreamingContext already exists, then AddSurrogate throws an ArgumentException . By including a StreamingContext in the key, you can register one surrogate type object that knows how to serialize/deserialize a DateTime object to a file and register a different surrogate object that knows how to serialize/deserialize a DateTime object to a different process .
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