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Going about it this way allows the function to ignore the details of the model behind the object. As long as it s an instance of a proper Django model, the attribute will be available and all the fields will be accessible in this way. Since Django automatically adds an to any model that doesn t declare a primary key, the created will also be included in the list. While being able to iterate through a list is great for those situations where all the fields will be taken into account, sometimes only a single field is needed, and the name of that field is known in advance. Since is a list instead of a dictionary, the only way to get a field by its name would be to loop over the fields, checking each to see if its name matches. To cater to this need, Django provides a utility method, . By providing the field name to the , it s easy to retrieve just the specified field. If no field with that name exists, it will raise a exception, which lives at . To get a better understanding of how these methods work together to identify the fields that were declared on a model, consider the following model declaration.

One reason you might use IXmlSerializable is to build web services that send large amounts of data. For example, imagine you want to send a large block of binary data that contains the content from a file. You could use a web service like this: [WebMethod()] public byte[] DownloadFile(string fileName) { ... } The problem is that this approach assumes you ll read the entire data of the file into memory at once, as a byte array. If the file is several gigabytes in size, this will cripple the computer. A better solution is to use IXmlSerializable to implement chunking. That way, you can send an arbitrarily large amount of data over the wire by writing it one chunk at a time. In the following sections, you ll see an example the uses IXmlSerializable to dramatically reduce the overhead of sending a large file.

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The first step is to create the signature for your web method. For this strategy to work, the web method needs to return a class that implements IXmlSerializable. This example uses a class named FileData. Additionally, you need to turn off ASP.NET buffering to allow the response to be streamed across the network. [WebMethod(BufferResponse = false)] [SoapDocumentMethod(ParameterStyle = SoapParameterStyle.Bare)] public FileData DownloadFile(string serverFileName) { ... } The most laborious part is implementing the custom serialization in the FileData class. The basic idea is that when you create a FileData object on the server, you ll simply specify the corresponding filename. When the FileData object is serialized and IXmlSerializable.WriteXml() is called, the FileData object will create a FileStream and start sending binary data one block at a time. Here s the bare skeleton of the FileData class: [XmlRoot(Namespace="http://www.apress.com/ProASP.NET/FileData")] [XmlSchemaProvider("GetSchemaDocument")] public class FileData : IXmlSerializable { // Namespace for serialization. const string ns = "http://www.apress.com/ProASP.NET/FileData"; // The server-side path. private string serverFilePath; // When the FileData is created, make sure the file exists. // This won't defend against other problems reading the file (like // insufficient rights, the file is currently locked by another process, // and so on). public FileData(string serverFilePath) { if (!File.Exists(serverFilePath)) { throw new FileNotFoundException("Source file not found."); } this.serverFilePath = serverFilePath; }

void IXmlSerializable.WriteXml(System.Xml.XmlWriter writer) { ... } System.Xml.Schema.XmlSchema IXmlSerializable.GetSchema() { return null; } void IXmlSerializable.ReadXml(System.Xml.XmlReader reader) { throw new NotImplementedException(); } public static XmlQualifiedName GetSchemaDocument(XmlSchemaSet xs) { // Get the path to the schema file. string schemaPath = HttpContext.Current.Server.MapPath("FileData.xsd"); // Retrieve the schema from the file. XmlSerializer schemaSerializer = new XmlSerializer(typeof(XmlSchema)); XmlSchema s = (XmlSchema)schemaSerializer.Deserialize( new XmlTextReader(schemaPath), null); xs.XmlResolver = new XmlUrlResolver(); xs.Add(s); return new XmlQualifiedName("FileData", ns); } } You ll notice that this class supports writing the file data to XML but not reading it. That's because you're looking at the server's version of the code. It sends FileData objects, but doesn't receive them. In this example, you want to create an XML representation that splits data into separate Base64-encoded chunks. It will look like this: <FileData xmlns="http://www.apress.com/ProASP.NET/FileData"> <fileName>sampleFile.xls</fileName> <size>66048</size> <content> <chunk>...</chunk> <chunk>...</chunk> ... </content> </FileData> Here s the WriteXml() implementation that does the job: void IXmlSerializable.WriteXml(System.Xml.XmlWriter writer) { // Open the file (taking care to allow it to be opened by other threads // at the same time). FileStream fs = new FileStream(serverFilePath, FileMode.Open, FileAccess.Read, FileShare.Read); // Write filename. writer.WriteElementString("fileName", ns, Path.GetFileName(serverFilePath)); // Write file size (useful for determining progress.) long length = fs.Length; writer.WriteElementString("size", ns, length.ToString());

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