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because the ReadXml() method uses that information to determine where to create the file. The ClientFolder property must be a static property, because the client doesn t get the chance to create and configure the FileDataClient object it wants to use. Instead, .NET creates a FileDataClient instance automatically and uses it to deserialize the data. By using a static property, the client can set this piece of information before starting the download, as shown here: FileDataClient.ClientFolder = @"c:\MyFiles"; The deserialization code performs the reverse task of the serialization code it steps through the chunks and writes them to the new file. Here s the complete code: void IXmlSerializable.ReadXml(System.Xml.XmlReader reader) { if (FileDataClient.ClientFolder == "") { throw new InvalidOperationException("No target folder specified."); } reader.ReadStartElement(); // Get the original filename. string fileName = reader.ReadElementString("fileName", ns); // Get the size (not currently used). double size = Convert.ToDouble(reader.ReadElementString("size", ns)); // Create the file. FileStream fs = new FileStream(Path.Combine(ClientFolder, fileName), FileMode.Create, FileAccess.Write); // Read the XML and write the file one block at a time. byte[] fileBytes; reader.ReadStartElement("content", ns); double totalRead = 0; while (true) { if (reader.IsStartElement("chunk", ns)) { string bytesBase64 = reader.ReadElementString(); totalRead += bytesBase64.Length; fileBytes = Convert.FromBase64String(bytesBase64); fs.Write(fileBytes, 0, fileBytes.Length); fs.Flush(); // You could report progress by raising an event here. Console.WriteLine("Received chunk."); } else { break; } } fs.Close(); reader.ReadEndElement(); reader.ReadEndElement(); }

When the shell encounters $(( expression )), it evaluates expression and places the result on the command line; expression is an arithmetic expression. Besides the four basic arithmetic operations of addition, subtraction, multiplication, and division, its most used operator is % (modulo, the remainder after division). $ sa "$(( 1 + 12 ))" "$(( 12 * 13 ))" "$(( 16 / 4 ))" "$(( 6 - 9 ))" :13: :156: :4: :-3:

Here s a complete console application that uses the FileService: static void Main() { Console.WriteLine("Downloading to c:\\"); FileDataClient.ClientFolder = @"c:\"; Console.WriteLine("Enter the name of the file to download."); Console.WriteLine("This is a file in the server's download directory."); Console.WriteLine("The download directory is c:\\temp by default."); Console.Write("> "); string file = Console.ReadLine(); FileService proxy = new FileService(); Console.WriteLine(); Console.WriteLine("Starting download."); proxy.DownloadFile(file); Console.WriteLine("Download complete."); } Figure 33-8 shows the result.

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Figure 33-8. Downloading a large file with chunking You can find this example online, with a few minor changes (for example, the client and server methods for working with the file are combined into one FileData class).

To simplify this task, Django provides another attribute, , which contains the field object that will be used as the primary key for the model This is also faster than iterating over all the fields, since is populated once, when the model is first processed After all, Django needs to determine whether it needs to provide an implicit primary key The attribute is also used to enable the shortcut property on model instances, which returns the primary key value for an instance, regardless of which field is the primary key Typically, models don t need to declare an explicit primary key, and can instead let Django create one automatically This can be a useful way to avoid repeating such a common declaration, while still allowing it to be overridden if necessary.

One of the key principles of service-oriented design is that the client and the server share contracts, not classes. That level of abstraction allows clients on widely different platforms to interact with the same web service. They send the same serialized XML, but they have the freedom to use different programmatic structures (such as classes) to prepare their messages. In some cases, you might want to bend these rules to allow your clients to work with rich data types. For example, you might want to take a custom data class, distribute it to both the client and server, and allow them to send or receive instances of this class with a web service. .NET 2.0 makes this possible with a new feature called schema importer extensions.

Think twice about using custom data types. The danger of this approach is that it can easily lead you to develop a proprietary web service. Although your web service will still use XML (which can always be read on any platform), once you start tailoring your XML to fit platform-specific types, it might be prohibitively difficult for other clients to parse that XML or do anything practical with it. For example, most non-.NET clients don t have an easy way to consume the XML generated for the DataSet.

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