.NET/Java PDF, Tiff, Barcode SDK Library

The first line is an XML declaration. This is to let the consumers (human users and software applications) of this document know that this is an XML file, the official version to which this file conforms, and the encoding format used. This is optional in XML, but this code always produces one. The root element here is the Customer element, with each property represented as a child element. The xmlns:xsi and xmlns:xsd attributes relate to the XML Schema specification. They are optional, and don t do anything useful in this example, so we will not explain them further. If you are interested, please read the XML specification or other documentation, such as the MSDN Library, for more details. Aside from those optional parts, this XML representation of the Customer object is equivalent to the one created in Example 12-1. However, instead of writing numerous lines of code to deal with the XML specifics, you need only three lines using .NET XML serialization classes. Furthermore, it is just as easy to reconstruct an object from its XML form:

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Customer c2 = serializer.Deserialize(new StringReader(xml)) as Customer; Console.WriteLine("Customer in Object:\n{0}", c2.ToString());

All it needs is to call the XmlSerializer.Deserialize method. It has several overloaded versions, one of which takes a TextReader instance as an input parameter. Because StringReader is derived from TextReader, you just pass an instance of StringReader to read from the XML string. The Deserialize method returns an object, so it is necessary to cast it to the correct type. Of course, there s a price to pay. XML serialization is less flexible than working with the XML APIs directly with serialization you decide exactly what XML elements and attributes you expect to see when you write the code. If you need to be able to adapt dynamically to elements whose names you only learn at runtime, you will need to stick with the XML-aware APIs.

When embedding resources into the executables, you create a resource file that you refer to from the project file. A resource can be an icon, a translation, or any other file that your application uses. (Refer to 4 for more on the resource file format.)

dictionary analogy the hash code effectively tells it on which page the entry belongs. Hash collisions mean dictionary entries share a page, and the dictionary has to spend time scanning through the entries to find the right one. The fewer hash collisions you have, the faster dictionaries work. If you use built-in numeric types such as int as keys, or if you use string, you can safely ignore all of this because these types provide good hash codes. You need to care about this only if you plan to use a custom type which defines its own notion of equality (i.e., that overrides Equals).

When you start using collection types that require multiple generic type arguments such as this, specifying the full type name in the variable declaration and then again in the constructor starts to look a bit verbose, so if you re using a dictionary with a local variable, you might prefer to use the var keyword introduced in C# 3.0, as shown in Example 9-3.

var myDictionary = new Dictionary<string, string>();

Remember, the var keyword simply asks C# to work out the variable s type by looking at the expression you re using to initialize the variable. So Example 9-3 is exactly equivalent to Example 9-2. Just as arrays and other lists can be initialized with a list of values in braces, you can also provide an initializer list for a dictionary. As Example 9-4 shows, you must provide both a key and a value for each entry, so each entry is contained within nested braces to keep the key/value grouping clear.

The resource files usually have the file name extension qrc. They are added to the RESOURCES variable in the project file, which causes the resource compiler rcc to compile the specified resources into an intermediate C++ source file. You can control where these intermediate files are placed by using the RCC_DIR variable.

To this web service you can add a new WebMethod called getCarValue with the following code: [WebMethod] public int GetCarValue(string strCarMake, string strCarModel, int strCarYear) { int nReturn = 0; if (strCarMake == "Honda") nReturn = 30000; else nReturn = 20000; if (strCarModel == "Pilot") nReturn += 10000; int nDepreciation = (SystemDateTimeNowYear - strCarYear) * 2000; nReturn -= nDepreciation; return MathMax(0,nReturn); } This crude calculation establishes the value of a Honda at $30,000, unless it is a Pilot, in which case it is $40,000 Other makes have a base value of $20,000, unless they are Pilots, in which case they are $30,000 Depreciation is counted as $2,000 per year of age..

var myDictionary = new Dictionary<string, string>() { { "dog", "Not a cat." }, { "sea", "Big blue wobbly thing that mermaids live in." } };

Storing individual items in a dictionary also uses an array-like syntax:

myDictionary["sea"] = "Big blue wobbly thing that mermaids live in.";