ASP.NET PDF Viewer using C#, VB/NET

There are several ways to configure Qt during the build process For instance, you can control what parts of Qt to include and how those parts will behave, which enables you to build your applications to use only the parts of Qt that they need resulting in a smaller executable and smaller memory footprint You saw some of the defines that can be used to do this in the DEFINES variable discussion, but you will look at more in this section The two major variables for controlling which parts of Qt to include are QT and CONFIG QT controls the modules to be included in your project The default is to include core and gui.

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Dictionaries are extremely useful tools, because the situations they deal with anyplace something is associated with something else crop up all the time. They are so widely used that it s helpful to look at some common concrete examples.

Computer systems often use inscrutable identifiers where people would normally use a name For example, imagine a computer system for managing patients in a hospital This system would need to maintain a list of appointments, and it would be useful for the hospital s reception staff to be able to tell arriving patients where to go for their appointment So the system would need to know about things such as buildings and departments radiography, physiotherapy, and so on The system will usually have some sort of unique identifier for entities such as these in order to avoid ambiguity and ensure data integrity But users of the system will most likely want to know that an appointment is in the Dr Marvin Munroe Memorial Building, rather than, say, the building with ID 49 So the user interface will need to convert the ID to text.

The information about which ID corresponds to which building typically belongs in a database, or possibly a configuration file You wouldn t want to bake the list into a big switch statement in the code, as that would make it hard to support multiple customers, and would also need a new software release anytime a building is built or renamed The user interface could just look up the name in the database every time it needs to display an appointment s information, but there are a few problems with this First, the computer running the UI might not have access to the database if the UI is written as a client-side application in WPF or Windows Forms, there s a good chance that it won t a lot of companies put databases behind firewalls that restrict access even on the internal network.

The following modules are available (depending on which edition of Qt you are using): core: The core module gui: The user interface module, QtGui, used in all applications having a graphical user interface network: The QtNetwork module, used in 14 opengl: The QtOpenGL module, used in 7 sql: The QtSql module, used in 13 svg: The QtSvg module, used in 7 xml: The QtXml module, used in 8 qt3support: The Qt3Support module, used to make it easier to port Qt 3 applications to Qt 4 The second major variable, the CONFIG variable, is usually set up in a reasonable fashion by default The most common values to use are the following: thread: If included, the application is built with support for multithreading console: If included, Windows applications will have a console This console is used to show qDebug messages, for example release: Builds the project in release mode.

And even if it did, making a request to the server for each IDbased field takes time in a form with several such fields, you could easily end up causing a noticeable delay And this would be unnecessary for data that s not expected to change from day to day A dictionary can provide a better solution here When the application starts up, it can load a dictionary to go from an ID to a name Translating an ID to a displayable name then becomes as simple as this:.

Next, create a new web form, and call it CalcCarValue.aspx. Drag an Atlas ScriptManager control to the design surface, and add HTML Input (Text) controls and an Input (Button) control to it. Label the three test fields as Make:, Model:, and Year:, and call them txtMake, txtModel, and txtYear, respectively. Give the button the text Get Value. Your screen should look like Figure 3-15.

string buildingName = buildingIdToNameMap[buildingId];

As for how you would load this dictionary in the first place, that ll depend on where the data is stored. Whether it s coming from a file, a database, a web service, or somewhere else, you can use LINQ to initialize a dictionary we ll see how to do that in Dictionaries and LINQ.

By default, all public read/write properties are serialized as child elements. You can customize your classes by specifying the type of XML node you want for each of your public properties, as shown in Example 12-9.

debug: Builds the project in debug mode debug_and_release: Builds the project in both release and debug modes plugin: Builds a plugin dll: Builds a dynamically linkable library, also known as a shared object qttestlib: Adds the Qt support library for building unit tests..

using System; using System.IO; using System.Xml.Serialization; namespace Programming_CSharp { // Simple customer class public class Customer

{