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vb.net ocr read text from pdf

vb.net ocr read text from pdf

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The second parameter in the EventHandler delegate type is an object of class EventArgs, which is declared in the System namespace. You might be tempted to think that, since the second parameter is meant for passing data, an EventArgs class object would be able to store data of some sort. You would be wrong. The EventArgs class is designed to carry no data. It is used for event handlers that do not need to pass data and is generally ignored by them. If you want to pass data, you must declare a class derived from EventArgs, with the appropriate fields to hold the data you want to pass. Even though the EventArgs class does not actually pass data, it is an important part of the pattern of using the EventHandler delegate. Class object and class EventArgs are the base classes of whatever actual types are used as the parameters. This allows EventHandler to provide a signature that is the lowest common denominator for all events and event handlers, allowing them to have exactly two parameters, rather than having different signatures for each case.

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In Listings 29-1 and 29-2, I created the child XElements by passing two string parameters to the constructor: the name of the element and the value. In fact, you can pass any object as the second parameter, and a string representation of the object will be included in the XML data. Listing 29-3 demonstrates this using an enum and a custom class. Listing 29-3. Using String Representations of Objects in XElements using System; using System.Xml.Linq; enum FruitSize { Small, Medium, Large } class Fruit { public Fruit(string nameParam, int stockParam) { Name = nameParam; ItemsInStock = stockParam; } public string Name { get; set; } public int ItemsInStock { get; set; } public override string ToString() { return Name; } } class Listing 03 {

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There are several conventions for naming properties and their backing fields. One convention is to use the same string for both names, but use camel casing (in which the first letter is lowercase) for the field and Pascal casing for the property. Although this violates the general rule that it is bad practice to have different identifiers that differ only in casing, it has the advantage of tying the two identifiers together in a meaningful way. Another convention is to use Pascal casing for the property, and for the field, use the camel case version of the same identifier, with an underscore in front. The following code shows both conventions: private int firstField; public int FirstField { get { return firstField; } set { firstField = value; } } private int _secondField; public int SecondField { get { return _secondField; } set { _secondField = value; } } // Camel casing // Pascal casing

The .NET Framework includes a couple of built-in principal and identity objects that support Windows integrated security or generic security. You can also create your own principal and identity objects by creating classes that implement the IPrincipal and IIdentity interfaces from the System. Security.Principal namespace. Implementations of principal and identity objects will be specific to your environment and security requirements. However, CSLA .NET includes a BusinessPrincipalBase class to streamline the process. When you create a custom principal object, it must inherit from BusinessPrincipalBase. Code in the data portal ensures that only a WindowsPrincipal or BusinessPrincipalBase object is passed between client and server, depending on the application s configuration. In many cases, your custom principal object will require very little code. The base class already implements the IPrincipal interface, and it is quite likely that you ll only need to implement the IsInRole() method to fit your needs. However, you will need to implement a custom identity object that implements IIdentity. Typically, this object will populate itself with user profile information and a list of user roles from a database. Essentially, this is just a read-only business object, and so you ll typically inherit from ReadOnlyBase. Such an object might be declared like this: [Serializable] public class CustomIdentity : ReadOnlyBase<CustomIdentity>, IIdentity { // implement here } You ll also need to implement a Login method that the UI code can call to initiate the process of authenticating the user s credentials (username and password) and loading data into the custom identity object. This is often best implemented as a static factory method on the custom principal class. In many cases, this factory method will look something like this:

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