print barcode labels in vb.net DATA BINDING AND SILVERLIGHT LIST CONTROLS in C#

Making PDF417 in C# DATA BINDING AND SILVERLIGHT LIST CONTROLS

CHAPTER 5 DATA BINDING AND SILVERLIGHT LIST CONTROLS
PDF 417 Drawer In C#
Using Barcode encoder for .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
Scanning PDF417 In Visual C#.NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
public class Book { public string Title { get; set; } public string ISBN { get; set; } } } 4. Now that you have Book defined, you need to create an instance of Book and set it to the LayoutRoot s DataContext, as follows: void Page_Loaded(object sender, RoutedEventArgs e) { Book b = new Book() { Title = "Beginning Silverlight 4: From Novice to Professional", ISBN = "978-1430229889" }; this.LayoutRoot.DataContext = b; } When you set up binding definitions for different controls, the controls do not know where they are going to get their data. The DataContext property sets the data context for a control that is participating in data binding. The DataContext property can be set directly on the control. If a given control does not have a DataContext property specified, it will look to its parent for its data context. The nice thing about this model is that if you look above in the XAML for the page, you will see little indication of where the controls are getting their data. This provides an extreme level of code separation, allowing designers to design XAML UIs and developers to work alongside the designers, defining the specifics of how the controls are bound to their data sources. 5. At this point, you can go ahead and start debugging the application. If all goes well, you will see the four text boxes populated with the data from the Book s instance (see Figure 5-2). With the application running, change the book title in the first text box to just Beginning Silverlight, by removing the From Novice to Professional. You might expect that, since the third text box is bound to the same data, it will automatically update to reflect this change. However, a couple of things need to be done to get this type of two-way binding to work. One problem is that, currently, the Book class does not support notifying bound clients of changes to its properties. In other words, when a property changes in Book, the class will not notify the TextBox instances that are bound to the class of the change. You could take care of this by creating a change event for each property. This is far from ideal; fortunately, there is an interface that a class can implement that handles this for you. This interface is known as INotifyPropertyChanged. Let s use it.
Code 39 Generator In Visual C#
Using Barcode printer for Visual Studio .NET Control to generate, create Code 39 Extended image in .NET framework applications.
www.OnBarcode.com
Painting Barcode In Visual C#.NET
Using Barcode encoder for VS .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
CHAPTER 5 DATA BINDING AND SILVERLIGHT LIST CONTROLS
Generate EAN128 In Visual C#.NET
Using Barcode creator for VS .NET Control to generate, create UCC-128 image in Visual Studio .NET applications.
www.OnBarcode.com
PDF-417 2d Barcode Drawer In Visual C#.NET
Using Barcode printer for .NET Control to generate, create PDF417 image in VS .NET applications.
www.OnBarcode.com
Modify the Book class definition to inherit from INotifyPropertyChanged. Notice that when you inherit from INotifyPropertyChanged, you need to add using System.ComponentModel. Luckily, Visual Studio will help you with this, as shown in Figure 5-3.
Printing EAN-13 In Visual C#.NET
Using Barcode encoder for .NET framework Control to generate, create EAN 13 image in .NET applications.
www.OnBarcode.com
ANSI/AIM Codabar Creator In Visual C#
Using Barcode creator for VS .NET Control to generate, create ABC Codabar image in .NET applications.
www.OnBarcode.com
Figure 5-3. Visual Studio assists when you need to add the System.ComponentModel namespace. Next, you can let Visual Studio do some more work for you. After adding the using System.ComponentModel statement, right-click INotifyPropertyChanged and select Implement Interface Implement Interface from the pop-up menu, as shown in Figure 5-4.
PDF417 Encoder In None
Using Barcode drawer for Software Control to generate, create PDF417 image in Software applications.
www.OnBarcode.com
Painting PDF 417 In None
Using Barcode generation for Office Word Control to generate, create PDF417 image in Office Word applications.
www.OnBarcode.com
CHAPTER 5 DATA BINDING AND SILVERLIGHT LIST CONTROLS
Code 128B Drawer In Objective-C
Using Barcode encoder for iPhone Control to generate, create ANSI/AIM Code 128 image in iPhone applications.
www.OnBarcode.com
EAN / UCC - 13 Printer In Java
Using Barcode printer for Java Control to generate, create UCC - 12 image in Java applications.
www.OnBarcode.com
Figure 5-4. Visual Studio also assists in implementing the INotifiyPropertyChanged interface. Now Visual Studio has added a new public event to your class: public class Book : INotifyPropertyChanged { public string Title { get; set; } public string ISBN { get; set; } public event PropertyChangedEventHandler PropertyChanged; } 8. Next, you need to create a convenience method that will fire the PropertyChanged event. Call it FirePropertyChanged, as shown in the following code: public class Book : INotifyPropertyChanged { public string Title { get; set; } public string ISBN { get; set; } public event PropertyChangedEventHandler PropertyChanged; void FirePropertyChanged(string property) { if (PropertyChanged != null) {
Drawing PDF-417 2d Barcode In None
Using Barcode printer for Word Control to generate, create PDF 417 image in Office Word applications.
www.OnBarcode.com
Barcode Drawer In None
Using Barcode encoder for Word Control to generate, create Barcode image in Office Word applications.
www.OnBarcode.com
CHAPTER 5 DATA BINDING AND SILVERLIGHT LIST CONTROLS
Create Quick Response Code In Java
Using Barcode generation for Java Control to generate, create QR Code image in Java applications.
www.OnBarcode.com
Code 128B Creator In .NET
Using Barcode printer for Reporting Service Control to generate, create ANSI/AIM Code 128 image in Reporting Service applications.
www.OnBarcode.com
PropertyChanged(this, new PropertyChangedEventArgs(property)); } } 9. Now you need to extend the simplified properties by adding private members and full get/set definitions to define the get and set operations, as shown in the following code. The get is just like a normal get operation, where you simply return the internal member value. For the set, you first set the internal member value, and then call the FirePropertyChanged method, passing it the name of the property. public class Book : INotifyPropertyChanged { private string _title; private string _isbn; public string Title { get { return _title; } set { _title = value; FirePropertyChanged("Title"); } } public string ISBN { get { return _isbn; } set { _isbn = value; FirePropertyChanged("ISBN"); } } public event PropertyChangedEventHandler PropertyChanged; }
Decode Barcode In Java
Using Barcode Control SDK for BIRT reports Control to generate, create, read, scan barcode image in BIRT reports applications.
www.OnBarcode.com
Read ANSI/AIM Code 128 In VB.NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Print PDF 417 In VB.NET
Using Barcode printer for .NET Control to generate, create PDF-417 2d barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Encode PDF417 In None
Using Barcode encoder for Online Control to generate, create PDF-417 2d barcode image in Online applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.