crystal report barcode font free Figure 10-4. Correct display when using the WPF data binding model in VB.NET

Printing QR in VB.NET Figure 10-4. Correct display when using the WPF data binding model

Figure 10-4. Correct display when using the WPF data binding model
Drawing QR-Code In VB.NET
Using Barcode generation for VS .NET Control to generate, create QR image in .NET framework applications.
www.OnBarcode.com
QR-Code Reader In Visual Basic .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
C HAPTE R 10 DA TA BINDIN G
Generating Data Matrix 2d Barcode In VB.NET
Using Barcode maker for .NET Control to generate, create Data Matrix image in .NET applications.
www.OnBarcode.com
Encode 2D Barcode In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create Matrix 2D Barcode image in .NET applications.
www.OnBarcode.com
In this case, the user did exactly the same thing, but when she reduced Credit Limit and tabbed out of that control, the Total Due control immediately showed that it was in error. You can implement this in BusinessBase with a configuration setting in Csla.ApplicationContext.
Create Barcode In Visual Basic .NET
Using Barcode creation for .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Draw GS1 - 12 In Visual Basic .NET
Using Barcode encoder for .NET framework Control to generate, create UPC-A Supplement 5 image in VS .NET applications.
www.OnBarcode.com
Configuration
Printing EAN128 In VB.NET
Using Barcode generator for .NET framework Control to generate, create GTIN - 128 image in .NET framework applications.
www.OnBarcode.com
Create UPC E In VB.NET
Using Barcode encoder for .NET Control to generate, create UPC-E image in .NET applications.
www.OnBarcode.com
There s no universal way for a business object to know that it is data bound to a WPF form or a Windows Forms form, so you need to tell CSLA .NET which type of data binding is being used so the framework can adapt. You can do this by setting a config value in the app.config file in the appSettings section, as shown here: <add key="CslaPropertyChangedMode" value="Xaml" /> or in code, as shown here: Csla.ApplicationContext.PropertyChangedMode = _ Csla.ApplicationContext.PropertyChangedModes.Xaml If set in code, the value should be set exactly once, as the application starts up. The default mode is Windows, which is necessary for backward compatibility with existing CSLA .NET code. This means that all WPF applications should set this property as shown, either in the config file or in code.
QR Code Scanner In VS .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
QR Generator In .NET Framework
Using Barcode encoder for Reporting Service Control to generate, create Denso QR Bar Code image in Reporting Service applications.
www.OnBarcode.com
Raising PropertyChanged in BusinessBase
GS1 DataBar Drawer In Java
Using Barcode creator for Java Control to generate, create GS1 DataBar Expanded image in Java applications.
www.OnBarcode.com
EAN / UCC - 13 Creator In Java
Using Barcode drawer for Java Control to generate, create EAN 13 image in Java applications.
www.OnBarcode.com
In the BusinessBase class, the code that raises the PropertyChanged event when a property is changed works differently depending on the PropertyChangedMode setting. Protected Overridable Sub PropertyHasChanged(ByVal propertyName As String) MarkDirty(True) Dim propertyNames = ValidationRules.CheckRules(propertyName) If ApplicationContext.PropertyChangedMode = _ ApplicationContext.PropertyChangedModes.Windows Then OnPropertyChanged(propertyName) Else For Each name In propertyNames OnPropertyChanged(name) Next End If End Sub If the mode is Windows, then OnPropertyChanged() will be called to raise the event just one time, for the property that was just changed. If ApplicationContext.PropertyChangedMode = _ ApplicationContext.PropertyChangedModes.Windows Then OnPropertyChanged(propertyName) If the mode is Xaml, then the code will loop through a list of all the properties for which validation rules were checked. For Each name In propertyNames OnPropertyChanged(name) Next The CheckRules() method, which I ll discuss in 11, returns a String array containing the names of all the properties for which business or validation rules were invoked. This is effectively the list of all the properties that might need to be refreshed in the WPF interface.
Code 128A Creator In None
Using Barcode drawer for Online Control to generate, create Code 128A image in Online applications.
www.OnBarcode.com
Recognize Barcode In Java
Using Barcode Control SDK for BIRT Control to generate, create, read, scan barcode image in BIRT reports applications.
www.OnBarcode.com
CHAPTER 10 DATA B INDING
Decode UPC Symbol In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
QR-Code Generator In None
Using Barcode creation for Software Control to generate, create QR-Code image in Software applications.
www.OnBarcode.com
The OnPropertyChanged() method is called for each property name, ensuring that the UI updates properly, even if changing one property affects the validation status of other properties.
Create Barcode In .NET
Using Barcode drawer for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
Painting EAN / UCC - 14 In Visual C#.NET
Using Barcode creator for VS .NET Control to generate, create USS-128 image in .NET framework applications.
www.OnBarcode.com
Collection Data Binding
Decode Data Matrix In Visual Basic .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Drawing UPC-A Supplement 5 In None
Using Barcode maker for Font Control to generate, create UPC Symbol image in Font applications.
www.OnBarcode.com
WPF supports two different interfaces for binding to collections: INotifyCollectionChanged and IBindingList. The INotifyCollectionChanged interface and the associated ObservableCollection(Of T) class were introduced with WPF. The INotifyCollectionChanged interface offers a simpler alternative to the relatively complex IBindingList interface. It is important to realize that WPF supports both IBindingList and INotifyCollectionChanged. If a collection implements either interface, it will work fine with WPF data binding. However, for a collection to be useful in Windows Forms as well as WPF, then IBindingList is the only valid option. A collection should never implement both interfaces. The IBindingList interface requires implementation of the ListChanged event, and INotifyCollectionChanged requires implementation of the CollectionChanged event. If a collection implements both, then it will raise both events, and WPF will respond to both events. Each action to a list affects data binding twice, so some very unexpected and undesired results would occur. I ve already discussed how the CSLA .NET collection classes inherit from BindingList(Of T) and thus implement IBindingList. This allows them to work properly with WPF, as well as Windows Forms and Web Forms.
Controls and Helper Objects
WPF data binding is powerful and fun to use. It minimizes the amount of code required in the UI, and it provides a clean layer of abstraction between the UI and your business layer. However, there are some areas where repetitive code can still be required in the UI, and to minimize this, CSLA .NET includes a set of custom WPF controls.
Copyright © OnBarcode.com . All rights reserved.