WPF Data Binding Tomer Shamam Smart Client Team Leader Sela Group

Agenda WPF in a Nutshell Today’s Data-View Data Binding Concept Handling Data Changes Value Conversion Collection Data Binding Data Validation Trace and Debug Data Visualization New in.NET 3.5 SP1 Limitations

WPF in a Nutshell

Today’s Data-View Set Move Load

Data Binding in Action One Way Two Way One Time One WayTo Source

Data Binding in Action

Handling Data Changes Socket socket = …; View view = …; Binding binding = …;... socket.IsActive = true; Socket socket = …; View view = …; Binding binding = …;... socket.IsActive = true; IsActive = Socket false Changed true

Property Change Mechanisms INotifyPropertyChanged interface Changed event pattern PropertyDescriptor value changed WPF DependencyProperty

Handling Data Changes

+ Temperature Site INotifyPropertyChanged Two-way Value Conversion Temperature Brush Converter Temperature Brush Converter Fahrenheit Celsius Converter Fahrenheit Celsius Converter

Data Binding Converters

Collection Data Binding Collection SingleSocket <ListView ItemsSource=“{Binding}” /> ItemsSource=“{Binding}” /><ListView Sort () Filter() Group() Sort () Filter() Group() CollectionView OnOffSwitch RangeSwitch SingleSocket

Collection Binding

Data Validation User input validation in WPF is done through Binding Three options to validate input: ExceptionValidationRule IDataErrorInfo Custom Validation Rule <Binding Source="{StaticResource data}" Path="Age" UpdateSourceTrigger="PropertyChanged">

Validating User input

Trace and Debug Binding throws exceptions on critical errors Path spelling mistakes are traced Binding errors are traceable TraceListener listener = new XxxWriterTraceListener(...); PresentationTraceSources.DataBindingSource.Listeners.Add( listener);... C# App.config

Data Binding Tracing

Data Visualization Collection SingleSocket OnOffSwitch RangeSwitch SingleSocket

Data Visualization

Limitations Data Binding is Untyped Target is limited to DependencyObject No multithreaded support for Collection Binding Data Template parts are Hard to Get! Interface-specific Data Template is not supported Blend data-binding support is limited

New in.NET 3.5 SP1 StringFormat support within {{ Binding }} expressions New alternating rows support in ItemsControl Better handling for null in editable controls Item-level validation MultiSelector support IEditableCollectionView support Performance improvements with IEnumerable

Summary New Design Approach Data-View Decoupling Better Development Experience Eliminates Boilerplate Code Try it now…

Resources Data Binding on MSDN us/library/ms aspx us/library/ms aspx Windows Client.NET Beatriz Costa Blog My Blog shamam/ shamam/

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