Input And Data Binding in WPF Development

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iFour Consultancy
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Input And Data Binding

• Windows Presentation Foundation (WPF) provides a
  powerful API with the help of which applications
  can get input from various devices such as mouse,
  keyboard, and touch panels.
• Data binding is the process that establishes a
  connection between the application UI and
  business logic. If the binding has the correct
  settings and the data provides the proper
  notifications, then, when the data changes its
  value, the elements that are bound to the data
  reflect changes automatically

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What We Will Cover

• Binding data to UI Elements
• Using Converters to convert data during Binding
• Using Data Templates to visualize data

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Data Binding Concepts

• Binding Components
• Target Object
• Target Property
• Binding Source
• Path
• Target Property Must be a dependency property

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Binding Modes

• OneWay-Updates the target property only when the
  source property change.
• TwoWay-Updates the target property or the
  property whenever either the target property or
  the source property changes.
• OneWayToSource-updates the source property when
  the target property changes
• OneTime- Updates the target property only when
  the application starts or when the DataContext
  undergoes a change.

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What Triggers Updates

• Triggering supported by TwoWay or OneWayToSource
  mode of binding
• Dependency property or INotifyPropertyChanged
• UpdateSourceTrigger property
• Explicit -Updates the binding source only when
  you call.
• UpdateSource- method. 
• LostFocus-Updates the binding source whenever the
  binding target element loses

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Data Binding Methods

• Binding using XAML
• Binding using Code

ltLabel Name"lblNote" Content"DynamicResource
ResourceKeyNote" /gt ltTextBox Name"txtNote"
VerticalContentAlignment"Top"
HorizontalAlignment"Stretch" Text"Binding
AppointmentNote,ModeTwoWay" VerticalAlignment"S
tretch" Width"Auto" Height"Auto" /gt
MyData myDataObject new MyData(DateTime.Now)
Binding myBinding new
Binding("MyDataProperty") myBinding.Source
myDataObject myText.SetBinding(TextBlock.TextPr
operty, myBinding)
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Converting DataOverview

• Used when data doesnt match between bindings
  create a conversion class
• When to use
• Culture changes needed
• Different View of data then native storage
• Incompatible data types between target and source

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Converting Data Out-of-Box Converters

• Contained in the System.Windows.Controls
  namespace
• BooleanToVisibilityConverter
• Converts True/False to Visible, Hidden or
  Collapsed
• BorderGapMaskConverter
• Represents a converter that converts the
  dimensions of a GroupBox control into a
  VisualBrush

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Data Templates Overview

• Makes it easy to put content with data
• Easy to define visual styles for data
• Reusable and modifiable

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