UWP Deep Learning Three: dependency properties, attached properties, and data binding

Dependency Properties Overview

Custom Dependency Properties

Attached Properties Overview

Custom attached Properties

Quickstart:data Binding to controls

Data Binding Overview (XAML)

Creating bindings using Code

You can also use the discipline code instead of XAML to connect UI elements to data. To do this, first create a new Binding object, set the appropriate property, and then call frameworkelement.setbinding or Bindingoperations.setbinding. Creating bindings programmatically is useful if you want to choose to bind property values at run time or to share individual bindings in multiple controls. Note, however, that binding property values cannot be changed after you call setbinding .

The following example shows how to implement a previous binding using code.

//Create An instance of the MyColors class//That implements INotifyPropertyChanged.MyColors TextColor =Newmycolors ();//Brush1 is set to being a SolidColorBrush with the value Red.TextColor. BRUSH1 =NewSolidColorBrush (colors.red);//Set The DataContext of the TextBox MyTextBox.Mytextbox.datacontext =TextColor;//Create The binding and associate it with the text box.Binding binding =NewBinding () {Path =NewPropertyPath ("Brush1") }; Mytextbox.setbinding (textbox.foregroundproperty, binding);

To load data incrementally

You can use an incremental load to bind a list control to any large data source and still get high performance. For example, you can bind a list control to Bing image query results without having to load all the results at once. You just load some of the results immediately, and then load other results as needed. To support incremental loading, you must implement isupportincrementalloadingon a data source that supports collection change notifications. When the data binding engine requests more data, your data source must make the appropriate request, integrate the results, and then send the appropriate notification to update the UI. For more information, see XAML Data Binding Sample.

How to bind to hierarchical data and create a master/details view (XAML)

Quickstart:reading and writing files

quickstart:accessing files with file pickers

How to continue your Windows Phone app after calling a file picker

UWP Deep Learning Three: dependency properties, attached properties, and data binding