Configuring Data Binding part2 ABTO Software Lecture Korotchyn

Windows Application Development with Microsoft .NET Framework 4
Configuring Data Binding
1. Binding to Data Sources (brief overview of the previous lecture)
2. Manipulating and Displaying Data
by Oleksiy Korotchyn

Binding an Item Control to a List
<ListBox
ItemsSource="{Binding Source={StaticResource myCollection}}"
DisplayMemberPath="FirstName"
/>
myCollection can be:
2
 Simple array
 Collection
 ADO.NET Object
 ObjectDataProvider
 XmlDataProvider

Binding a Single Property to a List
 To show Items Collection (ToString())
<Label Content="{Binding }"/>
 To show Current item:
<Label Content="{Binding /}"/>
3

Binding to Hierarchical Data
 For ADO.NET object:
<Label Content="{Binding
Path=ProductTypes/TypesCategoriesRelation/CategoryName.Length}" />
<!– Table /Relation /Row .Property -->
 For array of objects:
<Label Content="{Binding /PropertyObject.PropertyObject.MyProperty}"/>
<Label Content="{Binding Path=PropertyObject.PropertyObject.MyProperty}"/>
4

Navigating a Collection or List
To get a reference to ICollectionView:
System.ComponentModel.ICollectionView myView;
myView = CollectionViewSource.GetDefaultView(myCollection);
5

Binding to an Object with ObjectDataProvider
1) IsAsynchronous – indicates whether object creation and method calls are performed on the foreground thread
or on a background thread.
2) ObjectInstance – gets or sets the object used as the binding source.
 Let’s see example
6

Windows Application Development with Microsoft .NET Framework 4
Configuring Data Binding
1. Binding to Data Sources
2. Manipulating and Displaying Data
by Oleksiy Korotchyn

Data Templates
<DataTemplate>
<StackPanel>
<TextBlock>Company Name:</TextBlock>
<TextBlock Text="{Binding CompanyName}" />
<Label Content="{Binding Path=ContactName}"/>
</StackPanel>
</DataTemplate>
8

Data Templates
Setting the Data Template
<Label>
<Label.ContentTemplate>
<DataTemplate>

</DataTemplate>
</Label.ContentTemplate>
</Label>
9

Setting the Data Template
 Note that for item controls, the DisplayMemberPath and ItemTemplate properties are mutually exclusive.
(you can set one but not the other)
10

Using Converters to Apply Conditional Formatting in Data Templates
[ValueConversion(typeof(DateTime), typeof(Brush))]
public class DateBrushConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo
culture)
{ … }
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
11

Using DataTemplateSelector
 The DataTemplateSelector class enables you to assign data templates dynamically to collection objects based on
the content of the data.
12

public class DateDataTemplateSelector : DataTemplateSelector
{
public override DataTemplate SelectTemplate(object item, DependencyObject
container)
{
FrameworkElement element = container as FrameworkElement;
if (element != null && item != null && item is System.Data.DataRowView)
{return element.FindResource("BasicTemplate") as DataTemplate; }
return null; }}
13

<Window x:Class="MainWindow"
…
<Window.Resources>
<my:DateDataTemplateSelector x:Key="myTemplateSelector" />
</Window.Resources>
<ListBox ItemTemplateSelector="{StaticResource myTemplateSelector}" />
</Window>
14

15

Using Hierarchical Data Templates
Item-Related Properties of HierarchicalDataTemplate:
1) ItemBindingGroup – gets or sets the BindingGroup property that is copied to each child item.
2) ItemContainerStyle – gets or sets the Style property that is applied to the item container for each child item.
3) ItemContainerStyleSelector – gets or sets custom style-selection logic for a style that can be applied to each item
container.
4) ItemsSource – gets or sets the binding for this data template, which indicates where to find the collection that
represents the next level in the data hierarchy
16

Item-Related Properties of HierarchicalDataTemplate:
5) ItemStringFormat – gets or sets a composite string that specifies how to format the items in the next level in the
data hierarchy if they are displayed as strings.
6) ItemTemplate – gets or sets the data template to apply to the ItemTemplate property on a generated
HeaderedItemsControl control (such as MenuItem or TreeViewItem) to indicate how to display items from the
next level in the data hierarchy.
7) ItemTemplateSelector – gets or sets DataTemplateSelector to apply to the ItemTemplateSelector property on a
generated HeaderedItemsControl control (such as MenuItem or TreeViewItem) to indicate how to select a
template to display items from the next level in the data hierarchy
17

18

Sorting Data
 Bound data can be sorted through the default ICollectionView element for the data list
19

Sorting Data
myView.SortDescriptions.Add(new
System.ComponentModel.SortDescription("LastName",
System.ComponentModel.ListSortDirection.Ascending));
20

Sorting Data
System.ComponentModel.SortDescription("LastName",
System.ComponentModel.SortDescription("FirstName",
21

Applying Custom Sorting
public class MyComparer : System.Collections.IComparer
{
public int Compare(object x, object y)
{
Employee empX = (Employee)x;
Employee empY = (Employee)y;
return empX.LastName.Length.CompareTo(empY.LastName.Length);
}
}
22

Applying Custom Sorting
myView =(ListCollectionView)CollectionViewSource.GetDefaultView(myCollection);
myView.CustomSort = new MyComparer();
23

Grouping
myView.GroupDescriptions.Add(new PropertyGroupDescription("EmployeeTitle"));
24

Grouping
Properties of GroupStyle:
 ContainerStyle – gets or sets the style applied to the GroupItem object generated for each item
 ContainerStyleSelector – represents an instance of StyleSelector that determines the appropriate style to use for
the container
 HeaderTemplate – gets or sets the template used to display the group header
 HeaderTemplateSelector – represents an instance of StyleSelector that determines the appropriate style to use
for the header
 Panel – gets or sets a template that creates the panel used to layout the items
25

Creating Custom Grouping
 To create a custom group, you must create a class that implements the IValueConverter interface, which exposes
two methods: Convert and ConvertBack.
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Creating Custom Grouping
myView.GroupDescriptions.Add(new PropertyGroupDescription("Region", new
RegionGrouper()));
27

Filtering Data
myView = CollectionViewSource.GetDefaultView(myItems);
myView.Filter = new Predicate<object>(myFilter);
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Filtering Data
public bool myFilter(object param)
{
return (param.ToString().Length > 8);
}
29

Filtering ADO.NET Objects
The filter expression is a string expression in the following format:
<ColumnName> <Operator> <Value>
BindingListCollectionView myView;
myView = (BindingListCollectionView)CollectionViewSource.GetDefaultView(myItems);
myView.CustomFilter = "Sandwich = 'Muffaletta'";
30

Filtering, Grouping and Sorting
31

Configuring Data Binding part2 ABTO Software Lecture Korotchyn

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