C# 4 and .NET 4

1010 ❘ ChaPTer 35 cOre wpf
multiTrigger
A property trigger fires when a value of a property changes. If you need to set a trigger because two or more
properties have a specific value, you can use MultiTrigger.
MultiTrigger has a Conditions property where valid values of properties can be specified. It also has
a Setters property, where the properties that need to be set can be specified. In the example, a style is
defined for TextBox elements where the trigger applies if the IsEnabled property is True and the Text
property has the value Test. If both apply, the Foreground property of the TextBox is set to Red:
data Triggers
code snippet TriggerDemo/MultiTriggerWindow.xaml
Data triggers fire if bound data to a control fulfills specific conditions. In the following example, a Book
class is used that has different displays depending on the publisher of the book.
The Book class defines the properties Title and Publisher and has an overload of the ToString()
method:
public class Book
{
public string Title { get; set; }
public string Publisher { get; set; }
}
public override string ToString()
{
return Title;
}
code snippet TriggerDemo/Book.cs
In the XAML code, a style is defined for ListBoxItem elements. The style contains DataTrigger elements
that are bound to the Publisher property of the class that is used with the items. If the value of the
Publisher property is Wrox Press, the Background is set to Red. With the publishers Dummies and
Sybex, the Background is set to Yellow and LightBlue accordingly:
www.it-ebooks.info