C# 4 and .NET 4

Data Binding ❘ 1043
publisher = value;
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(
“Publisher”));
}
}
private string isbn;
public string Isbn {
get
{
return isbn;
}
set
{
isbn = value;
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs("Isbn"));
}
}
private readonly List authors = new List();
public string[] Authors
{
get
{
return authors.ToArray();
}
}
}
}
public override string ToString()
{
return this.title;
}
code snippet BooksDemo/Data/Book.cs
With this change, the application can be started again to verify that the user interface gets an update from
the change in the event handler.
object data Provider
Instead of instantiating the object in code-behind, you can do this with XAML. To reference a class from
code-behind within XAML, you have to reference the namespace with the namespace declarations in the
XML root element. The XML attribute xmlns:local=“clr-namespace:Wrox.ProCsharp.WPF” assigns
the .NET namespace Wrox.ProCSharp.WPF to the XML namespace alias local.
One object of the Book class is now defined with the Book element inside the DockPanel resources. By
assigning values to the XML attributes Title, Publisher, and Isbn, you set the values of the properties
from the Book class. x:Key=“theBook” defines the identifier for the resource so that you can reference the
book object: