C# 4 and .NET 4

Data Binding ❘ 1057
< Label Style="{StaticResource labelStyle}"
Content="{Binding XPath=Publisher}"
Grid.Row="1" Grid.Column="1" / >
< Label Style="{StaticResource labelStyle}"
Content="{Binding XPath=@isbn}"
Grid.Row="2" Grid.Column="1" / >
< /Grid >
< /Window >
code snippet BooksDemo/MainWindow.xaml
Figure 36 - 10 shows the result of the XML binding.
figure 36-10
If XML data should be shown hierarchically, you can use the TreeView control.
binding Validation
Several options are available to validate data from the user before it is used with the .NET objects. These
options are:
➤
➤
➤
Handling exceptions
Data error information
Handling exceptions
Custom validation rules
One of the options demonstrated here is that the .NET class throws an exception if an invalid value is set as
shown in the class SomeData . The property Value1 accepts only values larger or equal to 5 and smaller than 12:
public class SomeData
{
private int value1;
public int Value1 {
get
{
return value1;
}
set
{
if (value < 5 || value > 12)
throw new ArgumentException(
"value must not be less than 5 or greater than 12");
value1 = value;
}
}
}
code snippet ValidationDemo/SomeData.cs
www.it-ebooks.info