C# 4 and .NET 4

Data Binding ❘ 1049
FirstLast
code snippet MultiBindingDemo/MainWindow.xaml
The multi-value converter implements the interface IMultiValueConverter. This interface defines two
methods, Convert() and ConvertBack(). Convert() receives multiple values with the first argument from
the data source and returns one value to the target. With the implementation, depending on whether the
parameter has a value of FirstLast or LastFirst, the result is created differently:
using System;
using System.Globalization;
using System.Windows.Data;
namespace Wrox.ProCSharp.WPF
{
public class PersonNameConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter,
CultureInfo culture)
{
switch (parameter as string)
{
case "FirstLast":
return values[0] + " " + values[1];
case "LastFirst":
return values[1] + ", " + values[0];
default:
throw new ArgumentException(
String.Format("invalid argument {0}", parameter));
}
}
}
}
public object[] ConvertBack(object value, Type[] targetTypes,
object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
code snippet MultiBindingDemo/MainWindow.xaml.cs
Priority binding
PriorityBinding makes it easy to bind to data that is not readily available. If you need time to get the
result with PriorityBinding, you can inform the user about the progress so he knows to wait.
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