Silverlight 4 中数据绑定发生的变化

DependencyObject Binding
在Silverlight之前的版本中，其支持的元素绑定只是允许绑定继承自FrameworkElement类下元素，但是比如一些形变比如Transformations就不能绑定了。现在数据绑定也可以绑定继承自DependencyObject下的任何元素。
代码

public List<Person> GetPeople()
{
List<Person> peeps = new List<Person>();
peeps.Add(new Person() { FirstName = "Wang", LastName = "Zhe", Gender = "M", AgeGroup = "Adult" });
peeps.Add(new Person() { FirstName = "nasa", LastName = "wang", Gender = "M", AgeGroup = "Adult" });
peeps.Add(new Person() { FirstName = "summer", LastName = "liang", Gender = "F", AgeGroup = "Kid" });
peeps.Add(new Person() { FirstName = "liang", LastName = "jing", Gender = "F", AgeGroup = "Kid" });
return peeps;
}

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Error Propogation
Silverlight的数据验证机制，在这里得到了很多的扩充，提供了IDataErrorInfo、INotifyDataErrorInfo从而能得到更多的信息。