实例 -验证文本框单价为大于零的正数，失去焦点时执行。
Xaml：
<Grid x:Name="LayoutRoot"Background="{x:Null}" Width="400"Height="200">
<Grid.RowDeFinitions>
<RowDeFinition/>
<RowDeFinition/>
<RowDeFinition/>
</Grid.RowDeFinitions>
<Grid.ColumnDeFinitions>
<ColumnDeFinitionWidth="0.3*"/>
<ColumnDeFinitionWidth="0.7*"/>
</Grid.ColumnDeFinitions>
<sdk:Label Height="20" HorizontalAlignment="Left"Name="ProductLable" Content="ProductName:"
Width="90" />
<sdk:Label Grid.Row="1" Height="20"HorizontalAlignment="Left" Name="PriceLable"Content="Price:"
Width="90"/>
<TextBox Grid.Column="1" Height="23"HorizontalAlignment="Left"
Name="textBox1"Text="{Binding ProductName,Mode=
OneWay}"
Width="180" />
<TextBox Grid.Column="1" Grid.Row="1" Height="23"HorizontalAlignment="Left"
Name="textBox2"Text="{Binding Price,Mode=
TwoWay,NotifyOnValidationError=True,ValidatesOnExceptions=True}"BindingValidatiWidth="180" /> <Button Content="Change" Grid.Row="2"Grid.Column="1" Height="23" Name="button1"Width="75" Click="button1_Click" /> </Grid> cs： public partial class DataBindingAndValidate :UserControl { Book book = new Book(); public DataBindingAndValidate() { InitializeComponent(); book.ProductName = "test product name"; book.Price = 12.0; this.textBox1.DataContext = book; this.textBox2.DataContext = book; } private void button1_Click(object sender,RoutedEventArgs e) { book.Price = book.Price + 10.0; } private void textBox2_BindingValidationError(object sender,ValidationErrorEventArgs e) { if (e.Action == ValidationErrorEventActi on.Added) { this.textBox2.BorderBrush = new SolidColorBrush(Colors.Red); } else if (e.Action == ValidationErrorEventActi on.Removed) { this.textBox2.BorderBrush = newSolidColorBrush(Colors.LightGray); } } } public class Book : INotifyPropertyChanged { public event PropertyChangedEventHand ler PropertyChanged; private void NotifyPropertyChange(string propertyName) { if (PropertyChanged != null) { PropertyChanged(this,newPropertyChangedEventArgs (propertyName)); } } private string productName; public string ProductName { get { return productName; } set { productName = value; } } private double price; public double Price { get { return price; } set { if (value <= 0) { throw new Exception("请输入大于零的正数！"); } price = value; NotifyPropertyChange("Price"); } } }
Xaml：
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