相信很多人都听说过这句名言：garbage in ,garbage out ! 数据录入不规范(或错误)就象一颗定时炸弹，迟早会给系统带来麻烦，所以在数据录入时做好验证是很有必要的。

相对传统asp.net开发而言，SL4中的数据验证要轻松很多（主要得益于Xaml的Binding特性），步骤如下：

1、定义业务Model类时，在需要验证的属性setter中，写好业务逻辑，对于不合规范的value，要抛出异常！

同时切记Model类要实现INotifyPropertyChanged接口，同时每个setter方法的最后，要显示调用OnPropertyChanged方法

比如，我们要做一个会员注册填写资料的Form，需要一个UserModel类，为了方便，先定义一个通用的基类BusinessBaseObject.cs

using System.ComponentModel;
namespace BusinessObject
{public class BusinessBaseObject : INotifyPropertyChanged{public event PropertyChangedEventHandler PropertyChanged;/// <summary>/// 属性改变时触发事件/// </summary>/// <param name="propertyName">Property that changed.</param>protected void OnPropertyChanged(string propertyName){PropertyChangedEventHandler handler = PropertyChanged;if (null != handler){handler.Invoke(this, new PropertyChangedEventArgs(propertyName));}}}
}

再来定义UserModel.cs

#define DEV
//#undef DEV
using System;
using Common.Silverlight;namespace BusinessObject
{public class UserModel : BusinessBaseObject{private string _userName;public string UserName{get { return _userName; }set{#if DEVif (string.IsNullOrEmpty(value)){throw new Exception("用户名不能为空");}if (!(value.IsEmail() || value.IsUserName())){throw new Exception("格式错误，正确示例如：abc007");}
#endif_userName = value;OnPropertyChanged("UserName");}}private bool? _sex = null;public bool? Sex{get { return _sex; }set {
#if DEVif (!_sex.HasValue) {throw new Exception("请选择性别");}
#endif_sex = value;OnPropertyChanged("UserName");}}       private string _password;public string Password{get { return _password; }set{if (string.IsNullOrEmpty(value)){throw new Exception("密码不能为空!");}
#if DEVif (value.Length < 6){throw new Exception("密码长度不得低于6位");}
#endif_password = value;OnPropertyChanged("Password");}}private string _password2;public string Password2{get { return _password2; }set{if (string.IsNullOrEmpty(value)){throw new Exception("密码不能为空");}
#if DEVif (value!=this._password){throw new Exception("重复密码必须与密码输入一致");}
#endif_password2 = value;OnPropertyChanged("Password2");}}private DateTime _birthday;public DateTime Birthday{get { return _birthday; }set{
#if DEVif (value <= DateTime.Now.AddYears(-100)){throw new Exception("我们不赞同百岁以上的老人上网");}
#endif_birthday = value;OnPropertyChanged("Birthday");}}private string _email;public string Email{get { return _email; }set{
#if DEVif (!string.IsNullOrEmpty(value) && !value.IsEmail()){throw new Exception("格式错误，正确示例如：yjmyzz@126.com");}
#endif_email = value;OnPropertyChanged("Email");}}private string _telephone;public string Telephone{get { return _telephone; }set{
#if DEVif (!value.IsTel()){throw new Exception("格式错误，正确示例如：021-38889088或021-36559079-023");}
#endif_telephone = value;OnPropertyChanged("Telephone");}}private string _mobile = "";public string Mobile{get { return _mobile; }set{#if DEVif (!value.IsMobile()){throw new Exception("格式错误，正确示例如：13916752109");}#endifthis._mobile = value;OnPropertyChanged("Mobile");}}private bool _agree = false;public bool Agree{get { return _agree; }set {
#if DEVif (value==false){throw new Exception("您必须同意注册条款!");}
#endifthis._agree = value;OnPropertyChanged("Agree");}}private int _internetAge = 0;public int InternetAge{get { return _internetAge; }set {
#if DEVif (_internetAge<0){throw new Exception("网龄不能为负数");}#endif_internetAge = value;OnPropertyChanged("InternetAge");}}private TimeRange _internetHours = new TimeRange();public TimeRange InternetHours{get { return _internetHours; }set { _internetHours = value;OnPropertyChanged("InternetHours");}}}public class TimeRange : BusinessBaseObject{private TimeSpan start = DateTime.Now.TimeOfDay + TimeSpan.FromMinutes(5);private TimeSpan end = DateTime.Now.TimeOfDay + TimeSpan.FromHours(1);private const int MaximumRangeSpan = 6;public TimeSpan Start{get{return this.start;}set{if (value < DateTime.Now.TimeOfDay){throw new Exception("上网时段起始值必须在当前时间5分钟以后");//注：这个限定只是为了演示数据验证，并无实际意义}if (End - value > TimeSpan.FromHours(MaximumRangeSpan)){ThrowOutOfRangeException();}this.start = value;OnPropertyChanged("Start");}}public TimeSpan End{get{return this.end;}set{if (value < DateTime.Now.TimeOfDay){throw new Exception("上网时段截止值不能早于当前时间");//注：这个限定只是为了演示数据验证，并无实际意义}if (value - Start > TimeSpan.FromHours(MaximumRangeSpan)){ThrowOutOfRangeException();}this.end = value;OnPropertyChanged("End");}}private static void ThrowOutOfRangeException(){string message = string.Format("上网时间不能大于 {0} 小时", MaximumRangeSpan);throw new Exception(message);}}
}

2、xaml界面部分，用Binding将各控件与Model实例的属性关联，对于指定长度和指定输入字符集的字段(比如:18位身份证号，手机号之类)，最适合用RadMaskedTextBox，示例如下：

<UserControl xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:validation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input"xmlns:System="clr-namespace:System;assembly=mscorlib" xmlns:Telerik_Windows_Controls_MaskedTextBox="clr-namespace:Telerik.Windows.Controls.MaskedTextBox;assembly=Telerik.Windows.Controls.Input" xmlns:Telerik_Windows_Controls_Chromes="clr-namespace:Telerik.Windows.Controls.Chromes;assembly=Telerik.Windows.Controls"  x:Class="Telerik.Sample.Validataion"mc:Ignorable="d"d:DesignHeight="600" d:DesignWidth="600"><UserControl.Resources>       <Style x:Key="PasswordBoxToRadMaskTextBoxStyle" TargetType="PasswordBox"><Setter Property="BorderThickness" Value="1"/><Setter Property="Background" Value="#FFFFFFFF"/><Setter Property="Foreground" Value="#FF000000"/><Setter Property="Padding" Value="2"/><Setter Property="BorderBrush" Value="#FF848484" />           <Setter Property="Template"><Setter.Value><ControlTemplate TargetType="PasswordBox"><Grid x:Name="RootElement"><VisualStateManager.VisualStateGroups><VisualStateGroup x:Name="CommonStates"><VisualState x:Name="Normal"/><VisualState x:Name="MouseOver"><Storyboard><ColorAnimation Duration="0" To="#FFFFC92B" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="Border"/></Storyboard></VisualState><VisualState x:Name="Disabled"><Storyboard><DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="DisabledVisualElement"/></Storyboard></VisualState></VisualStateGroup><VisualStateGroup x:Name="FocusStates"><VisualState x:Name="Focused"><Storyboard><ColorAnimation Duration="0" To="#FFFFC92B" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="Border"/></Storyboard></VisualState><VisualState x:Name="Unfocused"><Storyboard><ColorAnimation Duration="0" To="{TemplateBinding BorderBrush}" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="Border"/></Storyboard></VisualState></VisualStateGroup><VisualStateGroup x:Name="ValidationStates"><VisualState x:Name="Valid"/><VisualState x:Name="InvalidUnfocused"><Storyboard><ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ValidationErrorElement"><DiscreteObjectKeyFrame KeyTime="0"><DiscreteObjectKeyFrame.Value><Visibility>Visible</Visibility></DiscreteObjectKeyFrame.Value></DiscreteObjectKeyFrame></ObjectAnimationUsingKeyFrames></Storyboard></VisualState><VisualState x:Name="InvalidFocused"><Storyboard><ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ValidationErrorElement"><DiscreteObjectKeyFrame KeyTime="0"><DiscreteObjectKeyFrame.Value><Visibility>Visible</Visibility></DiscreteObjectKeyFrame.Value></DiscreteObjectKeyFrame></ObjectAnimationUsingKeyFrames><ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IsOpen" Storyboard.TargetName="validationTooltip"><DiscreteObjectKeyFrame KeyTime="0"><DiscreteObjectKeyFrame.Value><System:Boolean>True</System:Boolean></DiscreteObjectKeyFrame.Value></DiscreteObjectKeyFrame></ObjectAnimationUsingKeyFrames></Storyboard></VisualState></VisualStateGroup></VisualStateManager.VisualStateGroups><Border x:Name="Border" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="1" Opacity="1" BorderBrush="{TemplateBinding BorderBrush}">                             <Border x:Name="ContentElement" Margin="{TemplateBinding Padding}"/>                                </Border><Border x:Name="DisabledVisualElement" BorderBrush="#A5F7F7F7" BorderThickness="{TemplateBinding BorderThickness}" Background="#A5F7F7F7" IsHitTestVisible="False" Opacity="0"/><Border x:Name="ValidationErrorElement" BorderBrush="#FFDB000C" BorderThickness="1" CornerRadius="1" Visibility="Collapsed"><ToolTipService.ToolTip><ToolTip x:Name="validationTooltip" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}" Placement="Right" PlacementTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}" Template="{StaticResource ValidationToolTipTemplate}"><ToolTip.Triggers><EventTrigger RoutedEvent="Canvas.Loaded"><BeginStoryboard><Storyboard><ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IsHitTestVisible" Storyboard.TargetName="validationTooltip"><DiscreteObjectKeyFrame KeyTime="0"><DiscreteObjectKeyFrame.Value><System:Boolean>true</System:Boolean></DiscreteObjectKeyFrame.Value></DiscreteObjectKeyFrame></ObjectAnimationUsingKeyFrames></Storyboard></BeginStoryboard></EventTrigger></ToolTip.Triggers></ToolTip></ToolTipService.ToolTip><Grid Background="Transparent" HorizontalAlignment="Right" Height="12" Margin="1,-4,-4,0" VerticalAlignment="Top" Width="12"><Path Data="M 1,0 L6,0 A 2,2 90 0 1 8,2 L8,7 z" Fill="#FFDC000C" Margin="1,3,0,0"/><Path Data="M 0,0 L2,0 L 8,6 L8,8" Fill="#ffffff" Margin="1,3,0,0"/></Grid></Border></Grid></ControlTemplate></Setter.Value></Setter></Style></UserControl.Resources><Grid x:Name="LayoutRoot" Background="White"><Grid VerticalAlignment="Center" HorizontalAlignment="Center" Width="500"><Grid.RowDefinitions><RowDefinition Height="30" /><RowDefinition Height="30" /><RowDefinition Height="30" /><RowDefinition Height="30" /><RowDefinition Height="30" /><RowDefinition Height="30" /><RowDefinition Height="30" /><RowDefinition Height="30" /><RowDefinition Height="30" /><RowDefinition Height="50" /><RowDefinition Height="30" /><RowDefinition Height="Auto"/><RowDefinition Height="30" /></Grid.RowDefinitions><Grid.ColumnDefinitions><ColumnDefinition Width="100" /><ColumnDefinition Width="400" MinWidth="200"/></Grid.ColumnDefinitions><TextBlock Grid.Row="0" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="用户名："/></TextBlock><telerik:RadMaskedTextBox Grid.Column="1" Grid.Row="0" x:Name="txtUserName" VerticalAlignment="Center" GotFocus="RadMaskedTextBox_GotFocus"Value="{Binding UserName, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}" EmptyContent="格式:2-50位字母、数字、下线线组合" Width="250" MaskType="None" HorizontalAlignment="Left" /><TextBlock Grid.Row="1" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="密码："/></TextBlock><PasswordBox Grid.Row="1" Grid.Column="1" Width="250" MaxLength="32"  HorizontalAlignment="Left" VerticalAlignment="Center" Password="{Binding Password, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}" x:Name="txtPwd" Style="{StaticResource PasswordBoxToRadMaskTextBoxStyle}" /><TextBlock Grid.Row="2" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="重复密码："/></TextBlock><PasswordBox Grid.Row="2" Grid.Column="1" Width="250" HorizontalAlignment="Left" VerticalAlignment="Center" Password="{Binding Password2, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}" x:Name="txtPwd2" Style="{StaticResource PasswordBoxToRadMaskTextBoxStyle}"/><TextBlock Grid.Row="3" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="性别："/></TextBlock><StackPanel Grid.Row="3" Grid.Column="1" Orientation="Horizontal" ><telerik:RadComboBox x:Name="rcboSex" Width="250" SelectedIndex="2"><telerik:RadComboBoxItem Content="男" /><telerik:RadComboBoxItem Content="女" /><telerik:RadComboBoxItem Content="保密" /></telerik:RadComboBox></StackPanel><TextBlock Grid.Row="4" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="电话号码："/></TextBlock><telerik:RadMaskedTextBox Grid.Column="1" Grid.Row="4"  MaskType="None" ValueChanging="txtTel_ValueChanging"  x:Name="txtTel" VerticalAlignment="Center" GotFocus="RadMaskedTextBox_GotFocus"Value="{Binding Telephone, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}" EmptyContent="格式:区号-电话号码-分机号(可选)" Width="250" HorizontalAlignment="Left"  /><TextBlock Grid.Row="5" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="手机号码："/></TextBlock><telerik:RadMaskedTextBox Grid.Column="1" Grid.Row="5" Mask="###########" x:Name="txtMobile" VerticalAlignment="Center" GotFocus="RadMaskedTextBox_GotFocus"Value="{Binding Mobile, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}" EmptyContent="比如：13916752109" Width="250" HorizontalAlignment="Left" /><TextBlock Grid.Row="6" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="电子邮箱："/></TextBlock><telerik:RadMaskedTextBox Grid.Column="1" Grid.Row="6" MaskType="None" x:Name="txtEmail" VerticalAlignment="Center" GotFocus="RadMaskedTextBox_GotFocus"Value="{Binding Email, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}" EmptyContent="比如：youname@sample.com" Width="250" HorizontalAlignment="Left" /><TextBlock Grid.Row="7" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="出生日期："/></TextBlock><telerik:RadDatePicker Grid.Column="1" Grid.Row="7"SelectedDate="{Binding Birthday, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}"Width="250" Height="22" HorizontalAlignment="Left"  x:Name="rdp_Birthday" /><TextBlock Grid.Row="8" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="网龄："/></TextBlock><telerik:RadNumericUpDown Grid.Row="8" Grid.Column="1"  Minimum="0" Maximum="30"Value="{Binding InternetAge, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}"Loaded="btnInternetAge_Loaded" SmallChange="1" HorizontalAlignment="Left"  VerticalAlignment="Center"Width="250" x:Name="btnInternetAge" /><TextBlock Grid.Row="9" Grid.Column="0" TextAlignment="Right" VerticalAlignment="Center"><Run Text="经常上网时段："/></TextBlock><StackPanel Grid.Row="9" Grid.Column="1"><telerik:RadSlider IsSelectionRangeEnabled="True"Style="{StaticResource RadSliderStyle}" Minimum="0" Maximum="1380"TickFrequency="240"SelectionStart="{Binding InternetHours.Start, Converter={StaticResource TimeConverter}, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}"SelectionEnd="{Binding InternetHours.End, Converter={StaticResource TimeConverter}, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}"TickPlacement="TopLeft"  Width="250"  HorizontalAlignment="Left"><telerik:RadSlider.TickTemplate><DataTemplate><Grid><TextBlock FontSize="8" UseLayoutRounding="True"Text="{Binding Converter={StaticResource TickValueConverter}}" /></Grid></DataTemplate></telerik:RadSlider.TickTemplate></telerik:RadSlider><StackPanel Orientation="Horizontal"  Width="200"UseLayoutRounding="True" HorizontalAlignment="Left" Margin="25,0,0,0"><TextBlock FontSize="8"Text="{Binding InternetHours.Start, Converter={StaticResource TimeToTextConverter}}" /><TextBlock FontSize="8" Text=" - " /><TextBlock FontSize="8"Text="{Binding InternetHours.End, Converter={StaticResource TimeToTextConverter}}" /></StackPanel></StackPanel><telerik:RadToggleButton Grid.Row="10" Width="250" HorizontalAlignment="Left" Grid.Column="1" Content="我同意注册条款" VerticalAlignment="Center" IsChecked="{Binding Agree, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}" x:Name="btnAgree" /><validation:ValidationSummary Grid.Row="11" Grid.Column="0" Grid.ColumnSpan="2" AllowDrop="True" Header="提示" x:Name="ValidationSummary1"/><telerik:RadButton Content="提交" Grid.Row="12" Grid.Column="1" Height="22" Width="65" HorizontalAlignment="Left" Click="btnSubmit_Click" x:Name="btnSubmit" Margin="190,0,0,0"/></Grid></Grid>
</UserControl>

3、Xaml.cs后端部分

using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System;
using BusinessObject;
using Telerik.Windows.Controls;
using System.Text.RegularExpressions;namespace Telerik.Sample
{public partial class Validataion : UserControl{UserModel model = new UserModel();public Validataion(){InitializeComponent();this.Loaded += new RoutedEventHandler(Validataion_Loaded);}void Validataion_Loaded(object sender, RoutedEventArgs e){          this.DataContext = model;#region//model.Mobile = "13916752109";//model.UserName = "yjmyzz";//model.Password = "123456";//model.InternetAge = 10;//model.Birthday = new DateTime(1979, 6, 5);//model.Telephone = "021-36559079";//model.Email = "yjmyzz@126.com";//model.Password2 = model.Password;#endregion#region 有错误时，不允许提交(必须配合输入框获取焦点时，自动激活验证)Binding binding = new Binding("HasErrors");binding.Source = ValidationSummary1;binding.Converter = new HasErrorsToIsEnabledConverter();this.btnSubmit.SetBinding(Button.IsEnabledProperty, binding);#endregion}private void RadMaskedTextBox_GotFocus(object sender, RoutedEventArgs e){      //文本框获得焦点时，自动激活实时验证UpdateBindingExpression(sender as DependencyObject, RadMaskedTextBox.ValueProperty);}private void UpdateBindingExpression(DependencyObject obj, DependencyProperty prop){BindingExpression b = obj.ReadLocalValue(prop) as BindingExpression;b.UpdateSource();}private void btnSubmit_Click(object sender, RoutedEventArgs e){           //显式验证必填项UpdateBindingExpression(txtUserName, RadMaskedTextBox.ValueProperty);UpdateBindingExpression(txtPwd, PasswordBox.PasswordProperty);UpdateBindingExpression(txtPwd2, PasswordBox.PasswordProperty);UpdateBindingExpression(this.btnAgree, RadToggleButton.IsCheckedProperty);}private void btnInternetAge_Loaded(object sender, RoutedEventArgs e){//去掉小数位(sender as RadNumericUpDown).NumberFormatInfo.NumberDecimalDigits = 0;}private void txtTel_ValueChanging(object sender, RadMaskedTextBoxValueChangingEventArgs e){    //只能输入"0-9"和下划线e.Handled = new Regex(@"^[\d-]{0,}$").IsMatch(e.NewMaskedText) == false;}}
}