WPF前台数据印证（红框）Validation.ErrorTemplate 附加属性

WPF前台数据验证（红框）Validation.ErrorTemplate 附加属性

WPF 显示验证错误的默认方式是在控件周围绘制红色边框。通常需要对此方法进行自定义，以通过其他方式来显示错误。而且，默认情况下不会显示与验证错误关联的错误消息。常见的要求是仅当存在验证错误时才在工具提示中显示错误消息。通过将 Styles 和一组与验证关联的附加属性进行组合，可以相当轻松地自定义验证错误显示。

前台xaml：

<ResourceDictionary	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero">    <!-- 应该在此定义资源字典条目。-->    <LinearGradientBrush x:Key="TextBoxBorder" EndPoint="0,20" StartPoint="0,0" MappingMode="Absolute">        <GradientStop Color="#ABADB3" Offset="0.05"/>        <GradientStop Color="#E2E3EA" Offset="0.07"/>        <GradientStop Color="#E3E9EF" Offset="1"/>    </LinearGradientBrush>    <ControlTemplate x:Key="validationTemplate">    </ControlTemplate>    <Style BasedOn="{x:Null}" TargetType="{x:Type TextBox}">        <Setter Property="Validation.ErrorTemplate" Value="{StaticResource validationTemplate}" />        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>        <Setter Property="BorderBrush" Value="{StaticResource TextBoxBorder}"/>        <Setter Property="BorderThickness" Value="1"/>        <Setter Property="Padding" Value="1"/>        <Setter Property="AllowDrop" Value="true"/>        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>        <Setter Property="Template">            <Setter.Value>                <ControlTemplate TargetType="{x:Type TextBox}">                    <Grid x:Name="root">                        <Grid.ColumnDefinitions>                            <ColumnDefinition Width="*"/>                            <ColumnDefinition Width="1"/>                        </Grid.ColumnDefinitions>                        <Border x:Name="Border" Background="White" BorderBrush="Gray" BorderThickness="0" Padding="2" CornerRadius="1">                            <Microsoft_Windows_Themes:ListBoxChrome x:Name="Bd" SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" RenderFocused="{TemplateBinding IsKeyboardFocusWithin}" RenderMouseOver="{TemplateBinding IsMouseOver}">                                <ScrollViewer x:Name="PART_ContentHost" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>                            </Microsoft_Windows_Themes:ListBoxChrome>                        </Border>                        <Border x:Name="border"  BorderBrush="#FFDB000C" BorderThickness="1" CornerRadius="1" Visibility="Collapsed"  HorizontalAlignment="Stretch" Margin="0" Width="Auto">                            <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>                        <Popup x:Name="popup" Placement="Right" IsOpen="False">                            <Border x:Name="border1_Copy" Width="Auto" Height="Auto" Background="Red" BorderThickness="0" >                                <TextBlock TextWrapping="NoWrap" Text="{Binding (Validation.Errors)[0].ErrorContent, RelativeSource={RelativeSource TemplatedParent}}" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White"/>                            </Border>                            <!--<Grid Width="50" Height="20" Background="Red"/>-->                        </Popup>                        <!--<Popup x:Name="popup"  Placement="Right" PlacementTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}"  Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Top" IsOpen="False" StaysOpen="True" AllowsTransparency="True">                            <Border x:Name="border1_Copy" BorderThickness="1" Margin="0" Background="Red" CornerRadius="2"  HorizontalAlignment="Stretch" Opacity="0" RenderTransformOrigin="0.5,0.5" Height="Auto" Width="Auto">                                <Border.RenderTransform>                                    <TransformGroup>                                        <ScaleTransform/>                                        <SkewTransform/>                                        <RotateTransform/>                                        <TranslateTransform X="10"/>                                    </TransformGroup>                                </Border.RenderTransform>                                <Border.Effect>                                    <DropShadowEffect Direction="-90" BlurRadius="5" Color="#FF808080" ShadowDepth="1"/>                                </Border.Effect>                                <TextBlock TextWrapping="NoWrap" Text="{Binding (Validation.Errors)[0].ErrorContent, RelativeSource={RelativeSource TemplatedParent}}" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White"/>                            </Border>                        </Popup>-->                    </Grid>                    <ControlTemplate.Triggers>                        <Trigger Property="Validation.HasError" Value="True">                            <Setter Property="Visibility" TargetName="border" Value="Visible"/>                        </Trigger>                        <MultiTrigger>                            <MultiTrigger.Conditions>                                <Condition Property="Validation.HasError" Value="True"/>                                <Condition Property="IsFocused" Value="True"/>                            </MultiTrigger.Conditions>                            <Setter Property="IsOpen" TargetName="popup" Value="True"/>                        </MultiTrigger>                    </ControlTemplate.Triggers>                </ControlTemplate>            </Setter.Value>        </Setter>    </Style>    <!--<Style TargetType="TextBox">        <Style.Triggers>            <Trigger Property="Validation.HasError"               Value="True">                <Setter Property="ToolTip">                    <Setter.Value>                        <Binding Path="(Validation.Errors).CurrentItem.ErrorContent" RelativeSource="{x:Static RelativeSource.Self}" />                    </Setter.Value>                </Setter>            </Trigger>        </Style.Triggers>    </Style>--></ResourceDictionary>

后台代码：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;namespace WpfApplication11111{    /// <summary>    /// UserControl2.xaml 的交互逻辑    /// </summary>    public partial class UserControl2 : UserControl    {        private UserInfo _UserInfo;        public UserControl2()        {            InitializeComponent();            this.Loaded += new RoutedEventHandler(UserControl2_Loaded);        }        void UserControl2_Loaded(object sender, RoutedEventArgs e)        {            _UserInfo = new UserInfo();            this.DataContext = _UserInfo;        }        private void btnSave_Click(object sender, RoutedEventArgs e)        {            //txtName.Visibility = Visibility.Collapsed;            UserControl1 _UserControl1 = new UserControl1();            grid.Children.Add(_UserControl1);            string _name = _UserInfo.Name;            string _pass = _UserInfo.Pass;        }    }}

实体类：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel;using System.ComponentModel.DataAnnotations;namespace WpfApplication11111{    public class UserInfo : ValidationUtility, INotifyPropertyChanged    {        #region 数据更新通知        public event PropertyChangedEventHandler PropertyChanged;        private void NotifyPropertyChange(string propertyName)        {            if (PropertyChanged != null)            {                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));            }        }        #endregion        private string _Name;        [Required(ErrorMessage = "[登录名]内容不能为空！")]        [StringLength(255, ErrorMessage = "[登录名]内容最大允许255个字符！")]        [RegularExpression("^[A-Za-z0-9]+$", ErrorMessage = "[登录名]格式不正确！")]        /// <summary>        ///         /// </summary>        public string Name        {            get { return _Name; }            set            {                //Validator.ValidateProperty(value, new ValidationContext(this, null, null) { MemberName = "Name" });                //if (string.IsNullOrEmpty(value))                //{                //    throw new Exception("用户名不能为空.");                //}                _Name = value;                NotifyPropertyChange("Name");            }        }        private string _Pass;        [Required(ErrorMessage = "[密码]内容不能为空！")]        [StringLength(255, ErrorMessage = "[密码]内容最大允许255个字符！")]        [RegularExpression("^[A-Za-z0-9]+$", ErrorMessage = "[密码]格式不正确！")]        /// <summary>        ///         /// </summary>        public string Pass        {            get { return _Pass; }            set            {                //if (string.IsNullOrEmpty(value))                //{                //    throw new Exception("密码不能为空.");                //}                _Pass = value;                NotifyPropertyChange("Pass");            }        }    }}

ValidationUtility.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel;using System.Reflection;using System.ComponentModel.DataAnnotations;namespace WpfApplication11111{    public class ValidationUtility : IDataErrorInfo    {        public string Error        {            get { return _error; }        }        public string _error;        public string this[string columnName]        {            get            {                Type tp = this.GetType();                PropertyInfo pi = tp.GetProperty(columnName);                var value = pi.GetValue(this, null);                object[] Attributes = pi.GetCustomAttributes(false);                if (Attributes != null && Attributes.Length > 0)                {                    foreach (object attribute in Attributes)                    {                        if (attribute is ValidationAttribute)                        {                            ValidationAttribute vAttribute = attribute as ValidationAttribute;                            if (!vAttribute.IsValid(value))                            {                                _error = vAttribute.ErrorMessage;                                return _error;                            }                        }                    }                }                return null;            }        }    }}

代码下载地址：

http://download.csdn.net/detail/hwt0101/5070730

相关地址：

http://msdn.microsoft.com/zh-cn/magazine/ff714593.aspx