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WPF 验证控件

<Window x:Class="WpfApplication2.ValidationTest"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:local="clr-namespace:WpfApplication2"

    Title="ValidationTest" Height="300" Width="800">

    <Window.Resources>

        <Style TargetType="{x:Type TextBox}">

            <Setter Property="Validation.ErrorTemplate">

                <Setter.Value>

                    <ControlTemplate>

                        <DockPanel LastChildFill="True">

                            <TextBlock DockPanel.Dock="Right"

                                 Foreground="Red"

                                 Margin="5"

                                 FontSize="12pt"

                                 Text="{Binding ElementName=MyAdorner, 

                                 Path=AdornedElement.(Validation.Errors)[0].ErrorContent}">

                            </TextBlock>
 
                            <Border BorderBrush="Green" BorderThickness="3">

                                <AdornedElementPlaceholder Name="MyAdorner" />

                            </Border>
 
                        </DockPanel>

                    </ControlTemplate>

                </Setter.Value>

            </Setter>

            <Style.Triggers>

                <Trigger Property="Validation.HasError" Value="true">

                    <Setter Property="ToolTip"

                       Value="{Binding RelativeSource={RelativeSource Self}, 

                       Path=(Validation.Errors)[0].ErrorContent}"/>

                </Trigger>

            </Style.Triggers>

        </Style>
 
    </Window.Resources>
 
    <Grid>

        <TextBox Width="200" Height="50" Margin="5" VerticalAlignment="Top">

            <TextBox.Text>

                <Binding Path="Name" UpdateSourceTrigger="PropertyChanged">

                    <Binding.ValidationRules>

                        <ExceptionValidationRule />

                    </Binding.ValidationRules>

                </Binding>

            </TextBox.Text>
 
        </TextBox>
 
        <TextBox Width="200" Margin="5" Height="50" VerticalAlignment="Center">

            <TextBox.Text>

                <Binding Path="Address" UpdateSourceTrigger="PropertyChanged">

                    <Binding.ValidationRules>

                        <local:StringRangeValidationRule MinimumLength="1" MaximumLength="30"

                         ErrorMessage="Address is required and must be less than 30 letters." />

                    </Binding.ValidationRules>

                </Binding>

            </TextBox.Text>

        </TextBox>
 
        <TextBox Text="HI" Height="50" Width="200" VerticalAlignment="Bottom"/>
 
    </Grid>
</Window>

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.Shapes;
 
namespace WpfApplication2
{

    /// <summary>

    /// Interaction logic for ValidationTest.xaml

    /// </summary>

    public partial class ValidationTest : Window

    {

        public ValidationTest()

        {

            InitializeComponent();
 
            SimpleCustomer c = new SimpleCustomer();

            c.Name = "Fred";

            c.Address = "1/3 Powell Street";

            this.DataContext = c;
 
        }

    }
 
    /// <summary>

    /// 异常验证

    /// </summary>

    public class SimpleCustomer

    {

        public SimpleCustomer()

        { }
 
        private string m_strName;

        public string Name

        {

            set

            {

                this.m_strName = value;

                if (String.IsNullOrEmpty(this.m_strName))

                {

                    throw new ApplicationException("Customer name is mandatory.");

                }

            }

            get

            {

                return this.m_strName;

            }

        }
 
        private string m_strAddress;

        public string Address

        {

            set

            {

                this.m_strAddress = value;

            }

            get

            {

                return this.m_strAddress;

            }

        }

    }
 
    /// <summary>

    /// 自定义验证

    /// </summary>

    public class StringRangeValidationRule : ValidationRule

    {

        public StringRangeValidationRule()

        { }
 
        private int m_intMinimumLength = -1;

        public int MinimumLength

        {

            set

            {

                this.m_intMinimumLength = value;

            }

            get

            {

                return this.m_intMinimumLength;

            }

        }
 
        private int m_intMaximumLength = -1;

        public int MaximumLength

        {

            set

            {

                this.m_intMaximumLength = value;

            }

            get

            {

                return this.m_intMaximumLength;

            }

        }
 
        private string m_strErrorMessage = string.Empty;

        public string ErrorMessage

        {

            set

            {

                this.m_strErrorMessage = value;

            }

            get

            {

                return this.m_strErrorMessage;

            }

        }
 
        public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)

        {

            ValidationResult result = new ValidationResult(true, null);

            string inputString =(value ??  string.Empty).ToString();

            if ( inputString == null)

            {

                inputString = string.Empty;

            }
 
            if(inputString.Length < this.m_intMinimumLength || inputString.Length > this.m_intMaximumLength)

            {

                return new ValidationResult(false, this.ErrorMessage);

            }

            return result;

        }

    }
 
}

本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/archive/2011/12/26/2172466.html，如需转载请自行联系原作者