WPF 验证控件

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;
        }
    }



 


}