WPF 自动验证

WPF中TextBox的自动验证：

演示：

用以下两个TextBox分别显示验证IP和非空值验证，先看效果：

IP自动验证效果：

非空值自动验证效果：

第一步：定义TextBox验证的样式：

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

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

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

        <Setter Property="Validation.ErrorTemplate">

            <Setter.Value>

                <ControlTemplate>

                    <DockPanel LastChildFill="True">

                        <TextBlock DockPanel.Dock="Right"

                                           Foreground="Red" FontSize="" FontWeight="Bold"

                                           ToolTip="{Binding ElementName=adornerPlaceholder,

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

                                    *

                        </TextBlock>

                        <Border BorderBrush="Red" BorderThickness="" CornerRadius="">

                            <AdornedElementPlaceholder Name="adornerPlaceholder"></AdornedElementPlaceholder>

                        </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)[].ErrorContent}"/>

            </Trigger>

        </Style.Triggers>

    </Style>

</ResourceDictionary>

第二步：绑定上面的样式：

<TextBox x:Name="TxDataBaseIP" Style="{DynamicResource ValidationTextBoxStyle}" .....

<TextBox x:Name="TbDataBaseAcount" Style="{DynamicResource ValidationTextBoxStyle}" ......

第三步：为Text的Text属性定义和添加验证规则：

定义验证规则：

using System.Text.RegularExpressions;

using System.Windows.Controls;

namespace NCS.Client.WPF.Resources.Validations

{

    public class NotNullValidationRule : ValidationRule

    {

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

        {

            if (string.IsNullOrEmpty(value as string) || string.IsNullOrWhiteSpace(value as string))

            {

                return new ValidationResult(false, "不能为空！");

            }

            return new ValidationResult(true, null);

        }

    }

    public class IPAddressRule : ValidationRule

    {

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

        {

            string IPAddress = value as string;

            if (!string.IsNullOrWhiteSpace(IPAddress))

            {

                string IPAddressFormartRegex = @"^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$";

                // 检查输入的字符串是否符合IP地址格式

                if (!Regex.IsMatch(IPAddress, IPAddressFormartRegex))

                {

                    return new ValidationResult(false, "IP地址格式不正确");

                }

            }

            return new ValidationResult(true, null);

        }

    }

}

绑定规则：

                            <TextBox.Text>
                                 <Binding Path="DataBaseIp" Mode="TwoWay" 
                                     UpdateSourceTrigger="PropertyChanged">
                                    <Binding.ValidationRules>
                                        <validations:IPAddressRule/>
                                    </Binding.ValidationRules>
                                 </Binding>
                            </TextBox.Text>

                        <TextBox.Text>

                            <Binding Path="DataBaseAccount"

                                     Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">

                                <Binding.ValidationRules>

                                    <validations:NotNullValidationRule/>

                                </Binding.ValidationRules>

                            </Binding>

                        </TextBox.Text>

完整的控件xaml代码：

                <StackPanel Orientation="Horizontal" Height="" VerticalAlignment="Top">

                    <TextBlock Text="数  据  库 IP" Width="" VerticalAlignment="Center"/>

                    <TextBox x:Name="TxDataBaseIP" Style="{DynamicResource ValidationTextBoxStyle}"

                             MaxWidth="" Width="" Height=""

                             HorizontalAlignment="Center" VerticalAlignment="Center">

                            <TextBox.Text>

                                 <Binding Path="DataBaseIp" Mode="TwoWay"

                                     UpdateSourceTrigger="PropertyChanged">

                                    <Binding.ValidationRules>

                                        <validations:IPAddressRule/>

                                    </Binding.ValidationRules>

                                 </Binding>

                            </TextBox.Text>

                    </TextBox>

                </StackPanel>

                <StackPanel Orientation="Horizontal" Height="" VerticalAlignment="Top">

                    <TextBlock Text="数据库账户" Width="" VerticalAlignment="Center"/>

                    <TextBox x:Name="TbDataBaseAcount" Style="{DynamicResource ValidationTextBoxStyle}"

                             MaxWidth="" Width="" Height=""

                             HorizontalAlignment="Center" VerticalAlignment="Center">

                        <TextBox.Text>

                            <Binding Path="DataBaseAccount"

                                     Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">

                                <Binding.ValidationRules>

                                    <validations:NotNullValidationRule/>

                                </Binding.ValidationRules>

                            </Binding>

                        </TextBox.Text>

                    </TextBox>

                </StackPanel>

【the end】

后记：

1.有个缺陷的：一开始初始化界面的时候没有进行验证，必须是输入一次，以后才进行验证。如下图所示：

　　2. 上面的文章描述是基于我的一个实际项目编写的，有网友可能需要源码,现在我从原来的项目中剥离出这部分知识的代码部分，所以下载到的源码与上述的代码的

命名空间不一致。

源码下载：

链接：http://pan.baidu.com/s/1jGE9V0q 密码：05g3

拓展学习：

　　Regex Validation in WPF

　　http://www.codeproject.com/Articles/15610/Regex-Validation-in-WPF

巴特西

WPF 自动验证

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