Question

我正在使用asp.net mvc 5.我有List<string>这样：

var animals = new List<string>
{
   "Dog",
   "Cat"
};

animals只能包含2个值：Dog和Cat。因此，如果值为Tiger或Lion，该广告无效。

以下是我用来验证的基本方法：

var regex = new Regex(@"Dog|Cat");
foreach (string animal in animals)
{
   if (!regex.IsMatch(animal))
   {
      // throw error message here...
   }
}

现在，我想声明一个模型Animal来存储List：

class Animal
{
   //[RegularExpression(@"Dog|Cat", ErrorMessage = "Invalid animal")]
   public List<string> Animals { get; set; }
}

并采取一些行动：

public ActionResult Add(Animal model)
{
   if (ModelState.IsValid)
   {
      // do stuff...
   }
   // throw error message...
}

所以，我的问题是：在这种情况下如何使用正则表达式来验证List<string>的值？

Answer 1

您可以编写自己的属性：

export class ConditionBuilderComponent implements OnInit {
conditions: Condition[] = [];
catalog: Condition[] = [];

constructor(public _conditionService: ConditionService) { }

getConditions() {
    this._conditionService.getConditions().then(conditions => this.catalog = conditions);
}

ngOnInit() {
    this.getConditions();
}

stringify(o:any): string {
    return JSON.stringify(o);
}

onChange(conditionsIndex, selectedCondition:string): void {
    console.log(typeof selectedCondition);
    //JSON.parse(selectedCondition);
    console.log(selectedCondition);
    //this.conditions[conditionsIndex] = this.catalog[condition];
    console.log(typeof selectedCondition);
}

在public class ListIsValid : ValidationAttribute { public override bool IsValid(List animals) { var regex = new Regex(@"Dog|Cat"); foreach (string animal in animals) { if (!regex.IsMatch(animal)) { return false; } } return true; } }课程中，您可以像这样使用它：

Animal

Answer 2

定义自定义验证属性并在那里实现自定义逻辑。

<Grid x:Name="LayoutRoot" Background="{StaticResource AppBackGroundColor}">
    <VisualStateManager.VisualStateGroups>
        <VisualStateGroup>
            <VisualState>
                <VisualState.StateTriggers>
                    <AdaptiveTrigger MinWindowWidth="0" />
                </VisualState.StateTriggers>
                <VisualState.Setters>
                    <Setter Target="LoginImage.Height" Value="60" />
                    <Setter Target="LoginImage.Width" Value="60" />
                    <Setter Target="Headertxt1.FontSize" Value="25" />
                    <Setter Target="Headertxt2.FontSize" Value="20" />
                    <Setter Target="EmailTxtBox.Height" Value="30" />
                    <Setter Target="PwdBox.Height" Value="30" />
                    <Setter Target="LoginButton.FontSize" Value="25" />
                    <Setter Target="ForgotPwdButton.FontSize" Value="20" />
                </VisualState.Setters>
            </VisualState>
            <VisualState>
                <VisualState.StateTriggers>
                    <AdaptiveTrigger MinWindowWidth="720" />
                </VisualState.StateTriggers>
                <VisualState.Setters>
                    <Setter Target="LoginImage.Height" Value="90" />
                    <Setter Target="LoginImage.Width" Value="80" />
                    <Setter Target="Headertxt1.FontSize" Value="30" />
                    <Setter Target="Headertxt2.FontSize" Value="23" />
                    <Setter Target="EmailTxtBox.Height" Value="50" />
                    <Setter Target="PwdBox.Height" Value="50" />
                    <Setter Target="LoginButton.FontSize" Value="38" />
                    <Setter Target="ForgotPwdButton.FontSize" Value="24" />
                </VisualState.Setters>
            </VisualState>
        </VisualStateGroup>
    </VisualStateManager.VisualStateGroups>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" MinHeight="517" />
    </Grid.RowDefinitions>

    <Grid Grid.Row="2">

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width=".15*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Image Source="/Images/login.png"
           Grid.Column="0"
           x:Name="LoginImage" />
        <Grid Grid.Column="1"
          HorizontalAlignment="Left"
          VerticalAlignment="Center">

            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>
            <TextBlock Text="Login"
                   Name="Headertxt1"
                   Foreground="{StaticResource AppFontColor}"
                   Grid.Row="0"
                   FontWeight="Bold" />

            <TextBlock
                   Name="Headertxt2"
                   Foreground="{StaticResource AppFontColor}"
                   Grid.Row="1"
                   TextWrapping="Wrap" />
        </Grid>
    </Grid>

    <Grid Grid.Row="3" Margin="0,25,0,0">

        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <TextBox
             Style="{StaticResource MediumSizeTextBoxStyle}"
             Grid.Row="0"
             Name="EmailTxtBox"
             Height="50"
             InputScope="EmailSmtpAddress"
             Margin="12,0,12,10" />

        <PasswordBox Name="PwdBox"
                 Grid.Row="1"
                 Style="{StaticResource MediumSizePwdBoxStyle}"
                 Margin="12,10,12,4"
                 Height="50" />

        <Button Content="Login"
            Grid.Row="2"
            Margin="12,20,12,0"
            x:Name="LoginButton"
            BorderThickness="0"
            Foreground="Black"
            Background="White"
            HorizontalAlignment="Stretch" />

        <Button Content="Forgot Password"
            Grid.Row="3"
            Foreground="{StaticResource AppFontColor}"
            FontSize="24"
            Margin="0,10,0,10"
            HorizontalAlignment="Center"
            Name="ForgotPwdButton"
            BorderThickness="0" />
    </Grid>

    <Image x:Name="Header_logo"
       Source="/Images/rbkc_logo.png"
       HorizontalAlignment="Center"
       VerticalAlignment="Center"
       Visibility="Collapsed"
       Margin="0,10,0,10"
       Width="480"
       Height="121" />

    <Button x:Name="backButton" Margin="39,59,39,0"
                Style="{StaticResource NavigationBackButtonNormalStyle}"
                VerticalAlignment="Top"
                AutomationProperties.Name="Back" />
</Grid>

请注意，无需使用正则表达式

Answer 3

基于diiN's answer：

public boolean deleteS3Object(String multipartKey) {
       
        if(StringUtils.isNotBlank(multipartKey)) { 
            DeleteObjectRequest deleteObjectRequest = DeleteObjectRequest.builder().bucket("S3Bucket1").key(multipartKey).build();
            DeleteObjectResponse deleteObjectResponse = s3Client.deleteObject(deleteObjectRequest);
            if (deleteObjectResponse != null && deleteObjectResponse.sdkHttpResponse() != null) {
                return deleteObjectResponse.sdkHttpResponse().isSuccessful();
            }
        }
        return false;
    }

用法：

public class RegularExpressionListAttribute : RegularExpressionAttribute
{
    public RegularExpressionListAttribute(string pattern)
        : base(pattern) { }

    public override bool IsValid(object value)
    {
        if (value is not IEnumerable<string>)
            return false;

        foreach (var val in value as IEnumerable<string>)
        {
            if (!Regex.IsMatch(val, Pattern))
                return false;
        }

        return true;
    }
}

通过模型注释中的正则表达式验证List <string>

3 个答案: