ASP.NET Core custom validation attribute localization

ASP.NET Core custom validation attribute localization

ASP.NET Core provides support for localizing custom validation attributes using resource files. To localize a custom validation attribute, you can create a resource file that contains localized error messages for the attribute, and then apply the ErrorMessageResourceType and ErrorMessageResourceName properties to the attribute to specify the resource file and resource name.

Here's an example of how to localize a custom validation attribute in ASP.NET Core:

  1. Create a resource file for your localized error messages. For example, create a file named ValidationMessages.resx in your project's Resources folder.
  2. Add a new string resource to the ValidationMessages.resx file with a key that corresponds to the name of your custom validation attribute, followed by .Error. For example, if your custom validation attribute is named CustomRequiredAttribute, add a string resource with the key CustomRequiredAttribute.Error.
  3. Set the value of the CustomRequiredAttribute.Error resource to the localized error message you want to display.
  4. In your custom validation attribute class, set the ErrorMessageResourceType property to the type of the resource file (in this case, typeof(Resources.ValidationMessages)), and set the ErrorMessageResourceName property to the name of the resource key (in this case, "CustomRequiredAttribute.Error").

Here's an example of a custom validation attribute that uses localized error messages:

using System.ComponentModel.DataAnnotations; using Resources; public class CustomRequiredAttribute : RequiredAttribute { public CustomRequiredAttribute() { ErrorMessageResourceType = typeof(ValidationMessages); ErrorMessageResourceName = "CustomRequiredAttribute.Error"; } }

In this example, the CustomRequiredAttribute class derives from RequiredAttribute to provide a custom implementation of required field validation. The ErrorMessageResourceType property is set to typeof(ValidationMessages) to specify the type of the ValidationMessages.resx resource file, and the ErrorMessageResourceName property is set to "CustomRequiredAttribute.Error" to specify the key of the error message for this attribute.

When the attribute is applied to a model property and validation fails, ASP.NET Core will look up the localized error message in the ValidationMessages.resx resource file and display it to the user.

Examples

  1. "ASP.NET Core custom validation attribute localization example"

    • Code:
      public class CustomValidationAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var errorMessage = GetLocalizedErrorMessage(validationContext); // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(errorMessage) } private string GetLocalizedErrorMessage(ValidationContext validationContext) { // Your logic to retrieve localized error message based on validation context // Example: LocalizationService.GetString("CustomValidationErrorMessage") } } public class YourModel { [CustomValidation] public string YourProperty { get; set; } }
    • Description: Demonstrates how to create a custom validation attribute with localization support.

  2. "ASP.NET Core custom validation attribute with localized error message"

    • Code:
      public class CustomValidationAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var localizedErrorMessage = Localizer["CustomValidationErrorMessage"]; // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(localizedErrorMessage) } [Inject] public IStringLocalizer<YourResourceFile> Localizer { get; set; } }
    • Description: Shows how to use IStringLocalizer for localized error messages in a custom validation attribute.

  3. "ASP.NET Core custom validation attribute with localized parameters"

    • Code:
      public class RangeValidationAttribute : ValidationAttribute { private readonly int _minValue; private readonly int _maxValue; public RangeValidationAttribute(int minValue, int maxValue) { _minValue = minValue; _maxValue = maxValue; } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var localizedErrorMessage = Localizer["RangeValidationErrorMessage", _minValue, _maxValue]; // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(localizedErrorMessage) } [Inject] public IStringLocalizer<YourResourceFile> Localizer { get; set; } }
    • Description: Illustrates how to include localized parameters in a custom validation attribute.

  4. "ASP.NET Core custom validation attribute with localized resources"

    • Code:
      public class CustomValidationAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var localizedErrorMessage = Localizer["CustomValidationErrorMessage"]; // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(localizedErrorMessage) } [Inject] public IStringLocalizer<YourResourceFile> Localizer { get; set; } }
    • Description: Demonstrates how to use localized resources in a custom validation attribute.

  5. "ASP.NET Core custom validation attribute with localized error code"

    • Code:
      public class CustomValidationAttribute : ValidationAttribute { private readonly string _errorCode; public CustomValidationAttribute(string errorCode) { _errorCode = errorCode; } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var localizedErrorMessage = Localizer[_errorCode]; // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(localizedErrorMessage) } [Inject] public IStringLocalizer<YourResourceFile> Localizer { get; set; } }
    • Description: Shows how to use a localized error code in a custom validation attribute.

  6. "ASP.NET Core custom validation attribute with dynamic localization"

    • Code:
      public class DynamicValidationAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var propertyName = validationContext.MemberName; var localizedErrorMessage = Localizer["DynamicValidationErrorMessage", propertyName]; // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(localizedErrorMessage) } [Inject] public IStringLocalizer<YourResourceFile> Localizer { get; set; } }
    • Description: Demonstrates how to dynamically localize error messages based on property names in a custom validation attribute.

  7. "ASP.NET Core custom validation attribute with multiple localized error messages"

    • Code:
      public class MultipleErrorsValidationAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var localizedErrorMessage1 = Localizer["Error1"]; var localizedErrorMessage2 = Localizer["Error2"]; // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(localizedErrorMessage1) or new ValidationResult(localizedErrorMessage2) } [Inject] public IStringLocalizer<YourResourceFile> Localizer { get; set; } }
    • Description: Illustrates how to handle multiple localized error messages in a custom validation attribute.

  8. "ASP.NET Core custom validation attribute with culture-specific localization"

    • Code:
      public class CultureSpecificValidationAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var cultureSpecificErrorMessage = Localizer.WithCulture(new CultureInfo("en-US"))["CultureSpecificValidationErrorMessage"]; // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(cultureSpecificErrorMessage) } [Inject] public IStringLocalizer<YourResourceFile> Localizer { get; set; } }
    • Description: Demonstrates how to perform culture-specific localization in a custom validation attribute.

  9. "ASP.NET Core custom validation attribute with resource fallback"

    • Code:
      public class FallbackValidationAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var localizedErrorMessage = Localizer["FallbackValidationErrorMessage"]; // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(localizedErrorMessage) } [Inject] public IStringLocalizer<YourResourceFile> Localizer { get; set; } }
    • Description: Shows how to handle resource fallback in a custom validation attribute.

  10. "ASP.NET Core custom validation attribute with localized default error message"

    • Code:
      public class LocalizedDefaultMessageAttribute : ValidationAttribute { public LocalizedDefaultMessageAttribute() { ErrorMessage = Localizer["DefaultValidationErrorMessage"]; } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { // Your custom validation logic here // Return ValidationResult.Success if validation passes, otherwise return new ValidationResult(ErrorMessage) } [Inject] public IStringLocalizer<YourResourceFile> Localizer { get; set; } }
    • Description: Demonstrates how to set a localized default error message in a custom validation attribute.

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