如何使用 Fluent Validation 检查 C# 中属性的最小长度和最大长度验证？

MaxLength Validator

Ensures that the length of a particular string property is no longer than the specified value.

Only valid on string properties

String format args:

{PropertyName} = The name of the property being validated

{MaxLength} = Maximum length

{TotalLength} = Number of characters entered

{PropertyValue} = The current value of the property

MinLength Validator

Ensures that the length of a particular string property is longer than the specified value.

Only valid on string properties

{PropertyName} = The name of the property being validated

{MinLength} = Minimum length

{TotalLength} = Number of characters entered

{PropertyValue} = The current value of the property

Example

static void Main(string[] args){ List errors = new List(); PersonModel person = new PersonModel(); person.FirstName = "TestUser444"; person.LastName = "TTT"; PersonValidator validator = new PersonValidator(); ValidationResult results = validator.Validate(person); if (results.IsValid == false){ foreach (ValidationFailure failure in results.Errors){ errors.Add(failure.ErrorMessage); } } foreach (var item in errors){ Console.WriteLine(item); } Console.ReadLine(); } } public class PersonModel{ public string FirstName { get; set; } public string LastName { get; set; } } public class PersonValidator : AbstractValidator{ public PersonValidator(){ RuleFor(p => p.FirstName).MaximumLength(7).WithMessage("MaximumLength must be 7 {PropertyName}") ; RuleFor(p => p.LastName).MinimumLength(5).WithMessage("MinimumLength must be 5 {PropertyName}"); } }登录后复制