為了驗證api post上來的數據的有效性，我們可以引入FluentValidation(詳見https://fluentvalidation.net)。在asp.net mvc中，使用的是模型驗證，通過在實體類上添加特性達到驗證效果。

FluentValidation的原理是通過實現AbstractValidator<T>來實現對T實體類的驗證，通過不同折Rule來驗證T中的屬性（更多驗證規則 ，參見官網），見如下實現：

public class Person {public int Id { get; set; }public string Name { get; set; }public string Tel { get; set; }public string Email { get; set; }public DateTime Birthday { get; set; }public string IDCard { get; set; }public PersonAddress Address { get; set; } } public class PersonAddress {public string Country { get; set; }public string Province { get; set; }public string City { get; set; }public string County { get; set; }public string Address { get; set; }public string Postcode { get; set; } }/// <summary> /// Person驗證 /// </summary> public class PersonValidator : AbstractValidator<Person> {public PersonValidator(IPersonService personService){RuleFor(p => p.Name).NotNull().NotEmpty();RuleFor(p => p.Email).NotNull().EmailAddress();RuleFor(p => p.Birthday).NotNull();RuleFor(p => p.IDCard).NotNull().NotEmpty().Length(18).When(p => (DateTime.Now > p.Birthday.AddYears(1))).WithMessage(p => $"出生日期為{p.Birthday}，現在時間為{DateTime.Now},大于一歲，CardID值必填！");RuleFor(p => p.Tel).NotNull().Matches(@"^(\d{3,4}-)?\d{6,8}$|^[1]+[3,4,5,8]+\d{9}$").WithMessage("電話格式為：0000-0000000或13000000000");RuleFor(p => p.Address).NotNull();RuleFor(p => p.Address).SetValidator(new PersonAddressValidator());//通過調用外部方法來驗證RuleFor(p => p.Id).Must(id => personService.IsExist(id)).WithMessage(p => $"不存在id={p.Id}的用戶");} } /// <summary> /// Person Address驗證 /// </summary> public class PersonAddressValidator : AbstractValidator<PersonAddress> {public PersonAddressValidator(){RuleFor(a => a.Country).NotNull().NotEmpty();RuleFor(a => a.Province).NotNull().NotEmpty();RuleFor(a => a.City).NotNull().NotEmpty();RuleFor(a => a.County).NotNull().NotEmpty();RuleFor(a => a.Address).NotNull().NotEmpty();RuleFor(a => a.Postcode).NotNull().NotEmpty().Length(6);} }

在mini api引入FluentValidation也很簡單，可以通過注入IValidator<T>實現，也可以注放AddFluentValidation，用IValidatorFactory來獲取Validator來實現驗證，代碼如下：

using FluentValidation; using FluentValidation.AspNetCore; using System.Text;var builder = WebApplication.CreateBuilder(args); builder.Services.AddFluentValidation(); builder.Services.AddScoped<IValidator<Person>, PersonValidator>(); builder.Services.AddScoped<IPersonService, PersonService>(); var app = builder.Build();app.MapPost("/person", async (IValidator<Person> validator, Person person) =>{var result = await validator.ValidateAsync(person);if (!result.IsValid){var errors = new StringBuilder();foreach (var valid in result.Errors){errors.AppendLine(valid.ErrorMessage);}return errors.ToString();}return "OK";});app.MapPost("/person1", async (IValidatorFactory validatorFactory, Person person) => {var result = await validatorFactory.GetValidator<Person>().ValidateAsync(person);if (!result.IsValid){var errors = new StringBuilder();foreach (var valid in result.Errors){errors.AppendLine(valid.ErrorMessage);}return errors.ToString();}return "OK"; });app.MapPost("/person2", async (IValidatorFactory validatorFactory, Person person) => {var result = await validatorFactory.GetValidator(typeof(Person)).ValidateAsync(new ValidationContext<Person>(person));if (!result.IsValid){var errors = new StringBuilder();foreach (var valid in result.Errors){errors.AppendLine(valid.ErrorMessage);}return errors.ToString();}return "OK"; });app.Run();public interface IPersonService {public bool IsExist(int id); } public class PersonService : IPersonService {public bool IsExist(int id){if (DateTime.Now.Second % 2 == 0){return false;}else{return true;}} }

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