为什么要使用FluentValidation

1.在日常的开发中，需要验证参数的合理性，不紧前端需要验证传毒的参数，后端也需要验证参数
2.在领域模型中也应该验证,做好防御性的编程是一种好的习惯（其实以前重来不写的，被大佬教育了一番）
3.FluentValidation 是.NET 开发的验证框架，开源,主要是简单好用，内置了一些常用的验证器，可以直接使用，扩展也很方便

使用FluentValidation

1.引入FluentValidation.AspNetCore NuGet包
2.建立需要验证的类

/// <summary>/// 创建客户/// </summary>public class CreateCustomerDto{ /// <summary> /// 客户姓名 /// </summary> public string CustomerName { get; set; } /// <summary> /// 客户年龄 /// </summary> public string CustomerAge { get; set; } /// <summary> /// 客户电话 /// </summary> public string CustomerPhone { get; set; } /// <summary> /// 客户地址 /// </summary> public Address CustomerAddress { get; set; }}/// <summary>/// 验证/// </summary>public class CreateCustomerDtoValidator : AbstractValidator<CreateCustomerDto>{ public CreateCustomerDtoValidator() { RuleFor(x => x.CustomerName) .NotEmpty() .WithMessage("客户姓名不能为空"); RuleFor(x => x.CustomerPhone) .NotEmpty() .WithMessage("客户电话不能为空"); }}

3.统一返回验证的信息，ResponseResult为全局统一参数返回的类

/// <summary> /// 添加AddFluentValidationErrorMessage /// </summary> /// <returns></returns> public DependencyInjectionService AddFluentValidationErrorMessage() { _services.Configure<ApiBehaviorOptions>(options => { options.InvalidModelStateResponseFactory = (context) => { var errors = context.ModelState .Values .SelectMany(x => x.Errors .Select(p => p.ErrorMessage)) .ToList(); var result = new ResponseResult<List<string>> { StatusCode = "00009", Result = errors, Message = string.Join(",", errors.Select(e => string.Format("{0}", e)).ToList()), IsSucceed = false }; return new BadRequestObjectResult(result); }; }); return _dependencyInjectionConfiguration; }

4.注入验证的类

使用builder.RegisterType().As<IValidator>();比较麻烦每次新增都需要添加一次注入
所以我们使用批量的注入，来减少麻烦,通过反射获取所有的验证的类批量注入

/// <summary> /// 添加MVC /// </summary> /// <returns></returns> public DependencyInjectionService AddMvc() { _services.AddControllers(options => { options.Filters.Add(typeof(LogHelper)); }).AddJsonOptions(options => { //忽略循环引用 //options.JsonSerializerOptions.IgnoreReadOnlyProperties = true; }).AddFluentValidation(options => { options.RunDefaultMvcValidationAfterFluentValidationExecutes = false; var validatorList = GetFluentValidationValidator("ConferenceWebApi"); foreach (var item in validatorList) { options.RegisterValidatorsFromAssemblyContaining(item); } }); return _dependencyInjectionConfiguration; } /// <summary> /// 获取所有的FluentValidation Validator的类 /// </summary> public IEnumerable<Type> GetFluentValidationValidator(string assemblyName) { if (assemblyName == null) throw new ArgumentNullException(nameof(assemblyName)); if (string.IsNullOrEmpty(assemblyName)) throw new ArgumentNullException(nameof(assemblyName)); var implementAssembly = RuntimeHelper.GetAssembly(assemblyName); if (implementAssembly == null) { throw new DllNotFoundException($"the dll ConferenceWebApi not be found"); } var validatorList = implementAssembly.GetTypes().Where(e => e.Name.EndsWith("Validator")); return validatorList; }

5.使用起来就十分简单了

/// <summary> /// 创建客户 /// </summary> /// <param name="input"></param> /// <returns></returns> [HttpPost] public async Task<ResponseResult<string>> CreateCustomer([FromBody] CreateCustomerDto input) { var createCustomerCommand = new CreateCustomerCommand(input.CustomerName,input.CustomerAge,input.CustomerPhone,input.CustomerAddress); await _commandService.SendCommandAsync(createCustomerCommand); var result = new ResponseResult<string> { IsSucceed = true, Result = "创建客户成功！" }; return result; }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。