本节目录
介绍
Abp中在Application层集成了validation.
直接上代码吧.
DataAnnotations
这是微软提供的一套验证框架,只用引用程序集System.ComponentModel.DataAnnotations.
自带的各种特性标签就不说了,默认在MVC中已集成此验证.
这里说下验证方法:
static void Main(string[] args) { var obj = new object(); var rst = new StringLengthAttribute(10) { MinimumLength = 6 }.GetValidationResult("Never", new ValidationContext(obj) { DisplayName = "名称", MemberName = "Name" }); Console.WriteLine(rst); Console.ReadKey(); }运行结果:
ValidationResult对象
在MVC中,obj指的是验证的对象,DisplayName指DisplayName特性的Name值,Member指字段代码名.
ICustomValidate
该接口在标准验证结束后调用.
public interface ICustomValidate : IValidate { void AddValidationErrors(List<ValidationResult> results); }
通常会如下操作:
public class CreateTaskInput : IInput, ICustomValidate { public string Name { get; set; } public void AddValidationErrors(List<ValidationResult> results) { if (Name == "xx") { results.Add(new ValidationResult("Task 名非法")); } } }
当标准验证功能无法完成某些特定的验证功能,可以使用此接口.
IShouldNormalize
该接口并非验证字段,而是在验证完字段,离开验证过滤器前的时候执行.
一般在此接口做初始化或者其他操作.
public interface IShouldNormalize { void Normalize(); }如：
public class CreateTaskInput : IInput, IShouldNormalize { public string Name { get; set; } public void Normalize() { Name = DateTime.Now.ToShortDateString() + "-task"; } }
实现Abp Validation
在Abp中大致会经历这3个接口.
在这里,仿照Abp验证
先定义接口
public interface IInput { } public interface IShouldNormalize { void Normalize(); } public interface ICustomValidate { void AddValidationErrors(List<ValidationResult> results); }
定义Dto
public class CreateTaskInput : IInput, IShouldNormalize, ICustomValidate { [StringLength(10, MinimumLength = 5)] public string Name { get; set; } public void Normalize() { Name = DateTime.Now.ToShortDateString() + "-task"; } public void AddValidationErrors(List<ValidationResult> results) { if (Name == "xx") { results.Add(new ValidationResult("Task 名非法")); } } }
定义ApplicationService
public interface ITaskAppService { void CreateTask(CreateTaskInput input); } public class TaskAppService : ITaskAppService { public void CreateTask(CreateTaskInput input) { Console.WriteLine("进入CreateTask方法:" + input.Name); } }
定义拦截器
public class ValidateInterceptor : IInterceptor { public void Intercept(IInvocation invocation) { new MethodInvocationValidator(invocation.Arguments).Validate(); invocation.Proceed(); } }
验证逻辑
internal class MethodInvocationValidator { private readonly object[] _parameterValues; private readonly List<ValidationResult> _validationErrors; /// <summary> /// Creates a new <see cref="MethodInvocationValidator"/> instance. /// </summary> /// <param name="parameterValues">List of arguments those are used to call the <paramref name="method"/>.</param> public MethodInvocationValidator(object[] parameterValues) { _parameterValues = parameterValues; _validationErrors = new List<ValidationResult>(); } public void Validate() { //basic validate for (var i = 0; i < _parameterValues.Length; i++) { ValidateObjectRecursively(_parameterValues[i]); } //throw exception if (_validationErrors.Any()) { foreach (var validationResult in _validationErrors) { Console.WriteLine("{0}:{1}", validationResult.MemberNames.FirstOrDefault(), validationResult.ErrorMessage); } throw new Exception("有参数异常"); }
//normalize foreach (var parameterValue in _parameterValues) { if (parameterValue is IShouldNormalize) { (parameterValue as IShouldNormalize).Normalize(); } } } private void ValidateObjectRecursively(object validatingObject) { var properties = TypeDescriptor.GetProperties(validatingObject).Cast<PropertyDescriptor>(); foreach (var property in properties) { var validationAttributes = property.Attributes.OfType<ValidationAttribute>().ToArray(); if (validationAttributes.IsNullOrEmpty()) { continue; } var validationContext = new ValidationContext(validatingObject) { DisplayName = property.Name, MemberName = property.Name }; foreach (var attribute in validationAttributes) { var result = attribute.GetValidationResult(property.GetValue(validatingObject), validationContext); if (result != null) { _validationErrors.Add(result); } } } //custom validate if (validatingObject is ICustomValidate) { (validatingObject as ICustomValidate).AddValidationErrors(_validationErrors); } } }
执行
static void Main(string[] args) { using (var container = new WindsorContainer()) { container.Register(Component.For<IInterceptor, ValidateInterceptor>());//先注入拦截器 container.Kernel.ComponentRegistered += Kernel_ComponentRegistered; container.Register(Component.For<ITaskAppService, TaskAppService>()); var person = container.Resolve<ITaskAppService>(); person.CreateTask(new CreateTaskInput() { Name = "123" }); } Console.ReadKey(); } static void Kernel_ComponentRegistered(string key, Castle.MicroKernel.IHandler handler) { handler.ComponentModel.Interceptors.Add(new InterceptorReference(typeof(ValidateInterceptor))); }
将name改成"12345"
本文地址:http://neverc.cnblogs.com/p/5267425.html