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[ASP.net教程][Architect] Abp 框架原理解析 Validation


本节目录

  • 介绍
  • DataAnnotations
  • ICustomValidate
  • IShouldNormalize
  • 实现Abp Validation

 

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