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