Enterprise Library 3.0 体验(2):使用Validation Application Block
摘要:在Enterprise Library 3.0 December 2006 CTP版中,加入了一个新的成员Validation Application Block,用来实现对业务对象的验证。它支持两种方式的验证,通过特性Attribute和通过配置文件,但是在最新版本中并没有提供配置的设计时支持,我们只能通过手动去修改配置文件来实现,所以本文主要看一下通过Attribute来实现验证。
主要内容
1.通过ValidationFactory创建验证器
2.通过外观类实现验证
一.概述
在Enterprise Library 3.0 December 2006 CTP版中,加入了一个新的成员Validation Application Block,用来实现对业务对象的验证。它支持两种方式的验证,通过特性Attribute和通过配置文件,但是在最新版本中并没有提供配置的设计时支持,我们只能通过手动去修改配置文件来实现,所以本文主要看一下通过Attribute来实现验证。
二.通过ValidationFactory创建验证器
Validation Application Block沿用了其他应用程序块的一贯做法,使用相同的操作模式,为我们提供了一个ValidationFactory的工厂,用来创建验证器。首先我们编写一个简单的业务对象类:
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这只是一个普通的业务实体类,现在我们要验证它的姓名属性不能为空,且长度在1到50之间,年龄字段在0到200之间,加上如下Attribute:
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在Validation Application Block中,现在已经提供的验证器有:
l AndCompositeValidator
l Int32RangeValidator
l NotNullValidator
l NullValidator
l OrCompositeValidator
l RangeValidator
l StringLengthValidator
l ValidNumberValidator
l ValueAccessValidator
现在就可以进行验证了,如下面的代码片断所示:
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首先使用ValidationFactory创建Validator,再调用Validator的Validate方法进行验证,返回的结果ValidationResults是一个ValidationResult的集合,包含了错误信息,我们可以通过Key和Message属性来显示错误信息,如下所示:
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三.通过外观类实现验证
用过Logging Application Block的朋友都知道,在Logging Application Block中为我们提供了一个Logger的外观类,简化了记录日志。同样在Validation Application Block中,为我们提供了一个Validation的外观类,不需要再使用ValidationFactory。如下面的代码片断所示:
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可以看到,Validation Application Block沿用了Enterprise Library的一贯操作模式,使用起来也非常的简单。如果提供的验证器不能满足实际开发的需要,也可以很轻松的创建自定义的验证其。关于Validation Application Block就简单得介绍到这儿。
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