谈谈WCF中的Data Contract(3):WCF Data Contract对Collection & Dictionary的支持
谈谈WCF中的Data Contract(3):WCF Data Contract对Collection & Dictionary的支持
在本篇文章上一部分Order Processing的例子中,我们看到原本已Collection形式定义的DetailList属性(public IList<TDetail> DetailList),在Data Contract中却以Array的方式体现(public OrderDetail[] DetailList)。我们现在就来详细地讨论一下基于Collection & Dictionary 的Data Contract。
Data Contract for Collection
我们照例用例子来说明问题,在这里我们创建一个批量处理Order的Service,于是我们创建了一个OrderCollection Type:
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下面是Service Contract的定义:
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面是OrderCollection 在XSD中的呈现:
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加上通过Add Service Reference默认生成的Class,我们可以很清楚地看出Collection是以Array的形式呈现的(Artech.SpecialDataContract.Client.OrderManagerService.Order[] orders):
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因为Array相对很Common的数据类型,基本上所有的厂商均提供了对Array的支持,这也是WCF在通过Add Service Reference生成Client端代码的时候,会生成Array的原因。不过并不是我们只有唯一的选择,事实上VS为此提供了扩展,允许我们对于基于Collection 的Data Contract生成我们需要的各种类型,我们只需要在Add Service Reference的时候选择“Configure Service Reference”进行相应的配置:
通过上面的截图,我们发现在Collection Type一项我们有若干选项,我们可以选择我们希望生成的数据类型:Array,ArrayList,LinkedList,Generic List,Collection和BindingList。
Data Contract for Dictionary
前面的内容,我们分别讨论了基于Generic和Collection的Data Contract,接下来,我们来讨论最后一个特殊的数据类型的Data Contract:Dictionary。
延续上面的Order Batch Processing的例子,不过我们现在处理的不是一个OrderCollection对象,而是一个Dictionary对象,线面是Service Contract和Order的定义:
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闲话少说,我们来看XSD:
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Data Contract的名称为ArrayOfKeyValueOfguidOrder_SkVQi6O3=ArrayOfKeyValueOf+guid(Key的类型)+Order(Value)+_SkVQi6O3(Hash Value)。从该XSD的结构我们不难看出,只是一个数组,每个元素为Key-Value pair。
我们照例看看通过Add Service Reference方式生成的Client端code中的对应的定义:
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生成的是一个System.Collections.Generic.Dictionary类型。同Collection一样,也依然可以有多种选择: