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[原创]谈谈WCF中的Data Contract(3):WCF Data Contract对Collection & Dictionary的支持

作者: Artech  来源: 博客园  发布时间: 2008-08-14 10:05  阅读: 2360 次  推荐: 0   原文链接   [收藏]  
摘要: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 DetailList)

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 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
OrderService,于是我们创建了一个OrderCollection Type:

 

namespace Artech.SpecialDataContract.Contract
{
    [DataContract]
    
public class Order
    
{
        [DataMember]
        
public Guid OrderID
        
getset; }

        [DataMember]
        
public DateTime OrderDate
        
getset; }
    }


    
public class OrderCollection : List<Order>
    
{

    }

}

下面是Service Contract的定义:

 

namespace Artech.SpecialDataContract.Contract
{
    [ServiceContract]
    
public interface IOrderManager
    
{
        [OperationContract(Name 
= "ProcessWithCollection")]
        
void Process(OrderCollection orders);
}

面是OrderCollection XSD中的呈现:

<?xml version="1.0" encoding="utf-8" ?>
<xs:schema elementFormDefault="qualified" targetNamespace="http://schemas.datacontract.org/2004/07/Artech.SpecialDataContract.Contract"
    xmlns:xs
="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://schemas.datacontract.org/2004/07/Artech.SpecialDataContract.Contract"
    xmlns:ser
="http://schemas.microsoft.com/2003/10/Serialization/">
  
<xs:import schemaLocation="http://artech/Artech.SpecialDataContract/OrderManagerService.svc?xsd=xsd1"
          namespace
="http://schemas.microsoft.com/2003/10/Serialization/" />
  
<xs:complexType name="ArrayOfOrder">
    
<xs:sequence>
      
<xs:element minOccurs="0" maxOccurs="unbounded" name="Order" nillable="true" type="tns:Order" />
    
</xs:sequence>
  
</xs:complexType>
  
<xs:element name="ArrayOfOrder" nillable="true" type="tns:ArrayOfOrder"/>
  
<xs:complexType
name="Order">
    
<xs:sequence>
      
<xs:element minOccurs="0" name="OrderDate" type="xs:dateTime"/>
      
<xs:element
minOccurs="0" name="OrderID" type="ser:guid"/>
    
</xs:sequence>
  
</xs:complexType>
  
<xs:element
name="Order" nillable="true" type="tns:Order"/>
</xs:schema>

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):

    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel""3.0.0.0")]
    [System.ServiceModel.ServiceContractAttribute(ConfigurationName
="OrderManagerService.IOrderManager")]
    
public interface IOrderManager 
        [System.ServiceModel.OperationContractAttribute(Action
="http://tempuri.org/IOrderManager/ProcessWithCollection", ReplyAction="http://tempuri.org/IOrderManager/ProcessWithCollectionResponse")]
        
void ProcessWithCollection(Artech.SpecialDataContract.Client.OrderManagerService.Order[] orders);
}

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 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:ArrayArrayListLinkedListGeneric ListCollectionBindingList 

Data Contract for Dictionary

前面的内容,我们分别讨论了基于GenericCollectionData Contract,接下来,我们来讨论最后一个特殊的数据类型的Data ContractDictionary

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 ContractOrder的定义:

namespace Artech.SpecialDataContract.Contract
{
    [ServiceContract]
    
public interface IOrderManager
    
{
        [OperationContract(Name 
= "ProcessWithCollection")]
        
void Process(OrderCollection orders);

        [OperationContract(Name 
= "ProcessWithDictionary")]
        
void Process(IDictionary<Guid, Order> orders);
    }

}

 

    [DataContract]
    
public class Order
    
{
        [DataMember]
        
public Guid OrderID
        
getset; }

        [DataMember]
        
public DateTime OrderDate
        
getset; }
    }

闲话少说,我们来看XSD

<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified" targetNamespace="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns:ser="http://schemas.microsoft.com/2003/10/Serialization/">
  
<xs:import schemaLocation="http://artech/Artech.SpecialDataContract/OrderManagerService.svc?xsd=xsd1" namespace="http://schemas.microsoft.com/2003/10/Serialization/"/>
  
<xs:import schemaLocation="http://artech/Artech.SpecialDataContract/OrderManagerService.svc?xsd=xsd2" namespace="http://schemas.datacontract.org/2004/07/Artech.SpecialDataContract.Contract"/>
  
<xs:complexType name="ArrayOfKeyValueOfguidOrder_SkVQi6O3">
    
<xs:annotation>
      
<xs:appinfo>
        
<IsDictionary xmlns="http://schemas.microsoft.com/2003/10/Serialization/">true</IsDictionary>
      
</xs:appinfo>
    
</xs:annotation>
    
<xs:sequence>
      
<xs:element minOccurs="0" maxOccurs="unbounded" name="KeyValueOfguidOrder_SkVQi6O3">
        
<xs:complexType>
          
<xs:sequence>
            
<xs:element name="Key" type="ser:guid"/>
            
<xs:element name="Value" nillable="true" type="q1:Order" xmlns:q1="http://schemas.datacontract.org/2004/07/Artech.SpecialDataContract.Contract"/>
          
</xs:sequence>
        
</xs:complexType>
      
</xs:element>
    
</xs:sequence>
  
</xs:complexType>
  
<xs:element name="ArrayOfKeyValueOfguidOrder_SkVQi6O3" nillable="true" type="tns:ArrayOfKeyValueOfguidOrder_SkVQi6O3"/>
</xs:schema>

Data Contract的名称为ArrayOfKeyValueOfguidOrder_SkVQi6O3=ArrayOfKeyValueOf+guidKey的类型)+OrderValue+_SkVQi6O3Hash 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Clientcode中的对应的定义:

    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel""3.0.0.0")]
    [System.ServiceModel.ServiceContractAttribute(ConfigurationName
="OrderManagerService.IOrderManager")]
    
public interface IOrderManager {               
        [System.ServiceModel.OperationContractAttribute(Action
="http://tempuri.org/IOrderManager/ProcessWithDictionary", ReplyAction="http://tempuri.org/IOrderManager/ProcessWithDictionaryResponse")]
        
void ProcessWithDictionary(System.Collections.Generic.Dictionary<System.Guid, Artech.SpecialDataContract.Client.OrderManagerService.Order> orders);
    }

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:

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