WCF中DataContract和MessageContract的区别

大雨瓢泼兮,吾之编程味浓;

算法精妙兮,纵女色难动容;

形单影只兮,犹奶茶无珍珠。

 

欤,念余一身才气,却无从施展,年方二八,然垂垂老矣。

 

本文代码下载:Minmin.zip 

首选建立2个WCF Service,它们分别使用不同的Contract,同时创建一个Console控制台项目,作为Client:

image

其中,WcfServiceWithDataContract项目使用DataContract,具体表现为将实体类标记为[DataContract]:

[DataContract]
public class BookOrder
{
    [DataMember]
    public string ISBN { get; set; }

    [DataMember]
    public string BookTitle { get; set; }


    [DataMember]
    public string BookAddress { get; set; }
}

注:即使不添加特性DataContract,仍然默认为DataContract。

 

而WcfServiceWithMessageContract项目使用MessageContract,具体表现为将实体类标记为[DataContract]:

[MessageContract]
public class BookOrder
{
    [MessageHeader]
    public string ISBN { get; set; }

    [MessageBodyMember]
    public string BookTitle { get; set; }

    [MessageBodyMember]
    public string BookAddress { get; set; }
}

 

但是,两个Service的Operation都是相同的:

public BookOrder PlaceOrder(BookOrder bookOrder)
{
    return new BookOrder() { ISBN = "2", BookTitle = "WPF", BookAddress = "China" };
}

为了观察到更多的端倪,我们将参数和返回值类型都设置为了BookOrder,方法的逻辑只是简单地将参数稍作修改并返回。

 

根据Service的Contract不同(2种),以及在Client端添加Service的方式的不同(也是2种),一共有2*2=4种情形,分析如下:

 

情形一:UseDCRefDC(在Server端使用DataContract,在Client端生成DataContract)

我们在Client端直接Add Service Reference,指向WcfServiceWithDataContract项目生成的Service:http://localhost:1111/Service1.svc

同时,在Client端默认生成DataContract:

image

 

在Client端(也就是Console控制台项目),调用Service的方式如下:

public static void TestUseDCRefDC()
{
    var client = new UseDCRefDC.Service1Client();
    var item = new UseDCRefDC.BookOrder() { ISBN = "1", BookAddress = "USA", BookTitle = "WCF" };
    var result = client.PlaceOrder(item);
}

 

情形二:UseMCRefDC(在Server端使用DataContract,在Client端生成MessageContract)

仍然添加对WcfServiceWithDataContract这个WCF Service的引用,并点击Add Service Reference面板中的Advanced按钮,弹出Service Reference Settings面板,将“Always generate message contracts”选项选中:

image

这时在Client端生成的是MessageContract。

在Client端(也就是Console控制台项目),调用Service的方式如下:

public static void TestUseMCRefDC()
{
    var client = new UseMCRefDC.Service1Client();
    var item = new UseMCRefDC.BookOrder() { ISBN = "1", BookAddress = "USA", BookTitle = "WCF" };

    PlaceOrderRequest request = new PlaceOrderRequest(item);
    PlaceOrderResponse response = client.PlaceOrder(request);

    var result = response.PlaceOrderResult;
}

 

 

情形三:UseDCRefMC(在Server端使用MessageContract,在Client端生成DataContract)

 

public static void TestUseDCRefMC()
{
    var client = new UseDCRefMC.Service2Client();
    var item = new UseDCRefMC.BookOrder() { ISBN = "1", BookAddress = "USA", BookTitle = "WCF" };

    client.PlaceOrder(ref item.ISBN, ref item.BookAddress, ref item.BookTitle);
}

 

情形四:UseMCRefMC(在Server端使用MessageContract,在Client端生成MessageContract)

 

public static void TestUseMCRefMC()
{
    var client = new UseMCRefMC.Service2Client();
    var item = new UseMCRefMC.BookOrder() { ISBN = "1", BookAddress = "USA", BookTitle = "WCF" };

    var result = client.PlaceOrder(item);
}
posted @ 2010-05-08 23:15  包建强  Views(7291)  Comments(3Edit  收藏  举报