web服务响应使用MessageContract时变成ref参数 [英] Webservice Response is turned into ref parameter when using MessageContract

问题描述

我已经定义了以下接口

[ServiceContract]
public interface IHealthProducts
{
    [OperationContract()]
    ResponseClass OrderSelfSignedHealthCertificate();
}

它返回以下类型

Which returns the following type

[MessageContract]
public class ResponseClass
{
    [MessageBodyMember]
    public string AnimalSpeciesCode
    {
        get;
        set;
    }

    [MessageBodyMember]
    public int VBN
    {
        get;
        set;
    }
}

我期望生成的客户端code会暴露在以下方式OrderSelfSignedHealthCertificate方法：

I expected that the generated client code would expose the OrderSelfSignedHealthCertificate method in the following way:

HealthProductsClient client = new HealthProductsClient();
ResponseClass response = client.OrderSelfSignedHealthCertificate();

相反，属性的 ResponseClass 的未包裹在ResponseClass，但像这样暴露：

Instead, the properties of ResponseClass aren't wrapped in the ResponseClass, but exposed like so:

string OrderSelfSignedHealthCertificate(out int VBN)

当我交换MessageContract一个DataContract属性和MessageBodyMember的数据成员属性，我得到预期的行为（ResponseClass响应类型）。 我需要的MessageContract但是，因为我需要把一些属性在SOAP头。

When I exchange the MessageContract for a DataContract attribute and the MessageBodyMember for a DataMember attribute, I get the expected behaviour (ResponseClass response type). I need the MessageContract however, because I need to put some of the properties in the SOAP header.

我是不是做错了什么？这是正常的行为呢？我如何获得的 ResponseClass 的返回类型，使用MessageContract什么时候？

Am I doing something wrong? Is this normal behaviour? How do I get a ResponseClass return type, when using a MessageContract?

任何帮助非常AP preciated。

Any help greatly appreciated.

推荐答案

在你的 [MessageContract] 包含多个 [MessageBodyMember] ，则WCF将返回第一个从（你的情况 AnimalSpecies code ）的服务调用的返回值，以及所有其他被返回退出或 REF paraemters。

When your [MessageContract] contains more than one [MessageBodyMember], then WCF will return the first one as return value from the service call (AnimalSpeciesCode in your case), and all others are returned as out or ref paraemters.

您可以通过让解决这个问题只有一个 [MessageBodyMember] 封装了你需要有回报，这样的事情的所有项目的消息的合同：

You can solve this by having only a single [MessageBodyMember] in your message contract that encapsulates all items you need to have return, something like this:

[DataContract]
class CompoundData
{
    public string AnimalSpeciesCode { get; set; }
    public int VBN { get; set; }
}

[MessageContract]
public class ResponseClass
{
    [MessageBodyMember]
    public CompoundData Payload { get; set; }
}

在这种情况下， CompoundData 应该是从你的服务调用的返回值 - 包含你需要两个元素

In this case, the CompoundData should be the return value from your service call - containing both elements you need.

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