WCF 代理未正确生成

Question

我有一个 WCF 服务，需要从数据库返回一个文件。为此，我创建了两个 MessageContract 类，一个用于输入，一个用于输出。代码如下：

[MessageContract]
public class AttachmentFile
{
    [MessageHeader(MustUnderstand = true)]
    public Int32 AttachmentID;

    [MessageHeader]
    public String FileName;

    [MessageBodyMember(Order = 1)]
    public Stream Data;

    public AttachmentFile(Attachment att)
    {
        AttachmentID = (Int32)att.AttachmentID;
        FileName = att.FileName;
        Data = new MemoryStream(att.FileBytes);
    }
}

[MessageContract]
public class AttachmentFileID
{
    [MessageBodyMember]
    public Int32 AttachmentID;
}

public AttachmentFile GetAttachmentFile(AttachmentFileID AttachmentID)
{
}

生成的 WSDL 看起来正确：

<wsdl:operation name="GetAttachmentFile">
    <soap12:operation soapAction="http://tempuri.org/IAttachments/GetAttachmentFile" style="document"/>
    <wsdl:input name="AttachmentFileID">
        <soap12:body use="literal"/>
    </wsdl:input>
    <wsdl:output name="AttachmentFile">
        <soap12:header message="i0:AttachmentFile_Headers" part="AttachmentID" use="literal"/>
        <soap12:header message="i0:AttachmentFile_Headers" part="FileName" use="literal"/>
        <soap12:body use="literal"/>
    </wsdl:output>
</wsdl:operation>

但是，当我运行 svcutil.exe http:// localhost:8002/IAttachments?wsdl，生成的代码如下：

public string GetAttachmentFile(ref int AttachmentID, out System.IO.Stream Data)
{
    AttachmentFileID inValue = new AttachmentFileID();
    inValue.AttachmentID = AttachmentID;
    AttachmentFile retVal = ((IAttachments)(this)).GetAttachmentFile(inValue);
    AttachmentID = retVal.AttachmentID;
    Data = retVal.Data;
    return retVal.FileName;
}

我确信我错过了一些简单的东西，但我似乎找不到它是什么。有谁知道可能导致此问题的原因吗？

Answer 1

经过进一步检查代码，/messageContract 开关修​​复了其中一个调用，结果却搞砸了另一个调用。但是，使用 /importXmlTypes 开关修复了所有问题。