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我正在开发一个 SOAP 服务,我需要<?xml version="1.0" encoding="UTF-8"?>在传出消息的顶部发送一个格式化的错误消息。

成功的响应在响应顶部没有此版本文本。

我这样做的原因是因为我们正在接管系统和原始供应商的提供,并且只获得了 WSDL 文件。

我有一种方法希望将消息更改为如下所示,但是,当我将其放入新消息中时,它<?xml version="1.0" encoding="UTF-8"?>会被删除。

    public Message ChangeString(Message oldMessage, string from, string to)
    {
        MemoryStream ms = new MemoryStream();
        XmlWriter xw = XmlWriter.Create(ms);
        oldMessage.WriteMessage(xw);
        xw.Flush();
        string body = Encoding.UTF8.GetString(ms.ToArray());
        xw.Close();

        body = body.Replace(from, to); ////  Can see the body being changed here. 

        ms = new MemoryStream(Encoding.UTF8.GetBytes(body));
        XmlDictionaryReader xdr = XmlDictionaryReader.CreateTextReader(ms, new XmlDictionaryReaderQuotas());
        Message newMessage = Message.CreateMessage(xdr, int.MaxValue, oldMessage.Version);
        newMessage.Properties.CopyProperties(oldMessage.Properties);
        return newMessage;
    }

调用代码如下

public void ProvideFault(Exception error, MessageVersion messageVersion, ref Message fault)
{
    var faultException = new FaultException(error.Message);
    var messageFault = faultException.CreateMessageFault();
    var message = Message.CreateMessage(messageVersion, messageFault, null);
    
    message = ChangeString(message, message.ToString(), $"<?xml version=\"1.0\" encoding=\"UTF-8\"?>{message.ToString()}");

    fault = new ProposalMessage(message);
}

所以,问题是,如何在顶部使用正确的 xml 编码向用户发送消息?

我得到的完整回应是

<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
    <SOAP-ENV:Fault>
        <faultcode>SOAP-ENV:Client</faultcode>
        <faultstring xml:lang="en-GB">Unable to satisfy web service request at this time.This may relate to the format or sequence of the requests, the status of the requested information or reflect a service issue.</faultstring>
    </SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

- - 编辑 -

var errorFormatter = new ErrorMessageFormatter(new CustomTextMessageEncoderFactory("text/xml", "UTF-8", messageVersion));
var errorByteArray = errorFormatter.WriteMessage(Message.CreateMessage(messageVersion, messageFault, null), int.MaxValue, BufferManager.CreateBufferManager(int.MaxValue, int.MaxValue));
var message = errorFormatter.ReadMessage(errorByteArray, BufferManager.CreateBufferManager(int.MaxValue, int.MaxValue));

fault = new ProposalMessage(message);

是我添加的内容,然后也从故障中删除了 SOAP-ENV。

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1 回答 1

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消息的版本和编码与使用的绑定有关。我们通常在绑定中修改消息的编码,如下:

 var binding = new BasicHttpBinding()
            {
                
                TextEncoding = Encoding.GetEncoding("UTF-8"),
            };

我们也可以通过自定义消息编码器来修改消息版本和编码,如下:

 public CustomTextMessageBindingElement(string encoding, string mediaType)
            : this(encoding, mediaType, MessageVersion.Soap11WSAddressing10)
        {
        }

        public CustomTextMessageBindingElement(string encoding)
            : this(encoding, "text/xml")
        {

        }

        public CustomTextMessageBindingElement()
            : this("UTF-8")
        {
        }

有关自定义消息编码器的更多信息,请参考以下链接:

https://docs.microsoft.com/en-us/dotnet/framework/wcf/samples/custom-message-encoder-custom-text-encoder

于 2020-06-22T05:07:06.347 回答