[英]Composing a Message in IClientMessageFormatter.SerializeRequest (HTTP GET)
[英]Can't get IClientMessageFormatter to work
我有自定义IClientMessageFormatter,它当前在消息中添加了指定xml元素的属性:
public class GetOrdersMessageFormatter : IClientMessageFormatter
{
readonly IClientMessageFormatter original;
public GetOrdersMessageFormatter(IClientMessageFormatter actual)
{
original = actual;
}
public void AddArrayNamespace(XmlNode node)
{
if (node != null)
{
var attribute = node.OwnerDocument.CreateAttribute("test");
attribute.Value = "test";
node.Attributes.Append(attribute);
}
}
public object DeserializeReply(Message message, object[] parameters)
{
return original.DeserializeReply(message, parameters);
}
public Message SerializeRequest(MessageVersion messageVersion, object[] parameters)
{
Message newMessage = null;
var message = original.SerializeRequest(messageVersion, parameters);
if (message.Headers.Action == "urn:Mage_Api_Model_Server_HandlerAction")
{
var doc = new XmlDocument();
using (var reader = message.GetReaderAtBodyContents())
{
doc.Load(reader);
}
if (doc.DocumentElement != null)
{
switch (doc.DocumentElement.LocalName)
{
case "call":
AddArrayNamespace(doc.SelectSingleNode("//args"));
break;
}
}
using (var ms = new MemoryStream())
{
using (var xw = XmlWriter.Create(ms))
{
doc.Save(xw);
ms.Position = 0;
using (var xr = XmlReader.Create(ms))
{
newMessage = Message.CreateMessage(message.Version, null, xr);
newMessage.Headers.CopyHeadersFrom(message);
newMessage.Properties.CopyProperties(message.Properties);
}
}
}
}
return newMessage;
}
}
它给出了例外
System.ArgumentException:用于消息正文的XmlReader必须位于元素上。 参数名称:阅读器
服务器堆栈跟踪:位于System.ServiceModel的System.ServiceModel.Channels.BodyWriterMessage.OnWriteBodyContents(XmlDictionaryWriter writer)的System.ServiceModel.Channels.BodyWriter.WriteBodyContents(XmlDictionaryWriter writer)的System.ServiceModel.Channels.XmlReaderBodyWriter.OnWriteBodyContents(XmlDictionaryWriter writer)处系统中System.ServiceModel.Channels.Message.WriteMessage(XmlDictionaryWriter writer)的System.ServiceModel.Channels.BufferedMessageWriter.WriteMessage(消息消息,BufferManager bufferManager,Int32 initialOffset,Int32 maxSizeQuota)中的.Channels.Message.OnWriteMessage(XmlDictionaryWriter writer)。 ServiceModel.Channels.TextMessageEncoderFactory.TextMessageEncoder.WriteMessage(消息消息,System.ServiceModel.Channels.HttpOutput.SerializeBufferedMessage(消息消息),位于System.ServiceModel.Channels.HttpOutput.Send(TimeSpan超时)在System.ServiceModel.Channels.HttpChannelFa ctory.HttpRequestChannel.HttpChannelRequest.SendRequest(消息,TimeSpan超时)在System.ServiceModel.Channels.RequestChannel.Request(消息,TimeSpan超时)在System.ServiceModel.Dispatcher.RequestChannelBinder.Request(消息,TimeSpan超时)在系统.ServiceModel.Channels.ServiceChannel.Call(字符串操作,布尔型单向,ProxyOperationRuntime操作,System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall,ProxyOperationRuntime操作)在System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall,ProxyOperationRuntime operation) .ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
我以为,可能是我需要使用message.CreateBufferedCopy()创建消息副本,然后使用该副本加载XmlDocument,但是那也不起作用。 可能有人知道我在做错什么,或者知道例子,这在做几乎相同的事情(我的意思是在发送消息之前影响消息xml)。
格式化程序中的问题在于,您正在使用读取器(和流)创建一条消息,该消息在消息被消耗之前就被丢弃了。 从流和阅读器的创建中删除“ using”语句后,请求通过-请参见下面的代码。
public class StackOverflow_8669406
{
public class GetOrdersMessageFormatter : IClientMessageFormatter
{
readonly IClientMessageFormatter original;
public GetOrdersMessageFormatter(IClientMessageFormatter actual)
{
original = actual;
}
public void AddArrayNamespace(XmlNode node)
{
if (node != null)
{
var attribute = node.OwnerDocument.CreateAttribute("test");
attribute.Value = "test";
node.Attributes.Append(attribute);
}
}
public object DeserializeReply(Message message, object[] parameters)
{
return original.DeserializeReply(message, parameters);
}
public Message SerializeRequest(MessageVersion messageVersion, object[] parameters)
{
Message newMessage = null;
var message = original.SerializeRequest(messageVersion, parameters);
if (message.Headers.Action == "urn:Mage_Api_Model_Server_HandlerAction")
{
var doc = new XmlDocument();
using (var reader = message.GetReaderAtBodyContents())
{
doc.Load(reader);
}
if (doc.DocumentElement != null)
{
switch (doc.DocumentElement.LocalName)
{
case "call":
AddArrayNamespace(doc.SelectSingleNode("//args"));
break;
}
}
var ms = new MemoryStream();
XmlWriterSettings ws = new XmlWriterSettings
{
CloseOutput = false,
};
using (var xw = XmlWriter.Create(ms, ws))
{
doc.Save(xw);
xw.Flush();
}
Console.WriteLine(Encoding.UTF8.GetString(ms.ToArray()));
ms.Position = 0;
var xr = XmlReader.Create(ms);
newMessage = Message.CreateMessage(message.Version, null, xr);
newMessage.Headers.CopyHeadersFrom(message);
newMessage.Properties.CopyProperties(message.Properties);
}
return newMessage;
}
}
[ServiceContract(Namespace = "")]
public interface ITest
{
[OperationContract(Action = "urn:Mage_Api_Model_Server_HandlerAction")]
int call(string args);
}
public class Service : ITest
{
public int call(string args)
{
return int.Parse(args);
}
}
class MyBehavior : IOperationBehavior
{
public void AddBindingParameters(OperationDescription operationDescription, BindingParameterCollection bindingParameters)
{
}
public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation)
{
clientOperation.Formatter = new GetOrdersMessageFormatter(clientOperation.Formatter);
}
public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation)
{
}
public void Validate(OperationDescription operationDescription)
{
}
}
public static void Test()
{
string baseAddress = "http://" + Environment.MachineName + ":8000/Service";
ServiceHost host = new ServiceHost(typeof(Service), new Uri(baseAddress));
host.AddServiceEndpoint(typeof(ITest), new BasicHttpBinding(), "");
host.Open();
Console.WriteLine("Host opened");
ChannelFactory<ITest> factory = new ChannelFactory<ITest>(new BasicHttpBinding(), new EndpointAddress(baseAddress));
foreach (OperationDescription operation in factory.Endpoint.Contract.Operations)
{
operation.Behaviors.Add(new MyBehavior());
}
ITest proxy = factory.CreateChannel();
Console.WriteLine(proxy.call("4455"));
((IClientChannel)proxy).Close();
factory.Close();
Console.Write("Press ENTER to close the host");
Console.ReadLine();
host.Close();
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.