C# Can';无法使IClientMessageFormatter正常工作
我有一个自定义IClientMessageFormatter,它当前向消息中指定的xml元素添加属性:C# Can';无法使IClientMessageFormatter正常工作,c#,wcf,C#,Wcf,我有一个自定义IClientMessageFormatter,它当前向消息中指定的xml元素添加属性: public class GetOrdersMessageFormatter : IClientMessageFormatter { readonly IClientMessageFormatter original; public GetOrdersMessageFormatter(IClientMessageFormatter actual) {
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;
}
}
这是个例外
System.ArgumentException:用于消息正文的XmlReader必须位于元素上。
参数名称:reader
服务器堆栈跟踪:
位于System.ServiceModel.Channel.XmlReaderBodyWriter.OnWriteBodyContents(XmlDictionaryWriter编写器)
位于System.ServiceModel.Channel.BodyWriter.WriteByContents(XmlDictionaryWriter编写器)
位于System.ServiceModel.Channel.BodyWriterMessage.OnWriteByContents(XmlDictionaryWriter编写器)
位于System.ServiceModel.Channel.Message.OnWriteMessage(XmlDictionaryWriter编写器)
位于System.ServiceModel.Channel.Message.WriteMessage(XmlDictionaryWriter编写器)
位于System.ServiceModel.Channels.BufferedMessageWriter.WriteMessage(消息消息,BufferManager BufferManager,Int32 initialOffset,Int32 maxSizeQuota)
位于System.ServiceModel.Channels.TextMessageEncoderFactory.TextMessageEncoder.WriteMessage(消息消息,Int32 maxMessageSize,BufferManager BufferManager,Int32 messageOffset)
在System.ServiceModel.Channels.HttpOutput.SerializedBufferedMessage(消息消息)处
位于System.ServiceModel.Channels.HttpOutput.Send(TimeSpan超时)
位于System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.SendRequest(消息消息,TimeSpan超时)
位于System.ServiceModel.Channels.RequestChannel.Request(消息消息,TimeSpan超时)
位于System.ServiceModel.Dispatcher.RequestChannelBinder.Request(消息消息,TimeSpan超时)
在System.ServiceModel.Channels.ServiceChannel.Call(字符串操作、布尔单向、ProxyOperationRuntime操作、对象[]输入、对象[]输出、时间跨度超时)
位于System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage方法调用,ProxyOperationRuntime操作)
位于System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage消息)
我想,这可能是我需要使用message.CreateBufferedCopy()创建消息副本,并使用该副本加载XmlDocument,但这也不起作用。
可能有人知道我做错了什么,或者知道这个例子,它正在做几乎相同的事情(我的意思是在发送消息xml之前影响它)。格式化程序中的问题是,您正在创建一个带有读卡器(和流)的消息,而读卡器(和流)在消息被消费之前被处理。在从流和读取器的创建中删除“using”语句之后,请求将通过—请参阅下面的代码
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();
}
}
公共类StackOverflow_8669406
{
公共类GetOrdersMessageFormatter:IClientMessageFormatter
{
只读IClientMessageFormatter原件;
公共GetOrdersMessageFormatter(IClientMessageFormatter实际)
{
原始=实际;
}
public void AddArrayNamespace(XmlNode节点)
{
如果(节点!=null)
{
var attribute=node.OwnerDocument.CreateAttribute(“测试”);
attribute.Value=“测试”;
node.Attributes.Append(属性);
}
}
公共对象反序列化reply(消息,对象[]参数)
{
返回original.DeserializeReply(消息、参数);
}
公共消息序列化请求(MessageVersion MessageVersion,对象[]参数)
{
消息newMessage=null;
var message=original.SerializeRequest(messageVersion,参数);
if(message.Headers.Action==“urn:Mage\u Api\u Model\u Server\u HandlerAction”)
{
var doc=新的XmlDocument();
使用(var reader=message.GetReaderAtBodyContents())
{
文件加载(读卡器);
}
如果(doc.DocumentElement!=null)
{
开关(doc.DocumentElement.LocalName)
{
案例“呼叫”:
AddArrayNamespace(doc.SelectSingleNode(//args));
打破
}
}
var ms=新内存流();
XmlWriterSettings ws=新的XmlWriterSettings
{
CloseOutput=false,
};
使用(var xw=XmlWriter.Create(ms,ws))
{
单据保存(xw);
xw.Flush();
}
Console.WriteLine(Encoding.UTF8.GetString(ms.ToArray());
ms.Position=0;
var xr=XmlReader.Create(毫秒);
newMessage=Message.CreateMessage(Message.Version,null,xr);
newMessage.Headers.CopyHeadersFrom(消息);
newMessage.Properties.CopyProperties(message.Properties);
}
返回新消息;
}
}
[ServiceContract(名称空间=”)]
公共接口测试
{
[操作合同(Action=“urn:Mage\u Api\u Model\u Server\u HandlerAction”)]
int调用(字符串参数);
}
公共类服务:ITest
{
公共int调用(字符串参数)
{
返回int.Parse(args);
}
}
类MyBehavior:IOperationBehavior
{
public void AddBindingParameters(OperationDescription OperationDescription,BindingParameterCollection bindingParameters)
{
}
public void ApplyClientBehavior(操作说明操作说明,客户端操作客户端操作)
{
clientOperation.Formatter=新的GetOrdersMessageFormatter(clientOperation.Formatter);
}
public void ApplyDispatchBehavior(操作说明操作说明,调度操作调度操作)
{
}
公共无效验证(OperationDescription OperationDescription)
{
}