我有一个使用WCF响应MSMQ上的消息的服务。当消息格式正确时,它正常工作,我们很高兴。当消息用于不同的服务,并且操作不同时,消息保留在队列中,我们获取日志条目,我们修复,我们很高兴。
但是当消息具有正确的操作,但包含无法由服务器反序列化的XML元素时,消息将从队列中消失,我们不会获得日志条目,我们接下来不知道发生了什么。我们不高兴。
我尝试过添加IErrorHandler。我试过添加一个Faulted事件处理程序。我唯一能做的就是使用内置于WCF的诊断日志记录。有没有什么方法可以用代码,我自己的记录器或错误处理程序来响应这样的错误?
我的队列碰巧是交易性的,但这个问题似乎没什么区别。这发生在Windows Server 2003上的MSMQ 3.0版上。
此源代码显示问题:
class Program : IErrorHandler {
private static Uri QueueUri = new Uri("net.msmq://localhost/private/server_queue");
static void Main(string[] args) {
Program program = new Program();
if (args.Length > 0) {
if (args[0] == "server") {
program.Server();
} else if (args[0] == "bad") {
program.BadClient();
}
} else {
program.Client();
}
}
public void BadClient() {
using (var client = new BadServiceClient(QueueUri)) {
client.Do(new [] {new BadStuff { BadMessage = "hi" }});
}
}
public void Client() {
using (var client = new ServiceClient(QueueUri)) {
client.Do(new [] {new Stuff {Message = "hi"}});
}
}
public void Server() {
var serviceHost = new ServiceHost(typeof(Service));
serviceHost.AddServiceEndpoint(typeof (IService), new NetMsmqBinding(), QueueUri);
serviceHost.Open();
serviceHost.Faulted += serviceHost_Faulted;
serviceHost.UnknownMessageReceived += new EventHandler<UnknownMessageReceivedEventArgs>(serviceHost_UnknownMessageReceived);
foreach (ChannelDispatcher dispatcher in serviceHost.ChannelDispatchers) {
dispatcher.ErrorHandlers.Add(this);
}
Console.WriteLine("press the any key");
Console.ReadKey(true);
}
void serviceHost_UnknownMessageReceived(object sender, UnknownMessageReceivedEventArgs e) {
Console.WriteLine("unknown message: {0}", e);
}
private static void serviceHost_Faulted(object sender, EventArgs e) {
Console.WriteLine("fault: {0}", e);
}
public void ProvideFault(Exception error, MessageVersion version, ref Message fault) {
Console.WriteLine("handling error: {0}", error);
}
public bool HandleError(Exception error) {
Console.WriteLine("handling error: {0}", error);
return true;
}
}
[ServiceContract]
public interface IService {
[OperationContract(IsOneWay = true, Action = "do")]
void Do(IEnumerable<Stuff> stuffs);
}
[ServiceContract]
public interface IBadService {
[OperationContract(IsOneWay = true, Action = "do")]
void Do(IEnumerable<BadStuff> stuffs);
}
class ServiceClient : ClientBase<IService>, IService {
public ServiceClient(Uri uri) : base(new NetMsmqBinding(), new EndpointAddress(uri)) {}
public void Do(IEnumerable<Stuff> stuffs) {
Channel.Do(stuffs);
}
}
class BadServiceClient : ClientBase<IBadService>, IBadService {
public BadServiceClient(Uri uri) : base(new NetMsmqBinding(), new EndpointAddress(uri)) {}
public void Do(IEnumerable<BadStuff> stuffs) {
Channel.Do(stuffs);
}
}
[ServiceBehavior(TransactionTimeout = "00:5:00", InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Single)]
class Service : IService {
[OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)]
public void Do(IEnumerable<Stuff> stuffs) {
foreach (var stuff in stuffs) {
Console.WriteLine("service doing stuff, message: " + stuff.Message);
}
}
}
[DataContract]
public class Stuff {
[DataMember]
public string Message;
}
[DataContract]
public class BadStuff : Stuff {
[DataMember]
public string BadMessage;
}
答案 0 :(得分:0)
现在已经很晚了,但是对于像我这样可能有类似问题的其他人也可以给出答案。请注意,MSMQ的使用与无法提取格式错误的消息无关。 Tim提到使用IDispatchMessageInspector实现时,如果因为格式错误(例如包含&amp; char)而无法反序列化XML,则不会给出消息。
我唯一能找到的是打开常规WCF消息跟踪,其中logMalformedMessages在messageLogging元素下根据本文档设置为true(希望MS不移动链接):