C# 为什么WCF和ASP.NET web应用程序中的连接意外关闭？

这是我在Asp.net web应用程序中使用的代码。它正在使用一个WCF服务，其中有一个函数receiveMsg（）

receiveMsg（）看起来像-

public ArrayList receiveMsg(String receiverId)
        {
            XDocument xdoc = XDocument.Load(@"C:\Users\abhinav\documents\visual studio 2010\Projects\WcfService1\WcfService1\Messages.xml");
            //XDocument xdoc = XDocument.Load(@"~/App_Data/Messages.xml");
            ArrayList messages = new ArrayList();

            var elements = from item in xdoc.Descendants("Messages").Descendants("Message")
                           where item.Element("ReceiverId").Value == receiverId
                           select new{ msgtxt = item.Element("MessageText").Value, sendid = item.Element("SenderId").Value };
            foreach (var element in elements)
            {
                Message msg = new Message();
                msg.sender_Id = element.sendid;
                msg.message = element.msgtxt;
                messages.Add(msg);
            }
            return messages;
        }

我做错了什么？是Linq还是WCF设置等

编辑-

这是我在IService.cs中添加的-

[DataContract]
    public class Message
    {
        [DataMember]
        public String sender_Id{get; set;}
        [DataMember]
        public String message { get; set; }
    }

所以我想做的就是-

XML文件包含大量消息。我想检索与接收方Id对应的所有邮件和发件人Id。为此，我创建了一个邮件类，其中发件人Id和邮件为成员。我想创建一个消息类对象的数组列表，并将其返回给客户端

堆栈跟踪-

Communication ExceptionSystem.ServiceModel.CommunicationException: The underlying connection was closed: The connection was closed unexpectedly. ---> System.Net.WebException: The underlying connection was closed: The connection was closed unexpectedly.
   at System.Net.HttpWebRequest.GetResponse()
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   --- End of inner exception stack trace ---

Server stack trace: 
   at System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason)
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at wcf_web_app.ServiceReference1.IService1.receiveMsg(String receiverId)
   at wcf_web_app.ServiceReference1.Service1Client.receiveMsg(String receiverId) in C:\Users\abhinav\documents\visual studio 2010\Projects\wcf_web_app\wcf_web_app\Service References\ServiceReference1\Reference.cs:line 136
   at wcf_web_app._Default.Button2_Click(Object sender, EventArgs e) in C:\Users\abhinav\documents\visual studio 2010\Projects\wcf_web_app\wcf_web_app\Default.aspx.cs:line 43

---

我觉得在生成消息类对象的ArrayList并返回它时存在一些问题。有什么问题吗？

首先在代码中添加一些基本的错误处理，看看能找到什么。事实上，我知道问题所在，问题就在我上面提到的那一行。对象是从WCF返回的，但没有被强制转换到ArrayList，我不知道该怎么办。如果receiveMsg的结果已经是ArrayList，为什么要将其强制转换到ArrayList？所以这不是问题所在。问题可能是结果是一个空列表（因为我假设您没有得到异常）。错误不在行中，而是在receiveMsg中。也许receiverId不会导致匹配（区分大小写？）。作为旁注，您不应该将结果保存到磁盘，然后再次加载。在控制台的wcf中，我已经记录了结果，并且receiveMsg工作正常，它会提供所需的输出。如果receiveMsg工作正常，那么问题出在哪里？它已经是一个ArrayList，所以这不成问题。如果你得到了一个例外，那么把它添加到问题中。此外，如果ReceiveMsg不相关，则将其删除，标题与问题有何关系？请阅读：

[DataContract]
    public class Message
    {
        [DataMember]
        public String sender_Id{get; set;}
        [DataMember]
        public String message { get; set; }
    }

Communication ExceptionSystem.ServiceModel.CommunicationException: The underlying connection was closed: The connection was closed unexpectedly. ---> System.Net.WebException: The underlying connection was closed: The connection was closed unexpectedly.
   at System.Net.HttpWebRequest.GetResponse()
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   --- End of inner exception stack trace ---

Server stack trace: 
   at System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason)
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at wcf_web_app.ServiceReference1.IService1.receiveMsg(String receiverId)
   at wcf_web_app.ServiceReference1.Service1Client.receiveMsg(String receiverId) in C:\Users\abhinav\documents\visual studio 2010\Projects\wcf_web_app\wcf_web_app\Service References\ServiceReference1\Reference.cs:line 136
   at wcf_web_app._Default.Button2_Click(Object sender, EventArgs e) in C:\Users\abhinav\documents\visual studio 2010\Projects\wcf_web_app\wcf_web_app\Default.aspx.cs:line 43