Question

我有一个简单的自主WCF服务。我在远程服务器上运行此服务。我可以与在我的机器上运行的客户端进行通信（我是本地管理员）。但是当我在不同的机器上运行相同的客户端（非管理员）时，他们无法进行通信。

我监控资源管理器，我发现每次服务呼叫和回叫时都有两个随机本地端口正在打开。所以我无法打开特定的端口。

任何想法可能是其他机器上的可能原因或防火墙配置更改？

我对WCF很新。如果这是一个基本问题，请原谅我。

WCF服务器代码

namespace CService
    {
    class Program
       {
       static void Main(string[] args) {

        Console.Title = "C Service";

        // Step 1 of the address configuration procedure: Create a URI to serve as the base address.
        Uri baseAddress = new Uri("http://" + GetServerIPPort.ServerIP + ":" + GetServerIPPort.Port + "/CService/Service");


        // Step 2 of the hosting procedure: Create ServiceHost
        ServiceHost selfHost = new ServiceHost(typeof(CSerice), baseAddress);

        try
        {
            // Step 3 of the hosting procedure: Add a service endpoint.
            selfHost.AddServiceEndpoint(typeof(ICService), new BasicHttpBinding(), "CService");

            // Step 4 of the hosting procedure: Enable metadata exchange.
            ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
            smb.HttpGetEnabled = true;
            selfHost.Description.Behaviors.Add(smb);

            // Step 5 of the hosting procedure: Start (and then stop) the service.
            selfHost.Open();
            Console.WriteLine("The Coemet Service is ready and its listening on {0}", baseAddress.AbsoluteUri.ToString() + ":" + baseAddress.Port.ToString());

            Console.WriteLine("Press <ENTER> to terminate service.");
            Console.WriteLine();
            Console.ReadLine();

            // Close the ServiceHostBase to shutdown the service.
            selfHost.Close();
        }
        catch (CommunicationException ce)
        {
            Console.WriteLine("An exception occurred: {0}", ce.ToString());
            selfHost.Abort();
        }
    }
}

我在此链接http://msdn.microsoft.com/en-us/library/ms733133(v=vs.110).aspx

的帮助下生成了代理对象

我的客户端代码段看起来像这样。

string serviceEndPointAddress = "http://" + GetServerIPPort.ServerIP + ":" +     GetServerIPPort.Port + "/CService/Service/CService";

            var remoteAddress = new System.ServiceModel.EndpointAddress(new Uri(serviceEndPointAddress));
            object rawOutput;
            using (var client = new CServiceClient(new BasicHttpBinding(), remoteAddress))
            {
                client.Endpoint.Binding.SendTimeout = new TimeSpan(0, 0, 0, 100);
                try
                {
                    rawOutput = client.GetData(Identifier, field, date);
                }
                catch (Exception e)
                {
                    errorMsg = e.ToString();
                }
            }\n

在“client.GetData（标识符，字段，日期）”

时出现错误

System.Runtime.Serialization.InvalidDataContractException：输入'System.Threading.Tasks.Task 1[System.Object]' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. If the type is a collection, consider marking it with the CollectionDataContractAttribute. See the Microsoft .NET Framework documentation for other supported types. at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.ThrowInvalidDataContractException(String message, Type type) at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.CreateDataContract(Int32 id, RuntimeTypeHandle typeHandle, Type type) at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.GetDataContractSkipValidation(Int32 id, RuntimeTypeHandle typeHandle, Type type) at System.Runtime.Serialization.XsdDataContractExporter.GetSchemaTypeName(Type type) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.CreatePartInfo(MessagePartDescription part, OperationFormatStyle style, DataContractSerializerOperationBehavior serializerFactory) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.CreateMessageInfo(DataContractFormatAttribute dataContractFormatAttribute, MessageDescription messageDescription, DataContractSerializerOperationBehavior serializerFactory) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter..ctor(OperationDescription description, DataContractFormatAttribute dataContractFormatAttribute, DataContractSerializerOperationBehavior serializerFactory) at System.ServiceModel.Description.DataContractSerializerOperationBehavior.GetFormatter(OperationDescription operation, Boolean& formatRequest, Boolean& formatReply, Boolean isProxy) at System.ServiceModel.Description.DataContractSerializerOperationBehavior.System.ServiceModel.Description.IOperationBehavior.ApplyClientBehavior(OperationDescription description, ClientOperation proxy) at System.ServiceModel.Description.DispatcherBuilder.BindOperations(ContractDescription contract, ClientRuntime proxy, DispatchRuntime dispatch) at System.ServiceModel.Description.DispatcherBuilder.BuildProxyBehavior(ServiceEndpoint serviceEndpoint, BindingParameterCollection& parameters) at System.ServiceModel.Channels.ServiceChannelFactory.BuildChannelFactory(ServiceEndpoint serviceEndpoint, Boolean useActiveAutoClose) at System.ServiceModel.ChannelFactory.CreateFactory() at System.ServiceModel.ChannelFactory.OnOpening() at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) at System.ServiceModel.ChannelFactory.EnsureOpened() at System.ServiceModel.ChannelFactory 1.CreateChannel（EndpointAddress address，Uri via）在System.ServiceModel.ClientBase 1.CreateChannel() at System.ServiceModel.ClientBase 1.CreateChannelInternal（）在System.ServiceModel.ClientBase`1.get_Channel（） at CServiceClient.GetData（String Identifier，String field，DateTime date）

Answer 1

在.NET 4.5中，对WCF中基于任务的异步操作有了新的支持。使用VS 2012或更高版本在开发计算机上生成代理时 - 默认情况下可以包含这些代理。

现在你正在使用的新机器可能在.NET 4.0上运行，因此不知道基于任务的异步操作有什么用处 - 因此是例外。

这是一个非常简单的修复，为了支持运行.NET 4.0的客户端，您只需要在服务参考设置中执行以下任一操作：

取消选中允许生成异步操作
选择生成异步操作，而不是生成基于任务的操作

特别感谢blog post。

Answer 2

根据异常，您传递的是不可序列化的对象。我怀疑这是以下代码行中的标识符：

rawOutput = client.GetData(Identifier, field, date);

根据堆栈跟踪，CService期望两个字符串和一个日期时间：

System.ServiceModel.ClientBase`1.get_Channel（）at CServiceClient.GetData（String Identifier，String field，DateTime date）

如果需要使用WCF传递自定义对象（数据传输对象），则应使用类的DataContractAttribute属性和每个成员的DataMemberAttribute，如下所示：

[DataContract]
public class Identifier
{
    [DataMember]
    public string Id {get;set;}
}

Answer 3

我也面临着同样的问题，当我在更高版本的框架4.5上创建WCF服务并尝试在IIS 8（即应用程序池4.0）上进行部署时，上述步骤未能解决我的问题，因此我重新创建了我在框架4.0中从零开始的完整解决方案，然后重新部署了它。使用服务时，按照上述步骤取消选中“允许异步操作生成”即可解决我的问题。

WCF客户端无法在某些计算机上连接

3 个答案: