我正在创建一个自我主持的WCF Service
。
[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]
public interface IStateChecker
{
[OperationContract]
void SetState(string state);
}
这是我的Service
:
public class StateCheckerService : IStateChecker
{
public void SetState(string state)
{
Console.WriteLine($"{DateTime.Now.ToString("dd.MM.yyyy HH:mm:sss")} : {state}");
}
}
这是我的实现:
//Define baseaddres:
Uri baseAddress = new Uri("http://localhost:8000/ServiceModelSamples/Service");
//create host:
ServiceHost selfHost = new ServiceHost(typeof(StateCheckerService), baseAddress);
try
{
//Add endpoint to host:
selfHost.AddServiceEndpoint(typeof(IStateChecker), new WSHttpBinding(), "StateCheckerService");
//Add metadata exchange:
ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
smb.HttpGetEnabled = true;
selfHost.Description.Behaviors.Add(smb);
selfHost.Faulted += SelfHost_Faulted;
//Start service
selfHost.Open();
Console.WriteLine("Starting Service...");
if (selfHost.State == CommunicationState.Opened)
{
Console.WriteLine("The service is ready.");
}
Console.WriteLine("Press <ENTER> to terminate service.");
Console.ReadLine();
//Shutdown service
selfHost.Close();
}
catch (CommunicationException ce)
{
Console.WriteLine("An exception occurred: {0}", ce.Message);
selfHost.Abort();
}
private static void SelfHost_Faulted(object sender, EventArgs e)
{
ServiceHost host = sender as ServiceHost;
Console.WriteLine(host?.State);
Console.WriteLine(e?.ToString());
host?.Open();
}
现在,当涉及客户端时,我会出现错误。
try
{
//Works using the ServiceReference (wsdl ... created by VisualStudio):
using (StateCheckerServiceReference.StateCheckerClient client = new StateCheckerClient())
{
client.SetState("Test");
}
//Does not work:
EndpointAddress endpointAddress = new EndpointAddress("http://localhost:8000/ServiceModelSamples/Service");
using (ChannelFactory<IStateCheckerChannel> factory = new ChannelFactory<IStateCheckerChannel>("WSHttpBinding_IStateChecker", endpointAddress))
{
using (IStateCheckerChannel channel = factory.CreateChannel(endpointAddress))
{
channel?.SetState("Test");
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
例外:
The communication object, "System.ServiceModel.Channels.ServiceChannel",
cannot be used for communication because it is in the Faulted state.
我从不输入
SelfHost_Faulted
,我的服务上也没有任何Exception
s
我这样做是因为我想更改客户端应在运行时连接的Endpoint
。
如果我做错了,请告诉我。否则,对我的代码有问题的任何提示将受到高度赞赏。
这个问题非常微不足道,但被WCF基础架构隐藏(奇怪的是标准模式的实现)。
如果您更改
channel?.SetState("Test");
to
try
{
channel?.SetState("Test");
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
您会看到2条消息:
在http://localhost:8000/serviceModelSamples/服务中没有端点侦听。这通常是由不正确的地址或肥皂作用引起的。有关更多详细信息,请参见Innerexception(如果存在)。
和
通信对象,System.ServiceModel.Channels.ServiceChannel,不能用于通信,因为它处于故障状态。
第一个是真正的例外(类型EndpointNotFoundException
),由内部catch
捕获。
第二个(误导)例外是类型CommunicationObjectFaultedException
,并由channel.Dispose()
(?!)在using
块的末端拨打,因此隐藏了原始的块。WCF实施根本不遵循Dispose()
不应该投掷的规则!
"baseAddress/StateCheckerService"
,而目前仅是"baseAddress"
。因此,只需使用正确的端点地址
var endpointAddress = new EndpointAddress(
"http://localhost:8000/ServiceModelSamples/Service/StateCheckerService");
将解决问题。