C# 需要提供一种以编程方式连接到多个SOAP端点的方法

给定：
具有

Service.asmx

页面的多个客户端，其中包含一些我需要连接的web方法

一种实用函数，它接受输入以确定需要连接到哪个客户端。这就是我到目前为止所做的：

public static MyServiceSoapClient SoapClientFactory(string clientCode)
{
    var binding = new WSHttpBinding(SecurityMode.Message, false);
    var remoteAddress = new EndpointAddress(
        new Uri(string.Format("http://{0}.mydomain.com/Service.asmx", clientCode)),
        new UpnEndpointIdentity("myservice@domain.com"));

    return new MyServiceSoapClient(binding, remoteAddress);
}

此方法完成时没有任何错误（注意：我不知道EndPointIdentity是什么，所以我只是想出了一个字符串放在那里…不确定这是否应该在其他地方的配置设置中，或者是什么？）

问题：
尝试调用远程方法时，会引发异常，并且异常的描述性不强（A

NullReferenceException

）。代码如下：

// point to the correct Service.asmx url.
var client = Util.SoapClientFactory(clientCode);

// now make the soap call.
var result = client.GetSomeStuff(someParameter); // throws the exception.

堆栈跟踪：

System.NullReferenceException: Object reference not set to an instance of an object.
    Server stack trace:
    at System.ServiceModel.Security.IssuanceTokenProviderBase`1.DoNegotiation(TimeSpan timeout)
    at System.ServiceModel.Security.SspiNegotiationTokenProvider.OnOpen(TimeSpan timeout)
    at System.ServiceModel.Security.WrapperSecurityCommunicationObject.OnOpen(TimeSpan timeout)
    at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
    at System.ServiceModel.Security.CommunicationObjectSecurityTokenProvider.Open(TimeSpan timeout)
    at System.ServiceModel.Security.SecurityUtils.OpenTokenProviderIfRequired(SecurityTokenProvider tokenProvider, TimeSpan timeout)
    at System.ServiceModel.Security.SymmetricSecurityProtocol.OnOpen(TimeSpan timeout)
    at System.ServiceModel.Security.WrapperSecurityCommunicationObject.OnOpen(TimeSpan timeout)
    at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
    at System.ServiceModel.Channels.SecurityChannelFactory`1.ClientSecurityChannel`1.OnOpen(TimeSpan timeout)
    at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
    at System.ServiceModel.Security.SecuritySessionSecurityTokenProvider.DoOperation(SecuritySessionOperation operation, EndpointAddress target, Uri via, SecurityToken currentToken, TimeSpan timeout)
    at System.ServiceModel.Security.SecuritySessionSecurityTokenProvider.GetTokenCore(TimeSpan timeout)
    at System.IdentityModel.Selectors.SecurityTokenProvider.GetToken(TimeSpan timeout)
    at System.ServiceModel.Security.SecuritySessionClientSettings`1.ClientSecuritySessionChannel.OnOpen(TimeSpan timeout)
    at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
    at System.ServiceModel.Channels.ServiceChannel.OnOpen(TimeSpan timeout)
    at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
    at System.ServiceModel.Channels.ServiceChannel.CallOpenOnce.System.ServiceModel.Channels.ServiceChannel.ICallOnce.Call(ServiceChannel channel, TimeSpan timeout)
    at System.ServiceModel.Channels.ServiceChannel.CallOnceManager.CallOnce(TimeSpan timeout, CallOnceManager cascade)
    at System.ServiceModel.Channels.ServiceChannel.EnsureOpened(TimeSpan timeout)
    at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
    at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)
    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 ... my function call. (i.e. client.GetSomeStuff(someParameter) )

---

我找到了问题的答案。我要做的是使用默认构造函数创建一个Soap客户机（这总是有效的，但是我在开发过程中使用了我配置的Uri），然后我要做的是设置

端点
地址
属性，它工作得很好

var client = new MySoapClient();

// this can also be set using Web.config parameter now or a value stored in a database etc.
client.Endpoint.Address = new EndpointAddress("http://localhost:3000/Service.asmx");
return client;

这是
ex.ToString（）
的全部结果吗？没有
内部异常
？此外，所有客户端都会发生这种情况吗？@John Saunders这是
ex.ToString（）
的全部结果。另外，
ex.innerExction
为
null
。如果在工厂简化代码，会发生什么？如果你使用一个静态的，已知的好的URL呢？如果通过配置名称使用已配置的绑定，而不是创建一个绑定，该怎么办？这将有助于缩小问题的范围。当然，这显然是WCF中的一个bug-无论它未能取消引用什么对象，它都应该首先检查它，并且您应该收到一个
ArgumentNullException
。John，我现在已经解决了这个问题。谢谢你的帮助。