Question

假设：
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。

一个实用程序函数，它接受输入以确定需要连接哪个客户端。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);
}

这个方法完成没有错误（注意：我不知道EndPointIdentity是什么，所以我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或什么？）

问题：
在尝试调用远程方法时，会抛出异常并且它不具有描述性（A NullReferenceException）。这是代码：

// 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) )

Answer 1

我找到了问题的答案。我所做的是使用默认构造函数创建一个Soap客户端（这总是有效，但后来我在开发期间配置了Uri）我所做的就是设置Endpoint的{{1}它的功能就像一个魅力！

Address

需要提供一种以编程方式连接到多个SOAP端点的方法

1 个答案: