连接到WebService时的SystemNullReference

我已经通过Visual Studio 2015创建了服务引用。通信工作正常，但我必须从app.config文件中获取应用程序。我试图创建自己的绑定和端点，但实际上我收到SystemNullReference。连接到WebService时的SystemNullReference

样品我的代码：

var binding = CreateBinding(); 
    var endpoint = new EndpointAddress("http://ws.cdyne.com/emailverify/Emailvernotestemail.asmx"); 
    var Client = new Testowy.Emailver.EmailVerNoTestEmailSoapClient(binding, endpoint); 

private static BasicHttpBinding CreateBinding() 
     { 
      var binding = new BasicHttpBinding(); 
      binding.Name = "EmailVerNoTestEmailSoap"; 
      binding.CloseTimeout = TimeSpan.FromMinutes(1); 
      binding.OpenTimeout = TimeSpan.FromMinutes(1); 
      binding.ReceiveTimeout = TimeSpan.FromMinutes(10); 
      binding.SendTimeout = TimeSpan.FromMinutes(1); 
      binding.AllowCookies = false; 
      binding.BypassProxyOnLocal = false; 
      binding.HostNameComparisonMode = HostNameComparisonMode.StrongWildcard; 
      binding.MaxBufferSize = 65536; 
      binding.MaxBufferPoolSize = 524288; 
      binding.MessageEncoding = WSMessageEncoding.Text; 
      binding.TextEncoding = System.Text.Encoding.UTF8; 
      binding.TransferMode = TransferMode.Buffered; 
      binding.UseDefaultWebProxy = true; 

      binding.ReaderQuotas.MaxDepth = 32; 
      binding.ReaderQuotas.MaxStringContentLength = 8192; 
      binding.ReaderQuotas.MaxArrayLength = 16384; 
      binding.ReaderQuotas.MaxBytesPerRead = 4096; 
      binding.ReaderQuotas.MaxNameTableCharCount = 16384; 

      binding.Security.Mode = BasicHttpSecurityMode.None; 
      binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None; 
      binding.Security.Transport.ProxyCredentialType = HttpProxyCredentialType.None; 
      binding.Security.Transport.Realm = ""; 
      binding.Security.Message.ClientCredentialType = BasicHttpMessageCredentialType.UserName; 
      binding.Security.Message.AlgorithmSuite = System.ServiceModel.Security.SecurityAlgorithmSuite.Default; 
      return binding; 
     }

System.NullReferenceException：对象不设置到对象的实例。

服务器堆栈跟踪：W System.ServiceModel.Security.IssuanceTokenProviderBase 1.DoNegotiation(TimeSpan timeout) w System.ServiceModel.Security.SspiNegotiationTokenProvider.OnOpen(TimeSpan timeout) w System.ServiceModel.Security.WrapperSecurityCommunicationObject.OnOpen(TimeSpan timeout) w System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) w System.ServiceModel.Security.CommunicationObjectSecurityTokenProvider.Open(TimeSpan timeout) w System.ServiceModel.Security.SymmetricSecurityProtocol.OnOpen(TimeSpan timeout) w System.ServiceModel.Security.WrapperSecurityCommunicationObject.OnOpen(TimeSpan timeout) w System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) w System.ServiceModel.Channels.SecurityChannelFactory 1.ClientSecurityChannel 1.OnOpen(TimeSpan timeout) w System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) w System.ServiceModel.Security.SecuritySessionSecurityTokenProvider.DoOperation(SecuritySessionOperation operation, EndpointAddress target, Uri via, SecurityToken currentToken, TimeSpan timeout) w System.ServiceModel.Security.SecuritySessionSecurityTokenProvider.GetTokenCore(TimeSpan timeout) w System.IdentityModel.Selectors.SecurityTokenProvider.GetToken(TimeSpan timeout) w System.ServiceModel.Security.SecuritySessionClientSettings 1.ClientSecuritySessionChannel.OnOpen（时间跨度超时）w System.ServiceModel.Channels.CommunicationObject.Open（时间跨度超时）w System.ServiceModel.Channels.ServiceChannel.OnOpen（时间跨度超时）
W¯¯System.ServiceModel.Channels.CommunicationObject.Open（时间跨度超时）w System.ServiceModel.Channels.ServiceChannel.CallOpenOnce.System.ServiceModel.Channels.ServiceChannel。 ICallOnce.Call（ServiceChannel 信道，时间跨度超时）瓦特 System.ServiceModel.Channels.ServiceChannel.CallOnceManager.CallOnce（时间跨度超时，CallOnceManager级联）瓦特 System.ServiceModel.Channels.ServiceChannel.EnsureOpened（时间跨度超时）瓦特System.ServiceModel.Channels。 ServiceChannel.Call（字符串动作，布尔单向，ProxyOperationRuntime操作，对象[]插件，对象[]奏，时间跨度超时）瓦特 System.ServiceModel.Channels.ServiceChannelProxy.InvokeService（IMethodCallMessage 包括methodCall，ProxyOperationRuntime操作）瓦特系统.ServiceModel.Channels.ServiceChannelProxy.Invoke（IMessage message）
在210
异常重新抛出[0]：瓦特 System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage（即时聊天 reqMsg，即时聊天retMsg）瓦特 System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke（MessageData & MSGDATA，的Int32型）瓦特 WebServices.Testowy.Emailver.EmailVerNoTestEmailSoap.AdvancedVerifyEmail（字符串电子邮件，的Int32超时，字符串LICENSEKEY）瓦特 WebServices.Test.GetWebService（）瓦特 C：\用户\ michal.warchulinski \源\回购\ Aplixcom_CommonComponents \ Aplixcom_CommonComponents \ WebServices \ ClientClasses.cs：wiersz 65 w App.Main（）w C：\ Users \ michal.warchulinski \ Documents \ Visual Studio 2015 \ Projects \ Soap \ Soap \ Program.cs：wiers z 22

对不起很多文字。任何线索可以提供这种豁免？

来源

2017-03-29 warkocz

你把调试器，看看它不喜欢哪个位？你看过哪一行完全抛出异常吗？ –

您是否在调用webservice方法之前调用Client.Open（）？ –

@ChrisWatts调用此方法的代码位于另一个解决方案中。这似乎是异常抛出 “var Client = new Testowy.Emailver.EmailVerNoTestEmailSoapClient（binding，endpoint）;”但正如我刚才查看的那样，当项目处于相同的解决方案时，一切正常。 – warkocz

尝试在调用webservice方法之前调用客户端上的Open方法。有时它有助于解决一些对象初始化问题。

我们可以根据您的堆栈跟踪来看到它实际上在您调用webservice方法时试图打开客户端。但显然它试图以与Open方法不同的方式打开频道。

不幸的是，我没有足够的知识来解释为什么Open调用有时需要，有时候不需要。

如果有人能解释这一点，我很高兴。

来源

2017-03-29 18:49:49

连接到WebService时的SystemNullReference

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