PROИТ: Ошибка "Attribute contract is required on element endpoint" в приложении ASP.Net

Проблема: при попытке из программного кода ASP.Net обратиться с запросом к веб-сервису (asmx) возникает ошибка:

Server Error in '/' Application.

Attribute 'contract' is required on element 'endpoint'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Configuration.ConfigurationErrorsException: Attribute 'contract' is required on element 'endpoint'.

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

<%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<system.web>

</system.web>

</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

Stack Trace:

[ConfigurationErrorsException: Attribute 'contract' is required on element
  'endpoint'.]

  System.Configuration.BaseConfigurationRecord.EvaluateOne(String[]
  keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord,
  SectionRecord sectionRecord, Object parentResult) +812598

  System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord
  factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean
  getLkg, Boolean getRuntimeObject, Object& result, Object&
  resultRuntimeObject) +814360

  System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String
  configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject,
  Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
  +826826

  System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String
  configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject,
  Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
  +826826

   System.Configuration.BaseConfigurationRecord.GetSection(String
  configKey) +69

  System.Configuration.ConfigurationManager.GetSection(String
  sectionName) +140

   System.ServiceModel.Activation.AspNetEnvironment.
UnsafeGetSectionFromConfigurationManager(String
  sectionPath) +42

  System.ServiceModel.Configuration.ConfigurationHelpers.
UnsafeGetAssociatedSection(ContextInformation
  evalContext, String sectionPath) +40

  System.ServiceModel.Description.ConfigLoader.LookupChannel(ContextInformation
  configurationContext, String configurationName, ContractDescription contract,
  EndpointAddress address, Boolean wildcard, Boolean useChannelElementKind,
  ServiceEndpoint& serviceEndpoint) +141

  System.ServiceModel.ChannelFactory.InitializeEndpoint(String
  configurationName, EndpointAddress address) +133

  System.ServiceModel.ChannelFactory`1..ctor(String
  endpointConfigurationName, EndpointAddress remoteAddress) +409

  System.ServiceModel.ConfigurationEndpointTrait`1.CreateSimplexFactory()
  +16661296

  System.ServiceModel.ClientBase`1.CreateChannelFactoryRef(EndpointTrait`1
  endpointTrait) +27

  System.ServiceModel.ClientBase`1.InitializeChannelFactoryRef()
  +546

   Account_Login.ViewQueryLogin()
  +924

  System.Web.UI.Control.LoadRecursive() +71

   System.Web.UI.Page.ProcessRequestMain(Boolean
  includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  +12308266

  System.Web.UI.Page.ProcessRequest(Boolean
  includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  +12307881

  System.Web.UI.Page.ProcessRequest() +119

  System.Web.UI.Page.ProcessRequest(HttpContext context) +99

  System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.

IExecutionStep.Execute()
  +913

  System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
  Boolean& completedSynchronously) +165

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34212

Данная ошибка означает, что в файле web.config неверно задана ветка для обращения к веб-сервису <system.serviceModel><client><endpoint>. Откройте конфигурационный файл и проверьте, какие параметры заданы в указанной ветке. Пример:

<system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="AuthServiceSoap" closeTimeout="00:01:00" 
        openTimeout="00:01:00" receiveTimeout="00:10:00" 
        sendTimeout="00:01:00" allowCookies="false" 
        bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
         maxBufferSize="65536" maxBufferPoolSize="524288" 
         maxReceivedMessageSize="65536" messageEncoding="Text" 
         textEncoding="utf-8" transferMode="Buffered" 
         useDefaultWebProxy="true">
          <readerQuotas maxDepth="32" maxStringContentLength="8192" 
          maxArrayLength="16384" maxBytesPerRead="4096" 
          maxNameTableCharCount="16384" />
          <security mode="Transport">
            <transport clientCredentialType="None" 
            proxyCredentialType="None" realm="" />
            <message clientCredentialType="UserName" 
            algorithmSuite="Default" />
          </security>
        </binding>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint 
      address="https://192.168.0.55:83/auth1/Services/AuthService.asmx" 
      binding="basicHttpBinding" bindingConfiguration="AuthServiceSoap" 
      contract="SSOAuthService.AuthServiceSoap" name="AuthServiceSoap" />
    </client>
  </system.serviceModel>

Обратите внимание на параметр "contract". Если возникает подобная ошибка, то данного параметра либо нет, либо он указан неверно. Он должен содержать название "контракта" по которому приложение будет взаимодействовать с указанным веб-сервисом. В коде самого приложения должен быть реализован данный тип контракта, например, в стандартной ASP-папке App_WebReferences (в виде файлов svcmap, disco, wsdl, svcinfo):

(с) Ella S.

PROИТ

Ошибка "Attribute contract is required on element endpoint" в приложении ASP.Net

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