There seem to be several ways to create/fix this issue. For me, the CRM product I am using was written in native code and is able to call my .NET dll, but I run into the configuration information needing to be at/above the main application. For me, the CRM application isn't .NET, so I ended up having to put it in my machine.config file (not where I want it). In addition, since my company uses Websense I had a hard time even adding the Service Reference due to a 407 Proxy Authentication Required issue, that to required a modification to the machine.cong.

代理解决方案:

为了让WCF服务引用工作，我必须从我的DLL的app.config复制信息到主应用程序配置(但对我来说是machine.config)。我还必须将端点信息复制到同一个文件中。一旦我这么做了，它就开始为我工作了。

如果在类库中引用web服务，则必须将app.config复制到windows应用程序或控制台应用程序中

解决方案:将外部项目的配置与类库的wcf配置相同。

为我工作

我遇到了同样的问题，但是更改契约名称空间对我不起作用。所以我尝试了。net 2风格的web引用，而不是。net 3.5的服务引用。这工作。

要在Visual Studio 2008中使用Web引用，请单击“添加服务引用”，然后在出现对话框时单击“高级”。您将发现一个选项，该选项允许您使用Web引用而不是服务引用。

对使用服务的非库应用程序进行单元测试可能会导致此问题。

The information that others have entered addresses the root cause of this. If you are trying to write automated test cases and the unit you are testing will actually invoke the service interface, you need to add the service reference to the test project. This is a flavor of the application using library type of error. I did not immediately realize this though because my code that consumes the interface is not in a library. However, when the test actually runs it will be running from the test assembly, not the assembly under test.

向单元测试项目添加服务引用解决了我的问题。

“如果在类库中调用服务，并从另一个项目调用类库，则可能出现此错误。” 在这种情况下，如果是winapp或web，则需要将WS配置设置包含到主项目app.config中。如果它是一个web应用程序，就配置它。这是即使使用PRISM和WPF/Silverlight的方式。”

是的，但是如果你不能改变主项目(例如Orchard CMS)，你可以在你的项目中保留WCF服务配置。

你需要用客户端生成方法创建一个服务助手:

public static class ServiceClientHelper
{
    public static T GetClient<T>(string moduleName) where T : IClientChannel
    {
        var channelType = typeof(T);
        var contractType = channelType.GetInterfaces().First(i => i.Namespace == channelType.Namespace);
        var contractAttribute = contractType.GetCustomAttributes(typeof(ServiceContractAttribute), false).First() as ServiceContractAttribute;

        if (contractAttribute == null)
            throw new Exception("contractAttribute not configured");

        //path to your lib app.config (mark as "Copy Always" in properties)
        var configPath = HostingEnvironment.MapPath(String.Format("~/Modules/{0}/bin/{0}.dll.config", moduleName)); 

        var configuration = ConfigurationManager.OpenMappedExeConfiguration(new ExeConfigurationFileMap { ExeConfigFilename = configPath }, ConfigurationUserLevel.None);
        var serviceModelSectionGroup = ServiceModelSectionGroup.GetSectionGroup(configuration);

        if (serviceModelSectionGroup == null)
            throw new Exception("serviceModelSectionGroup not configured");

        var endpoint = serviceModelSectionGroup.Client.Endpoints.OfType<ChannelEndpointElement>().First(e => e.Contract == contractAttribute.ConfigurationName);
        var channelFactory = new ConfigurationChannelFactory<T>(endpoint.Name, configuration, null);
        var client = channelFactory.CreateChannel();
        return client;
    }
}

并使用它:

using (var client = ServiceClientHelper.GetClient<IDefaultNameServiceChannel>(yourLibName)) {
                ... get data from service ...
            }

详见本文。

我在ASP中得到这个错误。其中WCF服务已添加到正在添加到asp.net应用程序中的类库中。. NET应用程序作为bin文件夹中引用的.dll文件。为了解决这个错误，需要将类库中引用WCF服务的app.config文件中的配置设置复制到web中。配置设置的ASP。网网站/应用程序。