最近打算开始学习一下wcf,做了一个简单的例子，但是发现使用IIS发布WCF服务总是不能成功。出现以下错误。
1 Server Error in '/wcfservices' Application.
2 --------------------------------------------------------------------------------
3
4 The contract name 'Contracts.ICalculators' could not be found in the list of contracts implemented by the service 'CalculatorService'.
5 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.
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7 Exception Details: System.InvalidOperationException: The contract name 'Contracts.ICalculators' could not be found in the list of contracts implemented by the service 'CalculatorService'.
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9 Source Error:
10
11 An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
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13 Stack Trace:
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16 [InvalidOperationException: The contract name 'Contracts.ICalculators' could not be found in the list of contracts implemented by the service 'CalculatorService'.]
17 System.ServiceModel.Description.ConfigLoader.LookupContract(String contractName, String serviceName) +16521861
18 System.ServiceModel.Description.ConfigLoader.LoadServiceDescription(ServiceHostBase host, ServiceDescription description, ServiceElement serviceElement, Action`1 addBaseAddress) +421
19 System.ServiceModel.ServiceHostBase.ApplyConfiguration() +156
20 System.ServiceModel.ServiceHostBase.InitializeDescription(UriSchemeKeyedCollection baseAddresses) +215
21 System.ServiceModel.ServiceHost..ctor(Type serviceType, Uri[] baseAddresses) +475
22 System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(Type serviceType, Uri[] baseAddresses) +43
23 System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) +530
24 System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath) +1423
25 System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +50
26 System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +1172
27
28 [ServiceActivationException: The service '/wcfservices/CalculatorService.svc' cannot be activated due to an exception during compilation. The exception message is: The contract name 'Contracts.ICalculators' could not be found in the list of contracts implemented by the service 'CalculatorService'..]
29 System.Runtime.AsyncResult.End(IAsyncResult result) +900320
30 System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +191134
31 System.Web.AsyncEventExecutionStep.OnAsyncEventCompletion(IAsyncResult ar) +107
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Google了一把，发现出现这个错误主要可能由以下两种情况导致：
1、This message is often due to an IIS 7 config problem. If you are used to creating a virtual directory pointing to the folder where your service resides, that no longer works. Now, you need to use the "Create Application..." option instead.
2、The problem could also be a in a different namespace in svc file as it is in svc.cs file.In svc file namespace must be in the following format.
Service="Namespace.SvcClassName"
修改以后两个问题之后，服务就可以顺利访问了。