AddServiceEndpoint 抛出键为空？

Question

使用 ServiceHost.AddServiceEndpoint 添加自定义 ProtoEndpointBehavior 时出现以下异常：

System.ArgumentNullException: Value cannot be null. Parameter name: key at System.Collections.Generic.Dictionary2.FindEntry(TKey key) at System.Collections.Generic.Dictionary2.ContainsKey(TKey key) at System.ServiceModel.ServiceHostBase.ImplementedContractsContractResolver.ResolveContract(String contractName) at System.ServiceModel.ServiceHostBase.ServiceAndBehaviorsContractResolver.ResolveContract(String contractName) at System.ServiceModel.Description.ConfigLoader.LookupContractForStandardEndpoint(String contractName, String serviceName) at System.ServiceModel.Description.ConfigLoader.LookupContract(String contractName, String serviceName) at System.ServiceModel.ServiceHostBase.AddServiceEndpoint(ServiceEndpoint endpoint) at My.Service.Business.ServiceHandler.StartService(Type serviceType, String uri, SecureConnectionSettings secureConnectionSettings) in C:\My\Produkter\My Utveckling\Solution\My.Service.Business\ServiceHandler.cs:line 150

代码如下所示：

ServiceHost serviceHost = null;
Console.WriteLine("Creating service " + serviceType.FullName);
serviceHost = new MyServiceHost(serviceType, new Uri(uri));

var endPointAddress = "";

HttpBindingBase binding = null;
if (secureConnectionSettings != null && secureConnectionSettings.Enabled)
{
    Console.WriteLine("Setting certificates");
    X509Store store = new X509Store(secureConnectionSettings.CertificateStore, secureConnectionSettings.CertificateLocation);
    store.Open(OpenFlags.ReadOnly);
    X509Certificate2Collection certs = store.Certificates.Find(X509FindType.FindByThumbprint, secureConnectionSettings.Thumbprint, true);
    store.Close();

    if (certs.Count > 0)
        serviceHost.Credentials.ServiceCertificate.SetCertificate(secureConnectionSettings.CertificateLocation,
                                                                secureConnectionSettings.CertificateStore,
                                                                X509FindType.FindByThumbprint,
                                                                secureConnectionSettings.Thumbprint);
    else
        throw new Exception("Could not finde certificate with thumbprint " + secureConnectionSettings.Thumbprint);

    endPointAddress = uri + "/BinaryHttpsProto";
    binding = CreateNetHttpsBinding(secureConnectionSettings);
}
else
{
    endPointAddress = uri + "/BinaryHttpProto";
    binding = CreateNetHttpBinding();
}

var endpoint = new System.ServiceModel.Description.ServiceEndpoint(new System.ServiceModel.Description.ContractDescription(typeof(IMyClientService).FullName), 
    binding, 
    new EndpointAddress(endPointAddress));

endpoint.EndpointBehaviors.Add(new ProtoBuf.ServiceModel.ProtoEndpointBehavior());
serviceHost.AddServiceEndpoint(endpoint);

Console.WriteLine("Starting service...");
serviceHost.Open();
Console.WriteLine("Service started successfully (" + uri + ")");
return serviceHost;

我过去常常在配置文件中这样设置：

  <endpointBehaviors>
    <behavior name="protoEndpointBehavior">
      <protobuf />
    </behavior>
  </endpointBehaviors>

现在我需要在代码中添加它。

怎么了？

Answer 1

这是一个 known bug 并且有解决方法。

获取 ContractDescription 实例时，使用静态方法 ContractDescription.GetContract(Type) 而不是直接 ContractDescription() 构造函数：

var endpoint = new System.ServiceModel.Description.ServiceEndpoint(System.ServiceModel.Description.ContractDescription.GetContract(typeof(IMyClientService)), 
    binding, 
    new EndpointAddress(endPointAddress));

我能够重现你的问题，这个解决方法对我有用。

Answer 2

您看到异常的原因是因为 ServiceEndpoint 假定您使用配置文件。它正在尝试检索并解析您不存在的合同、绑定和地址，因为您没有使用配置文件。

ServiceEndpoint（见备注）

Use this constructor when the binding and address for the endpoint are provided in configuration.

create or retrieve a ContractDescription对象有多种方法：

var contractUsingName = new ContractDescription("IProtoBufService");
var contractUsingNameWithNameSpace = new ContractDescription("IProtoBufService", "http://www.tempuri.org");
var contractUsingContractType = ContractDescription.GetContract(typeof(IProtoBufService));
var contractUsingContractTypeAndObjectImp = ContractDescription.GetContract(typeof(IProtoBufService), ProtoBufService);
var contractUsingContractTypeAndObjectType = ContractDescription.GetContract(typeof(IProtoBufService), typeof(ProtoBufService));

如果您真的坚持以编程方式创建 ContractDescription 您需要定义以下一些内容：

合同描述
操作说明
消息描述
OperationBehaviorAttribute
和其他东西...

或者你可以按照这个 blog 作为踢球者。

你试过CodeFuller的回答了吗？他的回答可以让你的生活更轻松。我进行了快速检查，它起作用了。

class Program
{
    static void Main()
    {
        var baseAddress = new Uri("http://localhost:8080/ProtoBuf");

        using (var serviceHost = new ServiceHost(typeof(ProtoBufService), baseAddress))
        {
            var endpoint = new ServiceEndpoint(ContractDescription.GetContract(typeof(IProtoBufService)),
                new NetHttpBinding(),
                new EndpointAddress(baseAddress));

            endpoint.EndpointBehaviors.Add(new ProtoEndpointBehavior());
            serviceHost.AddServiceEndpoint(endpoint);

            serviceHost.Open();
            Console.ReadKey();
        }
    }
}

不幸的是，我无法附上图片 "something's wrong with imgur" 但它可以在我的网络浏览器上运行。虽然我还没有使用客户端应用程序进行测试，但我想你已经接近解决方案了。

提示：不要混用配置文件和代码，因为这样很难维护。 "Which you probably knew"祝你好运:)

AddServiceEndpoint 抛出键为空？

AddServiceEndpoint throws key is null?

.net

c#

wcf

endpoint