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WCF服务自定义配置

.netwcf.net-3.5
6
在托管多个WCF服务的应用程序中，为每个服务添加自定义配置信息的最佳方法是什么？例如，您可能想要传递或设置公司名称，指定服务的连接字符串或其他参数。
我猜这可以通过实现IServiceBehavior来实现。
例如....
<behaviors>
  <serviceBehaviors>
    <behavior name="MyBehavior">
      <serviceMetadata httpGetEnabled="true" />
      <serviceDebug />
      <customBehavior myCompany="ABC" />
    </behavior>
    <behavior name="MyOtherBehavior">
      <serviceMetadata httpGetEnabled="true" />
      <serviceDebug />
      <customBehavior myCompany="DEF" />
    </behavior>
  </serviceBehaviors>
</behaviors>

<services>
  <service behaviorConfiguration="MyBehavior" name="MyNameSpace.MyService">
    <endpoint address="" behaviorConfiguration="" binding="netTcpBinding" 
      name="TcpEndpoint" contract="MyNameSpace.IMyService" />
    <endpoint address="mex" binding="mexTcpBinding" bindingConfiguration=""
      name="TcpMexEndpoint" contract="IMetadataExchange" />
    <host>
      <baseAddresses>
        <add baseAddress="net.tcp://localhost:4000/MyService" />
      </baseAddresses>
    </host>
  </service>
  <service behaviorConfiguration="MyOtherBehavior" name="MyNameSpace.MyOtherService">
    <endpoint address="" behaviorConfiguration="" binding="netTcpBinding" 
      name="TcpEndpoint" contract="MyNameSpace.IMyOtherService" />
    <endpoint address="mex" binding="mexTcpBinding" bindingConfiguration=""
      name="TcpMexEndpoint" contract="IMetadataExchange" />
    <host>
      <baseAddresses>
        <add baseAddress="net.tcp://localhost:4000/MyOtherService" />
      </baseAddresses>
    </host>
  </service>
</services>

假设它们具有某个公司名称的共同接口，将ABC设置在MyService上，DEF设置在MyOtherService上。

有人可以详细说明如何实现吗？

TIA

迈克尔

4个回答
9

我知道这个问题很旧，但是它从未被标记为已回答，所以我想试着回答一下。如果我理解你的意思，你可以使用自定义ServiceHostFactory来完成它。
这篇文章详细介绍了如何实现：这里。

你可以按照以下方式设置自定义ServiceHostFactory：

<%@ ServiceHost
 Language="C#"
 Debug="true"
 Service="Ionic.Samples.Webservices.Sep20.CustomConfigService"
 Factory="Ionic.ServiceModel.ServiceHostFactory"%>

然后，在您的ServiceHostFactory中，您可以重写一个名为ApplyConfiguration的方法。 通常对于在IIS中托管的WCF应用程序，WCF会自动查找web.config中的配置。 在这个示例中，我们覆盖了该行为，首先查找以WCF服务描述命名的配置文件。

protected override void ApplyConfiguration()
{
    // generate the name of the custom configFile, from the service name:
    string configFilename = System.IO.Path.Combine ( physicalPath,
        String.Format("{0}.config", this.Description.Name));

    if (string.IsNullOrEmpty(configFilename) || !System.IO.File.Exists(configFilename))
        base.ApplyConfiguration();
    else
        LoadConfigFromCustomLocation(configFilename);
}

你可以将此替换为“任何内容” - 例如，在数据库表中查找配置。

还有一些方法来完成这个谜题。

private string _physicalPath = null;
private string physicalPath
{
    get
    {
        if (_physicalPath == null)
        {
            // if hosted in IIS
            _physicalPath = System.Web.Hosting.HostingEnvironment.ApplicationPhysicalPath;

            if (String.IsNullOrEmpty(_physicalPath))
            {
                // for hosting outside of IIS
                _physicalPath= System.IO.Directory.GetCurrentDirectory();
            }
        }
        return _physicalPath;
    }
}


private void LoadConfigFromCustomLocation(string configFilename)
{
    var filemap = new System.Configuration.ExeConfigurationFileMap();
    filemap.ExeConfigFilename = configFilename;
    System.Configuration.Configuration config =
        System.Configuration.ConfigurationManager.OpenMappedExeConfiguration
        (filemap,
         System.Configuration.ConfigurationUserLevel.None);
    var serviceModel = System.ServiceModel.Configuration.ServiceModelSectionGroup.GetSectionGroup(config);
    bool loaded= false;
    foreach (System.ServiceModel.Configuration.ServiceElement se in serviceModel.Services.Services)
    {
        if(!loaded)
            if (se.Name == this.Description.ConfigurationName)
            {
                base.LoadConfigurationSection(se);
                loaded= true;
            }
    }

    if (!loaded)
        throw new ArgumentException("ServiceElement doesn't exist");
}
3

我遇到了类似的问题，但我使用的是DuplexChannel。 基于我发现的文章，我是这样解决的：

public class CustomDuplexChannelFactory<TChannel> : DuplexChannelFactory<TChannel>
{
    public static string ConfigurationPath { get; set; }

    public CustomDuplexChannelFactory(InstanceContext callbackInstance)
        : base(callbackInstance)
    {
    }

    protected override ServiceEndpoint CreateDescription()
    {
        ServiceEndpoint serviceEndpoint = base.CreateDescription();

        if(ConfigurationPath == null || !File.Exists(ConfigurationPath))
            return base.CreateDescription();

        ExeConfigurationFileMap executionFileMap = new ExeConfigurationFileMap();
        executionFileMap.ExeConfigFilename = ConfigurationPath;
        System.Configuration.Configuration config = ConfigurationManager.OpenMappedExeConfiguration(executionFileMap, ConfigurationUserLevel.None);
        ServiceModelSectionGroup serviceModeGroup = ServiceModelSectionGroup.GetSectionGroup(config);
        ChannelEndpointElement selectedEndpoint = null;
        foreach(ChannelEndpointElement endpoint in serviceModeGroup.Client.Endpoints)
        {
            if(endpoint.Contract == serviceEndpoint.Contract.ConfigurationName)
            {
                selectedEndpoint = endpoint; break;
            }
        }
        if(selectedEndpoint != null)
        {
            if(serviceEndpoint.Binding == null)
            {
                serviceEndpoint.Binding = CreateBinding(selectedEndpoint.Binding, serviceModeGroup);
            } if(serviceEndpoint.Address == null)
            {
                serviceEndpoint.Address = new EndpointAddress(selectedEndpoint.Address,
                GetIdentity(selectedEndpoint.Identity), selectedEndpoint.Headers.Headers);
            } if(serviceEndpoint.Behaviors.Count == 0 && !String.IsNullOrEmpty(selectedEndpoint.BehaviorConfiguration))
            {
                AddBehaviors(selectedEndpoint.BehaviorConfiguration,
                    serviceEndpoint, serviceModeGroup);
            }
            serviceEndpoint.Name = selectedEndpoint.Contract;
        }
        return serviceEndpoint;
    }

    private Binding CreateBinding(string bindingName, ServiceModelSectionGroup group)
    {
        BindingCollectionElement bindingElementCollection = group.Bindings[bindingName];
        if(bindingElementCollection.ConfiguredBindings.Count > 0)
        {
            IBindingConfigurationElement be = bindingElementCollection.ConfiguredBindings[0];
            Binding binding = GetBinding(be); if(be != null)
            {
                be.ApplyConfiguration(binding);
            }
            return binding;
        }
        return null;
    }

    private void AddBehaviors(string behaviorConfiguration, ServiceEndpoint serviceEndpoint, ServiceModelSectionGroup group)
    {
        EndpointBehaviorElement behaviorElement = group.Behaviors.EndpointBehaviors[behaviorConfiguration];
        for(int i = 0; i < behaviorElement.Count; i++)
        {
            BehaviorExtensionElement behaviorExtension = behaviorElement[i];
            object extension = behaviorExtension.GetType().InvokeMember("CreateBehavior", BindingFlags.InvokeMethod | BindingFlags.NonPublic | BindingFlags.Instance, null, behaviorExtension, null);
            if(extension != null)
            {
                serviceEndpoint.Behaviors.Add((IEndpointBehavior)extension);
            }
        }
    }

    private EndpointIdentity GetIdentity(IdentityElement element)
    {
        EndpointIdentity identity = null;
        PropertyInformationCollection properties = element.ElementInformation.Properties;
        if(properties["userPrincipalName"].ValueOrigin != PropertyValueOrigin.Default)
        {
            return EndpointIdentity.CreateUpnIdentity(element.UserPrincipalName.Value);
        }
        if(properties["servicePrincipalName"].ValueOrigin != PropertyValueOrigin.Default)
        {
            return EndpointIdentity.CreateSpnIdentity(element.ServicePrincipalName.Value);
        }
        if(properties["dns"].ValueOrigin != PropertyValueOrigin.Default)
        {
            return EndpointIdentity.CreateDnsIdentity(element.Dns.Value);
        }
        if(properties["rsa"].ValueOrigin != PropertyValueOrigin.Default)
        {
            return EndpointIdentity.CreateRsaIdentity(element.Rsa.Value);
        }
        if(properties["certificate"].ValueOrigin != PropertyValueOrigin.Default)
        {
            X509Certificate2Collection supportingCertificates = new X509Certificate2Collection();
            supportingCertificates.Import(Convert.FromBase64String(element.Certificate.EncodedValue));

            if(supportingCertificates.Count == 0)
            {
                throw new InvalidOperationException("UnableToLoadCertificateIdentity");
            }

            X509Certificate2 primaryCertificate = supportingCertificates[0]; supportingCertificates.RemoveAt(0);
            return EndpointIdentity.CreateX509CertificateIdentity(primaryCertificate, supportingCertificates);
        }
        return identity;
    }

    private Binding GetBinding(IBindingConfigurationElement configurationElement)
    {
        if(configurationElement is CustomBindingElement)
            return new CustomBinding();
        else if(configurationElement is BasicHttpBindingElement)
            return new BasicHttpBinding();
        else if(configurationElement is NetMsmqBindingElement)
            return new NetMsmqBinding();
        else if(configurationElement is NetNamedPipeBindingElement)
            return new NetNamedPipeBinding();
        else if(configurationElement is NetPeerTcpBindingElement)
            return new NetPeerTcpBinding();
        else if(configurationElement is NetTcpBindingElement)
            return new NetTcpBinding();
        else if(configurationElement is WSDualHttpBindingElement)
            return new WSDualHttpBinding();
        else if(configurationElement is WSHttpBindingElement)
            return new WSHttpBinding();
        else if(configurationElement is WSFederationHttpBindingElement)
            return new WSFederationHttpBinding();
        return null;
    }
}

我在我的博客中总结了这个问题：链接。
0

这取决于您期望在哪里和如何使用该信息。如果它不会对基础架构产生太大影响（即使得服务运行和处理请求），我倾向于认为尝试将其推入WCF行为中可能会增加更多的复杂性，而这并不值得。也许使用自定义配置部分会更简单。

您能否澄清您期望在运行时如何使用此信息？也许这样我们可以提供更明确的建议...

0

嗯，我认为我给出的例子已经相当详细了。我会尝试进一步阐述...

基本上，我想要能够向运行多个WCF服务的应用程序中的WCF服务传递自定义配置数据。

这意味着在应用程序中运行的服务实例中，我希望访问已针对该服务配置的数据（而不是另一个服务）。我想我可以通过使用应用程序设置并将服务类型用作键来简单地完成此操作。我希望WCF可能有更好的构造来实现这一点。

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