.NET Core调用WCF的最佳实践

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现在.NET Core貌似很火，与其他.NET开发者交流不说上几句.NET Core都感觉自己落伍了一样。但是冷静背后我们要也看到.NET Core目前还有太多不足，别的不多说，与自家的服务框架WCF集成起来就不咋地，从最初不支持，到现在有个笨笨咔咔的Web Service Reference Provider，生成的代理类简直不堪入目，还特别的慢。所以本人本着为将来框架的兼容性做准备，就着手研究了下能不能不通过代理类访问WCF，好在微软开源了一部分WCF代码。

WCF的开发者一定很熟悉，WCF的所有配置都是可以通过代码和配置文件两种方式，而大多数开发者都会选择配置文件，但是从.NET Core开始，微软干掉了Web/App.config，不知道别人怎么样，反正我是非常之不习惯。干掉Web/App.config的后果，就是开源支持.NET Core的那部分Client Side没有配置文件的支持，翻看源码后发现，只要是读取配置文件的地方，都是这样的代码 —— PlatformNotSupported。

protected void InitializeEndpoint(string configurationName, EndpointAddress address)
{
_serviceEndpoint = this.CreateDescription(); ServiceEndpoint serviceEndpointFromConfig = null; // Project N and K do not support System.Configuration, but this method is part of Windows Store contract.
// The configurationName==null path occurs in normal use.
if (configurationName != null)
{
throw ExceptionHelper.PlatformNotSupported();
// serviceEndpointFromConfig = ConfigLoader.LookupEndpoint(configurationName, address, this.serviceEndpoint.Contract);
}
}

但是好在微软又推出了System.Configuration.ConfigurationManager的NuGet包，所以本人仿照WCF原生的配置文件，自己实现一套配置，经过两个晚上的战斗，已经成功。好了，废话不多说，上代码了。

先看看最终的效果是什么样的，WCF服务端的代码结构如下：

采用标准的WCF分层方式，用控制台做宿主，其中IAppService项目版本为.NET Standard 2.0，每个终结点同时使用BasicHttpBinding与NetTcpBinding双重绑定，配置文件如下：

<?xml version="1.0" encoding="utf-8"?>
<configuration>

<system.serviceModel>

<services>

<service behaviorConfiguration="DefaultBehavior" name="WCF.AppService.Implements.ProductService">
<host>
<baseAddresses>
<add baseAddress="http://localhost:8098/Hosts/ProductService.svc" />
<add baseAddress="net.tcp://localhost:8099/Hosts/ProductService.svc" />
</baseAddresses>
</host>
<endpoint binding="basicHttpBinding" bindingConfiguration="basicBinding" contract="WCF.IAppService.Interfaces.IProductService" />
<endpoint binding="netTcpBinding" bindingConfiguration="tcpBinding" contract="WCF.IAppService.Interfaces.IProductService" />
</service>

<service behaviorConfiguration="DefaultBehavior" name="WCF.AppService.Implements.OrderService">
<host>
<baseAddresses>
<add baseAddress="http://localhost:8098/Hosts/OrderService.svc" />
<add baseAddress="net.tcp://localhost:8099/Hosts/OrderService.svc" />
</baseAddresses>
</host>
<endpoint binding="basicHttpBinding" bindingConfiguration="basicBinding" contract="WCF.IAppService.Interfaces.IOrderService" />
<endpoint binding="netTcpBinding" bindingConfiguration="tcpBinding" contract="WCF.IAppService.Interfaces.IOrderService" />
</service>

<service behaviorConfiguration="DefaultBehavior" name="WCF.AppService.Implements.IntegrationService">
<host>
<baseAddresses>
<add baseAddress="http://localhost:8098/Hosts/IntegrationService.svc" />
<add baseAddress="net.tcp://localhost:8099/Hosts/IntegrationService.svc" />
</baseAddresses>
</host>
<endpoint binding="basicHttpBinding" bindingConfiguration="basicBinding" contract="WCF.IAppService.Interfaces.IIntegrationService" />
<endpoint binding="netTcpBinding" bindingConfiguration="tcpBinding" contract="WCF.IAppService.Interfaces.IIntegrationService" />
</service>
</services>

<behaviors>
<serviceBehaviors>
<behavior name="DefaultBehavior">

<serviceMetadata httpGetEnabled="true" />

<useRequestHeadersForMetadataAddress />

<serviceDebug includeExceptionDetailInFaults="true" />

<dataContractSerializer maxItemsInObjectGraph="2147483647" />
</behavior>
</serviceBehaviors>
</behaviors>

<bindings>
<netTcpBinding>
<binding name="tcpBinding" maxBufferPoolSize="2147483647" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" closeTimeout="00:10:00" openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:10:00" />
</netTcpBinding>
<basicHttpBinding>
<binding name="basicBinding" maxBufferPoolSize="2147483647" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" closeTimeout="00:10:00" openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:10:00" />
</basicHttpBinding>
</bindings>

<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
</configuration>

运行测试没问题，服务端不多说，重点是客户端，因为IAppService是.NET Standard 2.0的类库版本，所以.NET Core客户端是可以正常引用的，新建.NET Core控制台，并引用上述IAppService项目。

客户端项目结构如下：

客户端配置文件如下：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>

<section name="system.serviceModel" type="System.ServiceModel.ServiceModelSection, System.ServiceModel.Toolkits" />
</configSections> 
<system.serviceModel>

<client>

<endpoint address="net.tcp://localhost:8099/Hosts/ProductService.svc" binding="netTcpBinding" contract="WCF.IAppService.Interfaces.IProductService" name="WCF.IAppService.Interfaces.IProductService">
<headerProvider type="WCF.Core.Client.HeaderProviders.MyHeaderProvider" assembly="WCF.Core.Client"/>
</endpoint>

<endpoint address="net.tcp://localhost:8099/Hosts/OrderService.svc" binding="netTcpBinding" contract="WCF.IAppService.Interfaces.IOrderService" name="WCF.IAppService.Interfaces.IOrderService" />

<endpoint address="net.tcp://localhost:8099/Hosts/IntegrationService.svc" binding="netTcpBinding" contract="WCF.IAppService.Interfaces.IIntegrationService" name="WCF.IAppService.Interfaces.IIntegrationService" />
</client>
</system.serviceModel>
</configuration>

Main方法中代码如下：

class Program
{
static void Main(string[] args)
{
//初始化容器
IContainer container = InitContainer(); //调用
IProductService productService = container.Resolve<IProductService>();
string products = productService.GetProducts(); Console.WriteLine(products); container.Dispose();
Console.ReadKey();
} static IContainer InitContainer()
{
ContainerBuilder builder = new ContainerBuilder();
Assembly wcfInterfaceAssembly = Assembly.Load("WCF.IAppService"); //获取WCF接口类型集
IEnumerable<Type> types = wcfInterfaceAssembly.GetTypes().Where(type => type.IsInterface); //获取服务代理泛型类型
Type proxyGenericType = typeof(ServiceProxy<>); //注册WCF接口
foreach (Type type in types)
{
Type proxyType = proxyGenericType.MakeGenericType(type);
PropertyInfo propChannel = proxyType.GetProperty(ServiceProxy.ChannelPropertyName, type); builder.RegisterType(proxyType).OnRelease(proxy => ((IDisposable)proxy).Dispose());
builder.Register(container => propChannel.GetValue(container.Resolve(proxyType))).
As(type).
OnRelease(channel => channel.CloseChannel());
} return builder.Build();
}
}