Google的ProtoBuf序列化器性能的牛逼已经有目共睹了，可以把它应用到Socket通讯，队列，Wcf中，身为dotnet程序员一边期待着不久后Grpc对dotnet core的支持更期待着Wcf有一天能在Linux平台上闪瞎所有人。现在简单表述下Wcf中应用ProtoBuf替代默认的序列化器。
准备：
首先，新建一套Wcf的解决方案，包含服务，宿主外加两个客户端用来测试调用：
Wcf_ProtoBufSample.ClientViaMetaData会通过添加服务引用的方式调用服务，Wcf_ProtoBufSample.ClientViaReference则直接通过对Wcf_ProtoBufSample.Service添加引用来调动服务。
分别为每个项目对protobuf-net添加引用： install-package protobuf-net -Version 2.0.0.668（此处现在比较纠结，protobuf-net的最新版本是2.1.0.0，但现在移除了ProtoBuf.ServiceModel，目测是为了兼容dotnet core，估计以后还会再回来的。）
接下来在Wcf_ProtoBufSample.Service中简单定义个服务：
[ServiceContract, ProtoContract]
public interface IGreeterService
{
[OperationContract]
Reply Get(Request request);
}
public class GreeterService : IGreeterService
{
public Reply Get(Request request)
{
Reply reply = new Reply() { GreetInfo = "你好！" + request.Name + ",恭喜你" + request.Age + "岁了！" };
return reply;
}
}
[DataContract]
[ProtoContract]
public class Request
{
[DataMember(Order = )]
[ProtoMember()]
public string Name { set; get; }
[DataMember(Order = )]
[ProtoMember()]
public int Age { set; get; }
}
[DataContract]
[ProtoContract]
public class Reply
{
[DataMember(Order = )]
[ProtoMember()]
public string GreetInfo { set; get; }
}
代码中对DataMember添加了Order的特性，方便过会用。
配置宿主
在宿主中进行配置：
<system.serviceModel>
<services>
<service behaviorConfiguration="GreeterServiceBehavior" name="Wcf_ProtoBufSample.Service.GreeterService">
<endpoint
address="net.tcp://127.0.0.1:6978/GreeterService"
binding="netTcpBinding"
behaviorConfiguration="protoEndpointBehavior"
bindingConfiguration="DefaultTcpBinding"
contract="Wcf_ProtoBufSample.Service.IGreeterService">
</endpoint>
<endpoint
address="net.tcp://127.0.0.1:6976/mex"
binding="mexTcpBinding"
contract="IMetadataExchange">
</endpoint>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="GreeterServiceBehavior">
<serviceMetadata/>
<serviceDebug includeExceptionDetailInFaults="true"/>
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="protoEndpointBehavior">
<protobuf/>
</behavior>
</endpointBehaviors>
</behaviors>
<extensions>
<behaviorExtensions>
<add name="protobuf" type="ProtoBuf.ServiceModel.ProtoBehaviorExtension, protobuf-net, Version=2.0.0.668, Culture=neutral, PublicKeyToken=257b51d87d2e4d67"/>
</behaviorExtensions>
</extensions>
<bindings>
<netTcpBinding>
<binding name="DefaultTcpBinding"
closeTimeout="00:00:30"
openTimeout="00:00:30"
receiveTimeout="00:05:00"
sendTimeout="00:50:00"
transactionFlow="true"
transferMode="Buffered"
listenBacklog=""
maxBufferPoolSize=""
maxBufferSize=""
maxConnections=""
maxReceivedMessageSize="" >
</binding>
</netTcpBinding>
</bindings>
</system.serviceModel>
共享元数据的方式调用
然后在Wcf_ProtoBufSample.ClientViaReference项目中添加对Wcf_ProtoBufSample.Service的引用并配置客户端的调用信息：
<system.serviceModel>
<bindings>
<netTcpBinding>
<binding name="DefaultTcpBinding"
closeTimeout="00:00:30"
openTimeout="00:00:30"
receiveTimeout="00:05:00"
sendTimeout="00:50:00"
transactionFlow="true"
transferMode="Buffered"
listenBacklog=""
maxBufferPoolSize=""
maxBufferSize=""
maxConnections=""
maxReceivedMessageSize="" >
</binding>
</netTcpBinding>
</bindings>
<behaviors>
<endpointBehaviors>
<behavior name="protoEndpointBehavior">
<protobuf/>
</behavior>
</endpointBehaviors>
</behaviors>
<extensions>
<behaviorExtensions>
<add name="protobuf" type="ProtoBuf.ServiceModel.ProtoBehaviorExtension, protobuf-net, Version=2.0.0.668, Culture=neutral, PublicKeyToken=257b51d87d2e4d67"/>
</behaviorExtensions>
</extensions>
<client>
<endpoint address="net.tcp://127.0.0.1:6978/GreeterService"
binding="netTcpBinding"
bindingConfiguration="DefaultTcpBinding"
contract="Wcf_ProtoBufSample.Service.IGreeterService"
behaviorConfiguration="protoEndpointBehavior"
name="GreeterService">
</endpoint>
</client>
</system.serviceModel>
简单测试一下:
ChannelFactory<IGreeterService> factory = new ChannelFactory<IGreeterService>("GreeterService");
IGreeterService client = factory.CreateChannel();
var res = client.Get(new Request() {Name = "liam",Age = });
Console.WriteLine(res.GreetInfo);
Console.ReadKey();
通过添加服务引用或者WcfUtil
添加服务引用才是我们的最爱，简单快捷，易于维护：
在Wcf_ProtoBufSample.ClientViaMetaData中右键添加服务引用，这里我公开的地址是：net.tcp://127.0.0.1:6976/mex，
拿过来直接用肯定是不行的，毕竟我们已经修改了默认的序列化器，所以在配置中添加对ProtoBuf的配置信息，所以还是需要在配置中引用ProtoBuf的配置的：
<system.serviceModel>
<bindings>
<netTcpBinding>
<binding name="NetTcpBinding_IGreeterService" />
</netTcpBinding>
</bindings>
<client>
<endpoint address="net.tcp://127.0.0.1:6978/GreeterService"
behaviorConfiguration="protoEndpointBehavior"
binding="netTcpBinding"
bindingConfiguration="NetTcpBinding_IGreeterService"
contract="ServiceReference.IGreeterService"
name="NetTcpBinding_IGreeterService">
<identity>
<userPrincipalName value="DESKTOP-078UA43\admin" />
</identity>
</endpoint>
</client>
<behaviors>
<serviceBehaviors>
<behavior name="GreeterServiceBehavior">
<serviceMetadata/>
<serviceDebug includeExceptionDetailInFaults="true"/>
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="protoEndpointBehavior">
<protobuf/>
</behavior>
</endpointBehaviors>
</behaviors>
<extensions>
<behaviorExtensions>
<add name="protobuf" type="ProtoBuf.ServiceModel.ProtoBehaviorExtension, protobuf-net, Version=2.0.0.668, Culture=neutral, PublicKeyToken=257b51d87d2e4d67"/>
</behaviorExtensions>
</extensions>
</system.serviceModel>
简单调用一下进行测试：
GreeterServiceClient client=new GreeterServiceClient("NetTcpBinding_IGreeterService");
var res = client.Get(new Request() { Name = "liam", Age = });
Console.WriteLine(res.GreetInfo);
运行后发现报错了！
细致一些就不难发现，尽管我们的代理类生成的很简单快捷，但公开元数据的描述不会包含ProtoBuf特性的描述，所以此时我们定义的 [DataMember(Order = 0)]的Order属性此时就要发光发热了！接下来要修改的就是生成的代理类，添加ProtoBuf的序列号特性，在类上标注ProtoContract特性在属性上标注ProtoMember的特性，而且可以看着Order的顺序就行标注：
ProtoBuf的序列化是有顺序的，所以为了保证与服务端一致，此处需要谨慎（此处需要注意，更新服务引用小心自己定义的属性被覆盖）
简单测试：
Over!
（备注：貌似这么做比较复杂，毕竟开源的项目还是挺多的：https://github.com/maingi4/ProtoBuf.Services）