我创建了一个 WCF 服务,并通过工作角色将其托管在云中。不幸的是,当我尝试连接到辅助角色服务时,我收到一条异常消息:“主机 3a5c0cdffcf04d069dbced5e590bca70.cloudapp.net 不存在 DNS 条目。” 3a5c0cdffcf04d069dbced5e590bca70.cloudapp.net 是部署在 azure 暂存环境中的辅助角色的地址。workerrole.cs 具有以下代码来公开 WCF 服务:
public override void Run()
{
using (ServiceHost host = new ServiceHost(typeof(MyService)))
{
string ip = RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["tcppoint"].IPEndpoint.Address.ToString();
int tcpport = RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["tcppoint"].IPEndpoint.Port;
int mexport = RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["mexinput"].IPEndpoint.Port;
// Add a metadatabehavior for client proxy generation
// The metadata is exposed via net.tcp
ServiceMetadataBehavior metadatabehavior = new ServiceMetadataBehavior();
host.Description.Behaviors.Add(metadatabehavior);
Binding mexBinding = MetadataExchangeBindings.CreateMexTcpBinding();
string mexlistenurl = string.Format("net.tcp://{0}:{1}/MyServiceMetaDataEndpoint", ip, mexport);
string mexendpointurl = string.Format("net.tcp://{0}:{1}/MyServiceMetaDataEndpoint", RoleEnvironment.GetConfigurationSettingValue("Domain"), 8001);
host.AddServiceEndpoint(typeof(IMetadataExchange), mexBinding, mexendpointurl, new Uri(mexlistenurl));
// Add the endpoint for MyService
string listenurl = string.Format("net.tcp://{0}:{1}/MyServiceEndpoint", ip, tcpport);
string endpointurl = string.Format("net.tcp://{0}:{1}/MyServiceEndpoint", RoleEnvironment.GetConfigurationSettingValue("Domain"), 9001);
host.AddServiceEndpoint(typeof(IMyService), new NetTcpBinding(SecurityMode.None), endpointurl, new Uri(listenurl));
host.Open();
while (true)
{
Thread.Sleep(100000);
Trace.WriteLine("Working", "Information");
}
}
}
tcppoint 和 mexinput 配置了端口 8001 和 9001。Domain 还配置了工作角色部署 url:3a5c0cdffcf04d069dbced5e590bca70.cloudapp.net
在客户端部分(控制台应用程序),我们在 app.config 中使用以下配置:
<bindings>
<netTcpBinding>
<binding name="NetTcpBinding_IMyService" closeTimeout="00:01:00"
openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions"
hostNameComparisonMode="StrongWildcard" listenBacklog="10"
maxBufferPoolSize="524288" maxBufferSize="65536" maxConnections="10"
maxReceivedMessageSize="65536">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<reliableSession ordered="true" inactivityTimeout="00:50:00"
enabled="false" />
<security mode="None">
<transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />
<message clientCredentialType="Windows" />
</security>
</binding>
</netTcpBinding>
</bindings>
<client>
<endpoint address="httpp:\\3a5c0cdffcf04d069dbced5e590bca70.cloudapp.net:9001/MyServiceEndpoint" binding="netTcpBinding"
bindingConfiguration="NetTcpBinding_IMyService" contract="ServiceReference1.IMyService"
name="NetTcpBinding_IMyService" />
</client>
<behaviors>
<serviceBehaviors>
<behavior name="behave">
<serviceMetadata httpGetEnabled="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
<system.net>
<defaultProxy useDefaultCredentials="true">
<proxy autoDetect="False" usesystemdefault="False" bypassonlocal="True" />
</defaultProxy>
以下代码是使用 msdn 中提供的示例代码作为背景构建的。在本地,它工作正常。不幸的是,当我将它部署到云时,会发生异常。此外,当我使用虚拟 ip 而不是 url 时,会发生连接超时,除非远程机器没有响应。