基于WS-AtomicTransaction标准的WCF远程分布式事务（一）

在[OperationBehavior(TransactionScopeRequired=true)]

    [ServiceContract()]
    public interface ICustomerService
    }

配置文件方面，我们使用customBinding（当然，也可以使用wsHttpBinding，它只支持WS-AT协议）。客户端配置如下：

    <system.serviceModel>
        <diagnostics>
            <messageLogging logEntireMessage="true" logMalformedMessages="true" logMessagesAtServiceLevel="true" logMessagesAtTransportLevel="true" />
        </diagnostics>
        <behaviors />
        <bindings>
            <customBinding>
                <binding name="httpWSAT">
                    <transactionFlow transactionProtocol="WSAtomicTransactionOctober2004" />
                    <httpTransport />
                </binding>
            </customBinding>
            <netTcpBinding>
                <binding name="netTCPWSAT" transactionFlow="true" transactionProtocol="OleTransactions" />
            </netTcpBinding>
            <wsHttpBinding>
                <binding name="wsTransaction" transactionFlow="true">
                    <security mode="None" />
                </binding>
            </wsHttpBinding>
        </bindings>
        <client>
            <endpoint address="http://li/CustomerService" binding="customBinding"
             bindingConfiguration="httpWSAT" contract="ICustomerService" name="ICustomerService">
                <identity>
                    <userPrincipalName value="domain\username" />
                </identity>
            </endpoint>
            <endpoint address="http://li/OrderService" binding="customBinding"
             bindingConfiguration="httpWSAT" contract="WCFTransactionClient.OrderService.IOrderService"
             name="IOrderService">
                <identity>
                    <userPrincipalName value="domain\username" />
                </identity>
            </endpoint>
        </client>
    </system.serviceModel>

服务器端配置：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.serviceModel>
        <diagnostics performanceCounters="Off" />
        <behaviors>
            <serviceBehaviors>
                <behavior name="metadataSupport">
                    <serviceMetadata httpGetEnabled="true" httpsGetEnabled="false" />
                </behavior>
            </serviceBehaviors>
        </behaviors>
        <bindings>
            <customBinding>
                <binding name="httpWSATBinding">
                    <transactionFlow transactionProtocol="WSAtomicTransactionOctober2004" />
                    <httpTransport/>
                </binding>
            </customBinding>
            <netTcpBinding>
                <binding name="netTCPWSATBinding" transactionFlow="true" transactionProtocol="WSAtomicTransactionOctober2004" />
            </netTcpBinding>
            <wsHttpBinding>
                <binding name="wsTransaction" transactionFlow="true">
                    <security mode="None" />
                </binding>
            </wsHttpBinding>
        </bindings>
        <services>
            <service behaviorConfiguration="metadataSupport" name="WCFTransactionLib.CustomerService">
                <endpoint address="" binding="customBinding" bindingConfiguration="httpWSATBinding"
                 contract="WCFTransactionLib.ICustomerService" />
                <host>
                    <baseAddresses>
                        <add baseAddress="http://li/CustomerService" />
                    </baseAddresses>
                </host>
            </service>
            <service behaviorConfiguration="metadataSupport" name="WCFTransactionLib.OrderService">
                <endpoint address="" binding="customBinding" bindingConfiguration="httpWSATBinding"
                 contract="WCFTransactionLib.IOrderService" />
                <host>
                    <baseAddresses>
                        <add baseAddress="http://li/OrderService" />
                    </baseAddresses>
                </host>
            </service>
        </services>
    </system.serviceModel>
</configuration>

配置文件里面有一点需要注意的，就是在endpoint address和baseAddress中使用的地址中的服务器地址必须使用和生成X.509证书一样的地址，比如必须用http://MachineA.cos.com，而不是http://192.168.1.101或者http://MachineA。这个是ssl证书的要求：）

废话少说了，先附上测试用的源代码吧
/Files/walkinhill/wcftransactiondemosolutionnew.zip
已经写了不少了，只好把通过分析WCF程序之间交互的消息来看看WS-AT的原理的。只好留作下一篇在写WS-AT消息的内容和WS-AT和OleTx协议的一些差别了：）

参考资料：
http://msdn2.microsoft.com/en-us/library/ms733943.aspx