Explicit transaction management
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WCF services can work directly against a transactional resource and manage the transaction explicitly using programming models such as that offered by ADO.NET
[ServiceContract]
interface IMyContract
{
[OperationContract]
void operation( );
}
class MyService : IMyContract
{
public void operation( )
{
//Avoid this programming model:
string str = "...";
IDbConnection connection = new SqlConnection(str);
connection.Open( );
IDbCommand idbcomm = new SqlCommand( );
idbcomm.Connection = connection;
IDbTransaction transaction = connection.BeginTransaction( );//Enlisting
idbcomm.Transaction = transaction;
try
{
/* Interact with database here, then commit the transaction */
transaction.Commit( );
}
catch
{
transaction.Rollback( ); //Abort transaction
}
finally
{
connection.Close( );
idbcomm.Dispose( );
transaction.Dispose( );
}
}
}
WCF Resource Managers:
A WCF Resource Manager (RM) is any resource that supports both automatic enlistment and the two-phase commit protocol managed by one of WCF's transaction managers.
The resource must detect that it is being accessed by a transaction and automatically enlist in it exactly once. The RM can be either a durable resource or a volatile resource, such as a transactional integer, string, or collection.
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