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Tip of the Day
Language: VB7
Expertise: Intermediate
Dec 10, 2002

Select the transaction isolation level and timeout in a serviced component

Writing a transactional COM+ component with VB.NET is as simple as applying the Transaction attribute to a class that inherits from System.EnterpriseServices.ServicedComponent:

Imports System.EnterpriseServices

< Transaction()> Public Class BankTransfer
    Inherits ServicedComponent
    ' ...
End Class
If you don't pass any argument to the attribute's constructor, the class is marked as requiring a transaction. You can explicitly set the transaction behavior by passing a TransactionOption enumerated value, which can be Disabled, NotSupported, Supported, Required, and RequiresNew:

< Transaction( TransactionOption.RequiresNew )>
Even more interesting, you can set the isolation level for the transaction being used, by setting the Isolation property, which in turn can take a TransactionIsolationLevel enumerated value (Any, ReadUncommitted, ReadCommitted, RepeatableRead, or Serializable), and even set the transaction timeout by setting the Timeout property, if you want to override the global timeout value:

< Transaction( TransactionOption.RequiresNew, _
    Isolation:=TransactionIsolationLevel.Repeatable, Timeout:=10 )>
Francesco Balena
 
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