How to know if the code is inside TransactionScope?

Question

What is the best way to know if the code block is inside TransactionScope?
Is Transaction.Current a realiable way to do it or there are any subtleties?
Is it possible to access internal ContextData.CurrentData.CurrentScope (in System.Transactions) with reflection? If yes, how?

Answer 1

Transaction.Current should be reliable; I've just checked, at this works fine with suppressed transactions, too:

Console.WriteLine(Transaction.Current != null); // false
using (TransactionScope tran = new TransactionScope())
{
    Console.WriteLine(Transaction.Current != null); // true
    using (TransactionScope tran2 = new TransactionScope(
          TransactionScopeOption.Suppress))
    {
        Console.WriteLine(Transaction.Current != null); // false
    }
    Console.WriteLine(Transaction.Current != null); // true
}
Console.WriteLine(Transaction.Current != null); // false