DependentCloneOption 枚举
定义
控制要创建的依赖事务的种类。Controls what kind of dependent transaction to create.
public enum class DependentCloneOption
public enum DependentCloneOption
type DependentCloneOption =
Public Enum DependentCloneOption
- 继承
字段
| BlockCommitUntilComplete | 0 | 依赖事务阻塞事务的提交过程,直至父事务超时或 Complete() 被调用。The dependent transaction blocks the commit process of the transaction until the parent transaction times out, or Complete() is called. 在此情况下,可以在该事务上完成附加工作,并且可以创建新的登记。In this case, additional work can be done on the transaction and new enlistments can be created. |
| RollbackIfNotComplete | 1 | 如果在调用 Complete() 之前在父事务上调用了“提交”,则依赖事务将自动中止该事务。The dependent transaction automatically aborts the transaction if Commit is called on the parent transaction before Complete() is called. |
示例
下面的示例演示如何创建从属事务。The following example shows you how to create a dependent transaction.
static void Main(string[] args)
{
try
{
using (TransactionScope scope = new TransactionScope())
{
// Perform transactional work here.
//Queue work item
ThreadPool.QueueUserWorkItem(new WaitCallback(WorkerThread), Transaction.Current.DependentClone(DependentCloneOption.BlockCommitUntilComplete));
//Display transaction information
Console.WriteLine("Transaction information:");
Console.WriteLine("ID: {0}", Transaction.Current.TransactionInformation.LocalIdentifier);
Console.WriteLine("status: {0}", Transaction.Current.TransactionInformation.Status);
Console.WriteLine("isolationlevel: {0}", Transaction.Current.IsolationLevel);
//Call Complete on the TransactionScope based on console input
ConsoleKeyInfo c;
while (true)
{
Console.Write("Complete the transaction scope? [Y|N] ");
c = Console.ReadKey();
Console.WriteLine();
if ((c.KeyChar == 'Y') || (c.KeyChar == 'y'))
{
//Call complete on the scope
scope.Complete();
break;
}
else if ((c.KeyChar == 'N') || (c.KeyChar == 'n'))
{
break;
}
}
}
}
catch (System.Transactions.TransactionException ex)
{
Console.WriteLine(ex);
}
catch
{
Console.WriteLine("Cannot complete transaction");
throw;
}
}
private static void WorkerThread(object transaction)
{
//Create a DependentTransaction from the object passed to the WorkerThread
DependentTransaction dTx = (DependentTransaction)transaction;
//Sleep for 1 second to force the worker thread to delay
Thread.Sleep(1000);
//Pass the DependentTransaction to the scope, so that work done in the scope becomes part of the transaction passed to the worker thread
using (TransactionScope ts = new TransactionScope(dTx))
{
//Perform transactional work here.
//Call complete on the transaction scope
ts.Complete();
}
//Call complete on the dependent transaction
dTx.Complete();
}
Public Shared Sub Main()
Try
Using scope As TransactionScope = New TransactionScope()
'Perform transactional work here.
'Queue work item
ThreadPool.QueueUserWorkItem(AddressOf WorkerThread, Transaction.Current.DependentClone(DependentCloneOption.BlockCommitUntilComplete))
'Display transaction information
Console.WriteLine("Transaction information:")
Console.WriteLine("ID: {0}", Transaction.Current.TransactionInformation.LocalIdentifier)
Console.WriteLine("status: {0}", Transaction.Current.TransactionInformation.Status)
Console.WriteLine("isolationlevel: {0}", Transaction.Current.IsolationLevel)
'Call Complete on the TransactionScope based on console input
Dim c As ConsoleKeyInfo
While (True)
Console.Write("Complete the transaction scope? [Y|N] ")
c = Console.ReadKey()
Console.WriteLine()
If (c.KeyChar = "Y") Or (c.KeyChar = "y") Then
scope.Complete()
Exit While
ElseIf ((c.KeyChar = "N") Or (c.KeyChar = "n")) Then
Exit While
End If
End While
End Using
Catch ex As TransactionException
Console.WriteLine(ex)
Catch
Console.WriteLine("Cannot complete transaction")
Throw
End Try
End Sub
Public Shared Sub WorkerThread(ByVal myTransaction As Object)
'Create a DependentTransaction from the object passed to the WorkerThread
Dim dTx As DependentTransaction
dTx = CType(myTransaction, DependentTransaction)
'Sleep for 1 second to force the worker thread to delay
Thread.Sleep(1000)
'Pass the DependentTransaction to the scope, so that work done in the scope becomes part of the transaction passed to the worker thread
Using ts As TransactionScope = New TransactionScope(dTx)
'Perform transactional work here.
'Call complete on the transaction scope
ts.Complete()
End Using
'Call complete on the dependent transaction
dTx.Complete()
End Sub
注解
可以使用方法获取从属事务 DependentClone ,并使用 DependentCloneOption 参数控制要创建的依赖事务类型。A dependent transaction can be obtained using the DependentClone method, with the DependentCloneOption parameter controlling what kind of dependent transaction to create. 有关如何使用此枚举的详细信息,请参阅使用 DependentTransaction 管理并发。For more information on how this enumeration is used, see Managing Concurrency with DependentTransaction.