????????????????????????

??????????????TDD?????????????鷳????????????????????????????????????????????????????????????????????????????鷳??

?????????xunit?????????AutoRollbackAttribute??????????????? ^_^?????????????????????????

?????????AutorollbackAttribute?????????

public class AutoRollbackAttribute : BeforeAfterTestAttribute
{
    IsolationLevel isolationLevel = IsolationLevel.Unspecified;
    TransactionScope scope;
    TransactionScopeOption scopeOption = TransactionScopeOption.Required;
    long timeoutInMS = -1;

     /// <summary>
    /// Gets or sets the isolation level of the transaction.
    /// Default value is <see cref="IsolationLevel"/>.Unspecified.
    /// </summary>
    public IsolationLevel IsolationLevel
    {
        get { return isolationLevel; }
        set { isolationLevel = value; }
    }

     /// <summary>
    /// Gets or sets the scope option for the transaction.
    /// Default value is <see cref="TransactionScopeOption"/>.Required.
    /// </summary>
    public TransactionScopeOption ScopeOption
    {
        get { return scopeOption; }
        set { scopeOption = value; }
    }

     /// <summary>
    /// Gets or sets the timeout of the transaction?? in milliseconds.
    /// By default?? the transaction will not timeout.
    /// </summary>
    public long TimeoutInMS
    {
        get { return timeoutInMS; }
        set  { timeoutInMS = value; }
    }

     /// <summary>
    /// Rolls back the transaction.
    /// </summary>
    public override void After(MethodInfo methodUnderTest)
    {
        scope.Dispose();
    }

     /// <summary>
    /// Creates the transaction.
    /// </summary>
    public override void Before(MethodInfo methodUnderTest)
    {
        TransactionOptions options = new TransactionOptions();
        options.IsolationLevel = isolationLevel;
        if (timeoutInMS > 0)
           options.Timeout = new TimeSpan(timeoutInMS * 10);
        scope = new TransactionScope(scopeOption?? options);
    }
}

?????????????.Net Framework?????TransactionScope??TransactionScope??.NET 2.0???????????????????????????????????????????????????Щ????

????1???????????????

????2????????????????????????????????

???????????????????????????????????2?????????mongodb????????????????????????????????????????????????mongodb??????????