UnhandledExceptionAction 枚举

  • 参考

定义

命名空间:
System.Activities
程序集:
System.Activities.dll

指定当异常转义工作流的根时发生的操作。

public enum class UnhandledExceptionAction
public enum UnhandledExceptionAction
type UnhandledExceptionAction = 
Public Enum UnhandledExceptionAction
继承
Object
ValueType
Enum
UnhandledExceptionAction

字段

Abort 0

指定 WorkflowApplication 应中止工作流。 这会导致调用在中止进程完成时由 Aborted 返回的委托。 未处理的异常将用作中止原因。
Cancel 1

指定 WorkflowApplication 应安排取消根活动并恢复执行。 这会导致调用在取消进程完成时由 Completed 属性返回的委托。
Terminate 2

指定 WorkflowApplication 应安排终止根活动并恢复执行。 这会导致调用在终止进程完成时分配给 Completed 属性的委托。 未处理的异常将用作终止原因。 如果未指定 OnUnhandledException 处理程序，默认操作为 Terminate。

示例

下面的示例调用了引发异常的工作流。 工作流未处理异常，并且 OnUnhandledException 处理程序已被调用。 将检查 WorkflowApplicationUnhandledExceptionEventArgs 以提供有关异常的信息，且终止工作流。

Activity wf = new Sequence
{
    Activities =
     {
         new WriteLine
         {
             Text = "Starting the workflow."
         },
         new Throw
        {
            Exception = new InArgument<Exception>((env) =>
                new ApplicationException("Something unexpected happened."))
        },
        new WriteLine
         {
             Text = "Ending the workflow."
         }
     }
};

WorkflowApplication wfApp = new WorkflowApplication(wf);

wfApp.OnUnhandledException = delegate(WorkflowApplicationUnhandledExceptionEventArgs e)
{
    // Display the unhandled exception.
    Console.WriteLine("OnUnhandledException in Workflow {0}\n{1}",
        e.InstanceId, e.UnhandledException.Message);

    Console.WriteLine("ExceptionSource: {0} - {1}",
        e.ExceptionSource.DisplayName, e.ExceptionSourceInstanceId);

    // Instruct the runtime to terminate the workflow.
    return UnhandledExceptionAction.Terminate;
};

wfApp.Aborted = delegate(WorkflowApplicationAbortedEventArgs e)
{
    // Display the exception that caused the workflow
    // to abort.
    Console.WriteLine("Workflow {0} Aborted.", e.InstanceId);
    Console.WriteLine("Exception: {0}\n{1}",
        e.Reason.GetType().FullName,
        e.Reason.Message);
};

wfApp.Completed = delegate(WorkflowApplicationCompletedEventArgs e)
{
    if (e.CompletionState == ActivityInstanceState.Faulted)
    {
        Console.WriteLine("Workflow {0} Terminated.", e.InstanceId);
        Console.WriteLine("Exception: {0}\n{1}",
            e.TerminationException.GetType().FullName,
            e.TerminationException.Message);
    }
    else if (e.CompletionState == ActivityInstanceState.Canceled)
    {
        Console.WriteLine("Workflow {0} Canceled.", e.InstanceId);
    }
    else
    {
        Console.WriteLine("Workflow {0} Completed.", e.InstanceId);

        // Retrieve the outputs of the workflow.
        foreach (var kvp in e.Outputs)
        {
            Console.WriteLine("Name: {0} - Value {1}",
                kvp.Key, kvp.Value);
        }

        // Outputs can be directly accessed by argument name.
        // Console.WriteLine("The winner is {0}.", e.Outputs["Winner"]);
    }
};

wfApp.Run();

下面的示例调用了引发异常的工作流。 工作流未处理异常，并且 OnUnhandledException 处理程序已被调用。 将检查 WorkflowApplicationUnhandledExceptionEventArgs 以提供有关异常的信息，且终止工作流。

Activity wf = new Sequence
{
    Activities =
     {
         new WriteLine
         {
             Text = "Starting the workflow."
         },
         new Throw
        {
            Exception = new InArgument<Exception>((env) =>
                new ApplicationException("Something unexpected happened."))
        },
        new WriteLine
         {
             Text = "Ending the workflow."
         }
     }
};

WorkflowApplication wfApp = new WorkflowApplication(wf);

wfApp.OnUnhandledException = delegate(WorkflowApplicationUnhandledExceptionEventArgs e)
{
    // Display the unhandled exception.
    Console.WriteLine("OnUnhandledException in Workflow {0}\n{1}",
        e.InstanceId, e.UnhandledException.Message);

    Console.WriteLine("ExceptionSource: {0} - {1}",
        e.ExceptionSource.DisplayName, e.ExceptionSourceInstanceId);

    // Instruct the runtime to abort the workflow.
    return UnhandledExceptionAction.Abort;
};

wfApp.Aborted = delegate(WorkflowApplicationAbortedEventArgs e)
{
    // Display the exception that caused the workflow
    // to abort.
    Console.WriteLine("Workflow {0} Aborted.", e.InstanceId);
    Console.WriteLine("Exception: {0}\n{1}",
        e.Reason.GetType().FullName,
        e.Reason.Message);
};

wfApp.Completed = delegate(WorkflowApplicationCompletedEventArgs e)
{
    if (e.CompletionState == ActivityInstanceState.Faulted)
    {
        Console.WriteLine("Workflow {0} Terminated.", e.InstanceId);
        Console.WriteLine("Exception: {0}\n{1}",
            e.TerminationException.GetType().FullName,
            e.TerminationException.Message);
    }
    else if (e.CompletionState == ActivityInstanceState.Canceled)
    {
        Console.WriteLine("Workflow {0} Canceled.", e.InstanceId);
    }
    else
    {
        Console.WriteLine("Workflow {0} Completed.", e.InstanceId);

        // Outputs can be retrieved from the Outputs dictionary,
        // keyed by argument name.
        // Console.WriteLine("The winner is {0}.", e.Outputs["Winner"]);
    }
};

wfApp.Run();

下面的示例调用了引发异常的工作流。 工作流未处理异常，并且 OnUnhandledException 处理程序已被调用。 将检查 WorkflowApplicationUnhandledExceptionEventArgs 以提供有关异常的信息，且取消工作流。

Activity wf = new Sequence
{
    Activities =
     {
         new WriteLine
         {
             Text = "Starting the workflow."
         },
         new Throw
        {
            Exception = new InArgument<Exception>((env) =>
                new ApplicationException("Something unexpected happened."))
        },
        new WriteLine
         {
             Text = "Ending the workflow."
         }
     }
};

WorkflowApplication wfApp = new WorkflowApplication(wf);

wfApp.OnUnhandledException = delegate(WorkflowApplicationUnhandledExceptionEventArgs e)
{
    // Display the unhandled exception.
    Console.WriteLine("OnUnhandledException in Workflow {0}\n{1}",
        e.InstanceId, e.UnhandledException.Message);

    Console.WriteLine("ExceptionSource: {0} - {1}",
        e.ExceptionSource.DisplayName, e.ExceptionSourceInstanceId);

    // Instruct the runtime to cancel the workflow.
    return UnhandledExceptionAction.Cancel;
};

wfApp.Aborted = delegate(WorkflowApplicationAbortedEventArgs e)
{
    // Display the exception that caused the workflow
    // to abort.
    Console.WriteLine("Workflow {0} Aborted.", e.InstanceId);
    Console.WriteLine("Exception: {0}\n{1}",
        e.Reason.GetType().FullName,
        e.Reason.Message);
};

wfApp.Completed = delegate(WorkflowApplicationCompletedEventArgs e)
{
    if (e.CompletionState == ActivityInstanceState.Faulted)
    {
        Console.WriteLine("Workflow {0} Terminated.", e.InstanceId);
        Console.WriteLine("Exception: {0}\n{1}",
            e.TerminationException.GetType().FullName,
            e.TerminationException.Message);
    }
    else if (e.CompletionState == ActivityInstanceState.Canceled)
    {
        Console.WriteLine("Workflow {0} Canceled.", e.InstanceId);
    }
    else
    {
        Console.WriteLine("Workflow {0} Completed.", e.InstanceId);

        // Outputs can be retrieved from the Outputs dictionary,
        // keyed by argument name.
        // Console.WriteLine("The winner is {0}.", e.Outputs["Winner"]);
    }
};

wfApp.Run();

注解

如果异常转义工作流的根，则将调用 OnUnhandledException 函数。 WorkflowApplicationUnhandledExceptionEventArgs 提供对异常以及指向生成异常的 Activity 的指针的访问。 如果未 OnUnhandledException 指定处理程序，则终止是默认操作。

适用于