AggregateException Classe

Definição

public ref class AggregateException : Exception

public class AggregateException : Exception

[System.Serializable]
public class AggregateException : Exception

type AggregateException = class
    inherit Exception

[<System.Serializable>]
type AggregateException = class
    inherit Exception

Public Class AggregateException
Inherits Exception

Herança

Object

Exception

AggregateException

Atributos

SerializableAttribute

Exemplos

O exemplo a seguir captura a AggregateException exceção e chama o Handle método para lidar com cada exceção que ele contém. Compilar e executar o exemplo com a primeira task1 variável deve resultar em um AggregateException objeto que contenha uma exceção UnauthorizedAccessException . Comentar essa linha, descompactar a segunda task1 variável e compilar e executar o exemplo produz um AggregateException objeto que contém uma exceção IndexOutOfRangeException .

using System;
using System.IO;
using System.Threading.Tasks;

class Example
{
   static async Task Main(string[] args)
   {
      // Get a folder path whose directories should throw an UnauthorizedAccessException.
      string path = Directory.GetParent(
                              Environment.GetFolderPath(
                              Environment.SpecialFolder.UserProfile)).FullName;

      // Use this line to throw UnauthorizedAccessException, which we handle.
      Task<string[]> task1 = Task<string[]>.Factory.StartNew(() => GetAllFiles(path));

      // Use this line to throw an exception that is not handled.
      // Task task1 = Task.Factory.StartNew(() => { throw new IndexOutOfRangeException(); } );
      try
      {
          await task1;
      }
      catch (UnauthorizedAccessException)
      {
          Console.WriteLine("Caught unauthorized access exception-await behavior");
      }
      catch (AggregateException ae)
      {
          Console.WriteLine("Caught aggregate exception-Task.Wait behavior");
          ae.Handle((x) =>
          {
              if (x is UnauthorizedAccessException) // This we know how to handle.
              {
                  Console.WriteLine("You do not have permission to access all folders in this path.");
                  Console.WriteLine("See your network administrator or try another path.");
                  return true;
              }
              return false; // Let anything else stop the application.
          });
      }

      Console.WriteLine("task1 Status: {0}{1}", task1.IsCompleted ? "Completed," : "",
                                                task1.Status);
   }

   static string[] GetAllFiles(string str)
   {
      // Should throw an UnauthorizedAccessException exception.
      return System.IO.Directory.GetFiles(str, "*.txt", System.IO.SearchOption.AllDirectories);
   }
}
// The example displays the following output if the file access task is run:
//       You do not have permission to access all folders in this path.
//       See your network administrator or try another path.
//       task1 Status: Completed,Faulted
// It displays the following output if the second task is run:
//       Unhandled Exception: System.AggregateException: One or more errors occurred. ---
//       > System.IndexOutOfRangeException: Index was outside the bounds of the array.
//          at Example.<Main>b__0()
//          at System.Threading.Tasks.Task.Execute()
//          --- End of inner exception stack trace ---
//          at System.AggregateException.Handle(Func`2 predicate)
//          at Example.Main(String[] args)

open System
open System.IO
open System.Threading.Tasks

let getAllFiles str =
    // Should throw an UnauthorizedAccessException exception.
    System.IO.Directory.GetFiles(str, "*.txt", System.IO.SearchOption.AllDirectories)

// Get a folder path whose directories should throw an UnauthorizedAccessException.
let path =
    let directory =
        Environment.SpecialFolder.UserProfile
        |> Environment.GetFolderPath
        |> Directory.GetParent
    directory.FullName

// Use this line to throw an exception that is not handled.
// let task1 = Task<string []>.Factory.StartNew(fun () -> raise (IndexOutOfRangeException()) )
let task1 = Task.Factory.StartNew(fun () -> getAllFiles (path))

let execute () =
    try
        task1.Wait()
    with
    | :? UnauthorizedAccessException -> printfn "Caught unauthorized access exception-await behavior"
    | :? AggregateException as ae ->
        printfn "Caught aggregate exception-Task.Wait behavior"

        ae.Handle (fun x ->
            match x with
            | :? UnauthorizedAccessException ->
                printfn "You do not have permission to access all folders in this path."
                printfn "See your network administrator or try another path."
                true
            | _ -> false)
    printfn $"""task1 Status: {if task1.IsCompleted then "Completed," else ""}{task1.Status}"""

execute ()

// The example displays the following output if the file access task is run:
//       You do not have permission to access all folders in this path.
//       See your network administrator or try another path.
//       task1 Status: Completed,Faulted
// It displays the following output if the second task is run:
//       Unhandled exception. System.AggregateException: One or more errors occurred. (Index was outside the bounds of the array.) (Index was outside the bounds of the array.)
//        ---> System.IndexOutOfRangeException: Index was outside the bounds of the array.
//          at Exception1.task1@19.Invoke()
//          at System.Threading.Tasks.Task`1.InnerInvoke()
//          at System.Threading.Tasks.Task.<>c.<.cctor>b__277_0(Object obj)
//          at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)   
//       --- End of stack trace from previous location ---
//          at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)   
//          at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
//          --- End of inner exception stack trace ---
//          at System.AggregateException.Handle(Func`2 predicate)
//          at <StartupCode$exception1>.$Exception1.main@()

Imports System.IO
Imports System.Threading.Tasks

Module Example
    Sub Main()
        ' Get a folder path whose directories should throw an UnauthorizedAccessException.
        Dim path As String = Directory.GetParent(
                                       Environment.GetFolderPath(
                                       Environment.SpecialFolder.UserProfile)).FullName

        ' Use this line to throw UnauthorizedAccessException, which we handle.
        Dim task1 = Task(Of String()).Factory.StartNew(Function() GetAllFiles(path))

        ' Use this line to throw an exception that is not handled.
        ' Task task1 = Task.Factory.StartNew(Sub() Throw New IndexOutOfRangeException() )
        Try
            task1.Wait()
        Catch ae As AggregateException
            ae.Handle(Function(x)
                          If TypeOf (x) Is UnauthorizedAccessException Then ' This we know how to handle
                              Console.WriteLine("You do not have permission to access all folders in this path.")
                              Console.WriteLine("See your network administrator or try another path.")
                              Return True
                          Else
                              Return False ' Let anything else stop the application.
                          End If
                      End Function)
        End Try

      Console.WriteLine("task1 Status: {0}{1}", If(task1.IsCompleted, "Completed,", ""), 
                                                task1.Status)
    End Sub

    Function GetAllFiles(ByVal str As String) As String()
        ' Should throw an UnauthorizedAccessException exception. 
        Return System.IO.Directory.GetFiles(str, "*.txt", System.IO.SearchOption.AllDirectories)
    End Function
End Module

Comentários

AggregateException é usado para consolidar várias falhas em um único objeto de exceção que pode ser gerado. Ele é usado extensivamente na TPL (Biblioteca Paralela de Tarefas) e linq paralela (PLINQ). Para obter mais informações, consulte Tratamento de Exceções e Como lidar com exceções em uma consulta PLINQ. Para obter mais informações, consulte a entrada Aggregating Exceptions no blog .NET Matters.

Acesso thread-safe

Todos os membros públicos e protegidos AggregateException são thread-safe e podem ser usados simultaneamente de vários threads.