OpenReadCompletedEventArgs OpenReadCompletedEventArgs OpenReadCompletedEventArgs OpenReadCompletedEventArgs Class

Definición

Proporciona datos para el evento OpenReadCompleted.Provides data for the OpenReadCompleted event.

public ref class OpenReadCompletedEventArgs : System::ComponentModel::AsyncCompletedEventArgs
public class OpenReadCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs
type OpenReadCompletedEventArgs = class
    inherit AsyncCompletedEventArgs
Public Class OpenReadCompletedEventArgs
Inherits AsyncCompletedEventArgs
Herencia
OpenReadCompletedEventArgsOpenReadCompletedEventArgsOpenReadCompletedEventArgsOpenReadCompletedEventArgs

Ejemplos

En el ejemplo de código siguiente se muestra la descarga de un recurso para su lectura.The following code example demonstrates downloading a resource for reading.

void OpenResourceForReading2( String^ address )
{
   WebClient^ client = gcnew WebClient;
   Uri ^uri = gcnew Uri(address);

   client->OpenReadCompleted += gcnew OpenReadCompletedEventHandler( OpenReadCallback2 );
   client->OpenReadAsync( uri );
}


public static void OpenResourceForReading2 (string address)
{
    WebClient client = new WebClient ();
    Uri uri = new Uri(address);

    client.OpenReadCompleted += new OpenReadCompletedEventHandler(OpenReadCallback2);
    client.OpenReadAsync (uri);
}

Public Shared Sub OpenResourceForReading2(ByVal address As String)

	Dim client As WebClient = New WebClient()
	AddHandler client.OpenReadCompleted, AddressOf OpenReadCallback2
                      Dim uri as Uri = New Uri(address)
	client.OpenReadAsync(uri)                        
End Sub

El siguiente método se llama cuando se completa la descarga.The following method is called when the download completes.

void OpenReadCallback2( Object^ /*sender*/, OpenReadCompletedEventArgs^ e )
{
   Stream^ reply = nullptr;
   StreamReader^ s = nullptr;
   try
   {
      reply = dynamic_cast<Stream^>(e->Result);
      s = gcnew StreamReader( reply );
      Console::WriteLine( s->ReadToEnd() );
   }
   finally
   {
      if ( s != nullptr )
      {
         s->Close();
      }
      if ( reply != nullptr )
      {
         reply->Close();
      }
   }

}


private static void OpenReadCallback2 (Object sender, OpenReadCompletedEventArgs e)
{
    Stream reply = null;
    StreamReader s = null;

    try
    {
        reply = (Stream)e.Result;
        s = new StreamReader (reply);
        Console.WriteLine (s.ReadToEnd ());
    }
    finally
    {
        if (s != null)
        {
            s.Close ();
        }

        if (reply != null)
        {
            reply.Close ();
        }
    }
}

Private Shared Sub OpenReadCallback2(ByVal sender As Object, ByVal e As OpenReadCompletedEventArgs)

    Dim reply As Stream = Nothing
    Dim s As StreamReader = Nothing

    Try

        reply = CType(e.Result, Stream)
        s = New StreamReader(reply)
        Console.WriteLine(s.ReadToEnd())
    Finally

        If Not s Is Nothing Then

            s.Close()
        End If

        If Not reply Is Nothing Then

            reply.Close()
        End If
    End Try
End Sub

Comentarios

Las instancias de esta clase se pasan a OpenReadCompletedEventHandler métodos.Instances of this class are passed to OpenReadCompletedEventHandler methods.

Propiedades

Cancelled Cancelled Cancelled Cancelled

Obtiene un valor que indica si se ha cancelado una operación asincrónica.Gets a value indicating whether an asynchronous operation has been canceled.

(Inherited from AsyncCompletedEventArgs)
Error Error Error Error

Obtiene un valor que indica el error que se produjo durante una operación asincrónica.Gets a value indicating which error occurred during an asynchronous operation.

(Inherited from AsyncCompletedEventArgs)
Result Result Result Result

Obtiene una secuencia legible que contiene los datos descargados por un método DownloadDataAsync.Gets a readable stream that contains data downloaded by a DownloadDataAsync method.

UserState UserState UserState UserState

Obtiene el identificador único de la tarea asincrónica.Gets the unique identifier for the asynchronous task.

(Inherited from AsyncCompletedEventArgs)

Métodos

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determina si el objeto especificado es igual al objeto actual.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Sirve como la función hash predeterminada.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Obtiene el Type de la instancia actual.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Crea una copia superficial del objeto Object actual.Creates a shallow copy of the current Object.

(Inherited from Object)
RaiseExceptionIfNecessary() RaiseExceptionIfNecessary() RaiseExceptionIfNecessary() RaiseExceptionIfNecessary()

Genera una excepción proporcionada por el usuario si se ha producido un error en una operación asincrónica.Raises a user-supplied exception if an asynchronous operation failed.

(Inherited from AsyncCompletedEventArgs)
ToString() ToString() ToString() ToString()

Devuelve una cadena que representa el objeto actual.Returns a string that represents the current object.

(Inherited from Object)

Se aplica a