OpenWriteCompletedEventArgs OpenWriteCompletedEventArgs OpenWriteCompletedEventArgs OpenWriteCompletedEventArgs Class

Определение

Предоставляет данные для события OpenWriteCompleted.Provides data for the OpenWriteCompleted event.

public ref class OpenWriteCompletedEventArgs : System::ComponentModel::AsyncCompletedEventArgs
public class OpenWriteCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs
type OpenWriteCompletedEventArgs = class
    inherit AsyncCompletedEventArgs
Public Class OpenWriteCompletedEventArgs
Inherits AsyncCompletedEventArgs
Наследование
OpenWriteCompletedEventArgsOpenWriteCompletedEventArgsOpenWriteCompletedEventArgsOpenWriteCompletedEventArgs

Примеры

В следующем примере кода демонстрируется открытие потока для записи данных для передачи.The following code example demonstrates opening a stream to write data to be uploaded.

void OpenResourceForPosting( String^ address )
{
   WebClient^ client = gcnew WebClient;
   Uri ^uri = gcnew Uri(address);
   
   // Specify that the OpenWriteCallback method gets called
   // when the writeable stream is available.
   client->OpenWriteCompleted += gcnew OpenWriteCompletedEventHandler( OpenWriteCallback2 );
   client->OpenWriteAsync( uri );
   
   // Applications can perform other tasks
   // while waiting for the upload to complete.
}


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

    // Specify that the OpenWriteCallback method gets called
    // when the writeable stream is available.
    client.OpenWriteCompleted += new OpenWriteCompletedEventHandler (OpenWriteCallback2);
    client.OpenWriteAsync (uri);
    // Applications can perform other tasks
    // while waiting for the upload to complete.
}

Public Shared Sub OpenResourceForPosting(ByVal address As String)

	Dim client As WebClient = New WebClient()
	'  Specify that the OpenWriteCallback method gets called
	'  when the writeable stream is available.
	AddHandler client.OpenWriteCompleted, AddressOf OpenWriteCallback2
                      Dim uri as Uri = New Uri(address)
	client.OpenWriteAsync(uri)
	'  Applications can perform other tasks
	'  while waiting for the upload to complete.
End Sub

Следующий метод вызывается, когда поток доступен.The following method is called when the stream is available.

void OpenWriteCallback2( Object^ /*sender*/, OpenWriteCompletedEventArgs^ e )
{
   Stream^ body = nullptr;
   StreamWriter^ s = nullptr;
   try
   {
      body = dynamic_cast<Stream^>(e->Result);
      s = gcnew StreamWriter( body );
      s->AutoFlush = true;
      s->Write( "This is content data to be sent to the server." );
   }
   finally
   {
      if ( s != nullptr )
      {
         s->Close();
      }
      if ( body != nullptr )
      {
         body->Close();
      }
   }

}


private static void OpenWriteCallback2 (Object sender, OpenWriteCompletedEventArgs e)
{
    Stream body = null;
    StreamWriter s = null;

    try
    {
        body = (Stream)e.Result;
        s = new StreamWriter (body);
        s.AutoFlush = true;
        s.Write ("This is content data to be sent to the server.");
    }
    finally
    {
        if (s != null)
        {
            s.Close ();
        }

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

Private Shared Sub OpenWriteCallback2(ByVal sender As Object, ByVal e As OpenWriteCompletedEventArgs)

    Dim body As Stream = Nothing
    Dim s As StreamWriter = Nothing

    Try

        body = CType(e.Result, Stream)
        s = New StreamWriter(body)
        s.AutoFlush = True
        s.Write("This is content data to be sent to the server.")
    Finally

        If Not s Is Nothing Then

            s.Close()
        End If

        If Not body Is Nothing Then

            body.Close()
        End If
    End Try
End Sub

Комментарии

Экземпляры этого класса передаются OpenWriteCompletedEventHandler методам.Instances of this class are passed to OpenWriteCompletedEventHandler methods.

Свойства

Cancelled Cancelled Cancelled Cancelled

Возвращает значение, показывающее, была ли отменена асинхронная операция.Gets a value indicating whether an asynchronous operation has been canceled.

(Inherited from AsyncCompletedEventArgs)
Error Error Error Error

Возвращает значение, показывающее, какая ошибка произошла в течение асинхронной операции.Gets a value indicating which error occurred during an asynchronous operation.

(Inherited from AsyncCompletedEventArgs)
Result Result Result Result

Возвращает доступный для записи поток, который используется для отправки данных на сервер.Gets a writable stream that is used to send data to a server.

UserState UserState UserState UserState

Возвращает уникальный идентификатор для асинхронной задачи.Gets the unique identifier for the asynchronous task.

(Inherited from AsyncCompletedEventArgs)

Методы

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

Определяет, равен ли заданный объект текущему объекту.Determines whether the specified object is equal to the current object.

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

Служит хэш-функцией по умолчанию.Serves as the default hash function.

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

Возвращает объект Type для текущего экземпляра.Gets the Type of the current instance.

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

Создает неполную копию текущего объекта Object.Creates a shallow copy of the current Object.

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

Вызывает предоставленное пользователем исключение в случае неудачного выполнения асинхронной операции.Raises a user-supplied exception if an asynchronous operation failed.

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

Возвращает строку, представляющую текущий объект.Returns a string that represents the current object.

(Inherited from Object)

Применяется к