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OpenWriteCompletedEventArgs Class

Provides data for the OpenWriteCompleted event.

Namespace:  System.Net
Assembly:  System (in System.dll)
'Declaration
Public Class OpenWriteCompletedEventArgs _
	Inherits AsyncCompletedEventArgs

The OpenWriteCompletedEventArgs type exposes the following members.

  NameDescription
Public propertyCancelledGets a value indicating whether an asynchronous operation has been canceled. (Inherited from AsyncCompletedEventArgs.)
Public propertyErrorGets a value indicating which error occurred during an asynchronous operation. (Inherited from AsyncCompletedEventArgs.)
Public propertyResultGets a writable stream that is used to send data to a server.
Public propertyUserStateGets the unique identifier for the asynchronous task. (Inherited from AsyncCompletedEventArgs.)
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  NameDescription
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodRaiseExceptionIfNecessaryRaises a user-supplied exception if an asynchronous operation failed. (Inherited from AsyncCompletedEventArgs.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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Instances of this class are passed to OpenWriteCompletedEventHandler methods.

The following code example demonstrates opening a stream to write data to be uploaded.

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

The following method is called when the stream is available.

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

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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