DownloadDataCompletedEventArgs.Result Property
Definition
Important
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Gets the data that is downloaded by a DownloadDataAsync method.
public:
property cli::array <System::Byte> ^ Result { cli::array <System::Byte> ^ get(); };
public byte[] Result { get; }
member this.Result : byte[]
Public ReadOnly Property Result As Byte()
Property Value
A Byte array that contains the downloaded data.
Examples
The following code example displays the value of this property.
void DownloadDataCallback( Object^ /*sender*/, DownloadDataCompletedEventArgs^ e )
{
System::Threading::AutoResetEvent^ waiter = dynamic_cast<System::Threading::AutoResetEvent^>(e->UserState);
try
{
// If the request was not canceled and did not throw
// an exception, display the resource.
if ( !e->Cancelled && e->Error == nullptr )
{
array<Byte>^data = dynamic_cast<array<Byte>^>(e->Result);
String^ textData = System::Text::Encoding::UTF8->GetString( data );
Console::WriteLine( textData );
}
}
finally
{
// Let the main application thread resume.
waiter->Set();
}
}
private static void DownloadDataCallback(Object sender, DownloadDataCompletedEventArgs e)
{
System.Threading.AutoResetEvent waiter = (System.Threading.AutoResetEvent)e.UserState;
try
{
// If the request was not canceled and did not throw
// an exception, display the resource.
if (!e.Cancelled && e.Error == null)
{
byte[] data = (byte[])e.Result;
string textData = System.Text.Encoding.UTF8.GetString(data);
Console.WriteLine(textData);
}
}
finally
{
// Let the main application thread resume.
waiter.Set();
}
}
Private Shared Sub DownloadDataCallback(ByVal sender As Object, ByVal e As DownloadDataCompletedEventArgs)
Dim waiter As System.Threading.AutoResetEvent = CType(e.UserState, System.Threading.AutoResetEvent)
Try
' If the request was not canceled and did not throw
' an exception, display the resource.
If e.Cancelled = False AndAlso e.Error Is Nothing Then
Dim data() As Byte = CType(e.Result, Byte())
Dim textData As String = System.Text.Encoding.UTF8.GetString(data)
Console.WriteLine(textData)
End If
Finally
' Let the main application thread resume.
waiter.Set()
End Try
End Sub
Remarks
You should check the Error and Cancelled properties before using the data that is returned by this property. If the Error property's value is an Exception object or the Cancelled property's value is true
, the asynchronous operation did not complete correctly and the Result property's value will not be valid.
Applies to
Зворотний зв’язок
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