WebClient.UploadProgressChanged Ereignis
Definition
Wichtig
Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.
Tritt ein, wenn Daten teilweise oder vollständig erfolgreich über einen asynchronen Upload übertragen werden.
public:
event System::Net::UploadProgressChangedEventHandler ^ UploadProgressChanged;
public event System.Net.UploadProgressChangedEventHandler? UploadProgressChanged;
public event System.Net.UploadProgressChangedEventHandler UploadProgressChanged;
member this.UploadProgressChanged : System.Net.UploadProgressChangedEventHandler
Public Custom Event UploadProgressChanged As UploadProgressChangedEventHandler
Public Event UploadProgressChanged As UploadProgressChangedEventHandler
Ereignistyp
Beispiele
Im folgenden Codebeispiel wird das Festlegen eines Ereignishandlers für dieses Ereignis veranschaulicht.
// Sample call: UploadFileInBackground2("http://www.contoso.com/fileUpload.aspx", "data.txt")
void UploadFileInBackground2( String^ address, String^ fileName )
{
WebClient^ client = gcnew WebClient;
Uri ^uri = gcnew Uri(address);
client->UploadFileCompleted +=
gcnew UploadFileCompletedEventHandler (UploadFileCallback2);
// Specify a progress notification handler.
client->UploadProgressChanged +=
gcnew UploadProgressChangedEventHandler( UploadProgressCallback );
client->UploadFileAsync( uri, "POST", fileName );
Console::WriteLine( "File upload started." );
}
// Sample call: UploadFileInBackground2("http://www.contoso.com/fileUpload.aspx", "data.txt")
public static void UploadFileInBackground2(string address, string fileName)
{
WebClient client = new WebClient();
Uri uri = new Uri(address);
client.UploadFileCompleted += new UploadFileCompletedEventHandler(UploadFileCallback2);
// Specify a progress notification handler.
client.UploadProgressChanged += new UploadProgressChangedEventHandler(UploadProgressCallback);
client.UploadFileAsync(uri, "POST", fileName);
Console.WriteLine("File upload started.");
}
' Sample call: UploadFileInBackground2("http:' www.contoso.com/fileUpload.aspx", "data.txt")
Public Shared Sub UploadFileInBackground2(ByVal address As String, ByVal fileName As String)
Dim client As WebClient = New WebClient()
Dim uri as Uri = New Uri(address)
AddHandler client.UploadFileCompleted, AddressOf UploadFileCallback2
' Specify a progress notification handler.
AddHandler client.UploadProgressChanged, AddressOf UploadProgressCallback
client.UploadFileAsync(uri, "POST", fileName)
Console.WriteLine("File upload started.")
End Sub
Im folgenden Codebeispiel wird eine Implementierung eines Handlers für dieses Ereignis gezeigt.
static void UploadProgressCallback(Object^ sender,
UploadProgressChangedEventArgs^ e)
{
// Displays the operation identifier, and the transfer progress.
Console::WriteLine("{0} uploaded {1} of {2} bytes. {3} % complete...",
(String ^)e->UserState,
e->BytesSent,
e->TotalBytesToSend,
e->ProgressPercentage);
}
static void DownloadProgressCallback(Object^ sender,
DownloadProgressChangedEventArgs^ e)
{
// Displays the operation identifier, and the transfer progress.
Console::WriteLine("{0} downloaded {1} of {2} bytes. {3} % complete...",
(String ^)e->UserState,
e->BytesReceived,
e->TotalBytesToReceive,
e->ProgressPercentage);
}
private static void UploadProgressCallback(object sender, UploadProgressChangedEventArgs e)
{
// Displays the operation identifier, and the transfer progress.
Console.WriteLine("{0} uploaded {1} of {2} bytes. {3} % complete...",
(string)e.UserState,
e.BytesSent,
e.TotalBytesToSend,
e.ProgressPercentage);
}
private static void DownloadProgressCallback(object sender, DownloadProgressChangedEventArgs e)
{
// Displays the operation identifier, and the transfer progress.
Console.WriteLine("{0} downloaded {1} of {2} bytes. {3} % complete...",
(string)e.UserState,
e.BytesReceived,
e.TotalBytesToReceive,
e.ProgressPercentage);
}
Private Shared Sub UploadProgressCallback(ByVal sender As Object, ByVal e As UploadProgressChangedEventArgs)
' Displays the operation identifier, and the transfer progress.
Console.WriteLine("{0} uploaded {1} of {2} bytes. {3} % complete...", _
CStr(e.UserState), e.BytesSent, e.TotalBytesToSend, e.ProgressPercentage)
End Sub
Private Shared Sub DownloadProgressCallback(ByVal sender As Object, ByVal e As DownloadProgressChangedEventArgs)
' Displays the operation identifier, and the transfer progress.
Console.WriteLine("{0} downloaded {1} of {2} bytes. {3} % complete...", _
CStr(e.UserState), e.BytesReceived, e.TotalBytesToReceive, e.ProgressPercentage)
End Sub
Hinweise
Dieses Ereignis wird jedes Mal ausgelöst, wenn ein asynchroner Upload Fortschritte macht. Dieses Ereignis wird ausgelöst, wenn Uploads mit einer der folgenden Methoden gestartet werden.
Methode | BESCHREIBUNG |
---|---|
UploadDataAsync | Sendet ein Byte Array an die Ressource, ohne den aufrufenden Thread zu blockieren. |
UploadFileAsync | Sendet eine lokale Datei an die Ressource, ohne den aufrufenden Thread zu blockieren. |
UploadValuesAsync | NameValueCollection Sendet eine an die Ressource und gibt ein Array zurück, das eine Byte Antwort enthält, ohne den aufrufenden Thread zu blockieren. |
Der UploadProgressChangedEventHandler Stellvertretung für dieses Ereignis. Die UploadProgressChangedEventArgs Klasse stellt den Ereignishandler mit Ereignisdaten bereit.
Weitere Informationen zum Behandeln von Ereignissen finden Sie unter behandeln und Auslösen von Ereignissen.