WebClient.UploadProgressChanged Événement
Définition
Important
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Se produit lorsqu'une opération de transfert asynchrone transmet avec succès une partie ou l'ensemble des données.
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
Type d'événement
Exemples
L’exemple de code suivant illustre la définition d’un gestionnaire d’événements pour cet événement.
// 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
L’exemple de code suivant montre une implémentation d’un gestionnaire pour cet événement.
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
Remarques
Cet événement est déclenché chaque fois qu’un chargement asynchrone progresse. Cet événement est déclenché lorsque les chargements sont démarrés à l’aide de l’une des méthodes suivantes.
Méthode | Description |
---|---|
UploadDataAsync | Envoie un Byte tableau à la ressource, sans bloquer le thread appelant. |
UploadFileAsync | Envoie un fichier local à la ressource, sans bloquer le thread appelant. |
UploadValuesAsync | Envoie un NameValueCollection à la ressource et retourne un Byte tableau contenant une réponse, sans bloquer le thread appelant. |
UploadProgressChangedEventHandler est le délégué de cet événement. La UploadProgressChangedEventArgs classe fournit au gestionnaire d’événements des données d’événement.
Pour plus d’informations sur la façon de gérer les événements, consultez gestion et déclenchement d’événements.
S’applique à
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