WebClient.UploadDataCompleted 事件
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
异步数据上传操作完成时发生。
public:
event System::Net::UploadDataCompletedEventHandler ^ UploadDataCompleted;public event System.Net.UploadDataCompletedEventHandler? UploadDataCompleted;public event System.Net.UploadDataCompletedEventHandler UploadDataCompleted;member this.UploadDataCompleted : System.Net.UploadDataCompletedEventHandler Public Custom Event UploadDataCompleted As UploadDataCompletedEventHandler Public Event UploadDataCompleted As UploadDataCompletedEventHandler 事件类型
示例
下面的代码示例演示如何为此事件设置事件处理程序。
void UploadDataInBackground3( String^ address )
{
WebClient^ client = gcnew WebClient;
Uri ^uri = gcnew Uri(address);
String^ text = "Time = 12:00am temperature = 50";
array<Byte>^data = System::Text::Encoding::UTF8->GetBytes( text );
client->UploadDataCompleted += gcnew UploadDataCompletedEventHandler( UploadDataCallback3 );
client->UploadDataAsync( uri, data );
}
public static void UploadDataInBackground3(string address)
{
WebClient client = new WebClient();
Uri uri = new Uri(address);
string text = "Time = 12:00am temperature = 50";
byte[] data = System.Text.Encoding.UTF8.GetBytes(text);
client.UploadDataCompleted += new UploadDataCompletedEventHandler(UploadDataCallback3);
client.UploadDataAsync(uri, data);
}
Public Shared Sub UploadDataInBackground3(ByVal address As String)
Dim client As WebClient = New WebClient()
Dim text As String = "Time = 12:00am temperature = 50"
Dim data() As Byte = System.Text.Encoding.UTF8.GetBytes(text)
AddHandler client.UploadDataCompleted, AddressOf UploadDataCallback3
Dim uri as Uri = New Uri(address)
client.UploadDataAsync(uri, data)
End Sub
下面的代码示例演示此事件的处理程序的实现。
void UploadDataCallback3( Object^ /*sender*/, UploadDataCompletedEventArgs^ e )
{
array<Byte>^data = dynamic_cast<array<Byte>^>(e->Result);
String^ reply = System::Text::Encoding::UTF8->GetString( data );
Console::WriteLine( reply );
}
private static void UploadDataCallback3(Object sender, UploadDataCompletedEventArgs e)
{
byte[] data = (byte[])e.Result;
string reply = System.Text.Encoding.UTF8.GetString(data);
Console.WriteLine(reply);
}
Private Shared Sub UploadDataCallback3(ByVal sender As Object, ByVal e As UploadDataCompletedEventArgs)
Dim data() As Byte = CType(e.Result, Byte())
Dim reply As String = System.Text.Encoding.UTF8.GetString(data)
Console.WriteLine(reply)
End Sub
注解
谨慎
WebRequest、HttpWebRequest、ServicePoint和 WebClient 已过时，不应将其用于新开发。 请改用 HttpClient。
每次异步数据上传操作完成时都会引发此事件。 异步数据上传是通过调用 UploadDataAsync 方法启动的。
UploadDataCompletedEventHandler 是此事件的委托。 UploadDataCompletedEventArgs 类为事件处理程序提供事件数据。
有关如何处理事件的详细信息，请参阅 处理和引发事件。
