UploadStringCompletedEventHandler 委托
重要
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表示将用来处理 UploadStringCompleted 的 WebClient 事件的方法。
public delegate void UploadStringCompletedEventHandler(System::Object ^ sender, UploadStringCompletedEventArgs ^ e);C#
public delegate void UploadStringCompletedEventHandler(object sender, UploadStringCompletedEventArgs e);type UploadStringCompletedEventHandler = delegate of obj * UploadStringCompletedEventArgs -> unitPublic Delegate Sub UploadStringCompletedEventHandler(sender As Object, e As UploadStringCompletedEventArgs)- sender
- Object
事件源。
下面的代码示例演示如何异步上传字符串。
void UploadStringInBackground2( String^ address )
{
WebClient^ client = gcnew WebClient;
Uri ^uri = gcnew Uri(address);
String^ data = "Time = 12:00am temperature = 50";
client->UploadStringCompleted += gcnew UploadStringCompletedEventHandler( UploadStringCallback2 );
client->UploadStringAsync( uri, data );
}
C#
public static void UploadStringInBackground2(string address)
{
WebClient client = new WebClient();
Uri uri = new Uri(address);
string data = "Time = 12:00am temperature = 50";
client.UploadStringCompleted += new UploadStringCompletedEventHandler(UploadStringCallback2);
client.UploadStringAsync(uri, data);
}
Public Shared Sub UploadStringInBackground2(ByVal address As String)
Dim client As WebClient = New WebClient()
Dim data As String = "Time = 12:00am temperature = 50"
AddHandler client.UploadStringCompleted, AddressOf UploadStringCallback2
Dim uri as Uri = New Uri(address)
client.UploadStringAsync(uri, data)
End Sub
上传完成后，将调用以下方法。
void UploadStringCallback2( Object^ /*sender*/, UploadStringCompletedEventArgs^ e )
{
String^ reply = dynamic_cast<String^>(e->Result);
Console::WriteLine( reply );
}
C#
private static void UploadStringCallback2(Object sender, UploadStringCompletedEventArgs e)
{
string reply = (string)e.Result;
Console.WriteLine(reply);
}
Private Shared Sub UploadStringCallback2(ByVal sender As Object, ByVal e As UploadStringCompletedEventArgs)
Dim reply As String = CStr(e.Result)
Console.WriteLine(reply)
End Sub
创建 UploadStringCompletedEventHandler 委托时，需要标识将处理该事件的方法。 若要将事件与事件处理程序关联，请将该委托的一个实例添加到事件中。 除非移除了该委托，否则每当发生该事件时就会调用事件处理程序。 有关事件处理程序委托的详细信息，请参阅 处理和引发事件。
|
Get |
获取指示指定委托表示的方法的对象。 |
| 产品 | 版本 |
|---|---|
| .NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10 |
| .NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 2.0, 2.1 |
