UploadStringCompletedEventHandler 委托

定义

表示将用来处理 UploadStringCompletedWebClient 事件的方法。

public delegate void UploadStringCompletedEventHandler(System::Object ^ sender, UploadStringCompletedEventArgs ^ e);
public delegate void UploadStringCompletedEventHandler(object sender, UploadStringCompletedEventArgs e);
type UploadStringCompletedEventHandler = delegate of obj * UploadStringCompletedEventArgs -> unit
Public Delegate Sub UploadStringCompletedEventHandler(sender As Object, e As UploadStringCompletedEventArgs)

参数

sender
Object

事件源。

示例

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 );
}
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 );
}
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

注解

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

扩展方法

GetMethodInfo(Delegate)

获取指示指定委托表示的方法的对象。

适用于