OpenReadCompletedEventHandler 委托
定义
表示将用来处理 OpenReadCompleted 的 WebClient 事件的方法。Represents the method that will handle the OpenReadCompleted event of a WebClient.
public delegate void OpenReadCompletedEventHandler(System::Object ^ sender, OpenReadCompletedEventArgs ^ e);
public delegate void OpenReadCompletedEventHandler(object sender, OpenReadCompletedEventArgs e);
type OpenReadCompletedEventHandler = delegate of obj * OpenReadCompletedEventArgs -> unit
Public Delegate Sub OpenReadCompletedEventHandler(sender As Object, e As OpenReadCompletedEventArgs)
参数
- sender
- Object
事件源。The source of the event.
一个包含事件数据的 OpenReadCompletedEventArgs。A OpenReadCompletedEventArgs containing event data.
示例
下面的代码示例演示如何下载资源以进行读取。The following code example demonstrates downloading a resource for reading.
void OpenResourceForReading2( String^ address )
{
WebClient^ client = gcnew WebClient;
Uri ^uri = gcnew Uri(address);
client->OpenReadCompleted += gcnew OpenReadCompletedEventHandler( OpenReadCallback2 );
client->OpenReadAsync( uri );
}
public static void OpenResourceForReading2(string address)
{
WebClient client = new WebClient();
Uri uri = new Uri(address);
client.OpenReadCompleted += new OpenReadCompletedEventHandler(OpenReadCallback2);
client.OpenReadAsync(uri);
}
Public Shared Sub OpenResourceForReading2(ByVal address As String)
Dim client As WebClient = New WebClient()
AddHandler client.OpenReadCompleted, AddressOf OpenReadCallback2
Dim uri as Uri = New Uri(address)
client.OpenReadAsync(uri)
End Sub
下载完成时,将调用以下方法。The following method is called when the download completes.
void OpenReadCallback2( Object^ /*sender*/, OpenReadCompletedEventArgs^ e )
{
Stream^ reply = nullptr;
StreamReader^ s = nullptr;
try
{
reply = dynamic_cast<Stream^>(e->Result);
s = gcnew StreamReader( reply );
Console::WriteLine( s->ReadToEnd() );
}
finally
{
if ( s != nullptr )
{
s->Close();
}
if ( reply != nullptr )
{
reply->Close();
}
}
}
private static void OpenReadCallback2(Object sender, OpenReadCompletedEventArgs e)
{
Stream reply = null;
StreamReader s = null;
try
{
reply = (Stream)e.Result;
s = new StreamReader(reply);
Console.WriteLine(s.ReadToEnd());
}
finally
{
if (s != null)
{
s.Close();
}
if (reply != null)
{
reply.Close();
}
}
}
Private Shared Sub OpenReadCallback2(ByVal sender As Object, ByVal e As OpenReadCompletedEventArgs)
Dim reply As Stream = Nothing
Dim s As StreamReader = Nothing
Try
reply = CType(e.Result, Stream)
s = New StreamReader(reply)
Console.WriteLine(s.ReadToEnd())
Finally
If Not s Is Nothing Then
s.Close()
End If
If Not reply Is Nothing Then
reply.Close()
End If
End Try
End Sub
注解
创建 OpenReadCompletedEventHandler 委托时,需要标识将处理该事件的方法。When you create a OpenReadCompletedEventHandler delegate, you identify the method that will handle the event. 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。To associate the event with your event handler, add an instance of the delegate to the event. 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。The event handler is called whenever the event occurs, unless you remove the delegate.
扩展方法
| GetMethodInfo(Delegate) |
获取指示指定委托表示的方法的对象。Gets an object that represents the method represented by the specified delegate. |