WebClient.UploadStringCompleted 事件
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。
异步字符串上传操作完成时发生。
public:
event System::Net::UploadStringCompletedEventHandler ^ UploadStringCompleted;public event System.Net.UploadStringCompletedEventHandler? UploadStringCompleted;public event System.Net.UploadStringCompletedEventHandler UploadStringCompleted;member this.UploadStringCompleted : System.Net.UploadStringCompletedEventHandler Public Custom Event UploadStringCompleted As UploadStringCompletedEventHandler Public Event UploadStringCompleted As UploadStringCompletedEventHandler 下面的代码示例演示如何为此事件设置事件处理程序。
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
下面的代码示例演示此事件的处理程序的实现。
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
注意
WebRequest、HttpWebRequest、ServicePoint和 WebClient 已过时，不应将其用于新开发。 请改用 HttpClient。
每次异步字符串上传操作完成时都会引发此事件。 异步字符串上传是通过调用 UploadStringAsync 方法启动的。
UploadStringCompletedEventHandler 是此事件的委托。 UploadStringCompletedEventArgs 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。
| 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 |
