c# - UploadStringAsync() 的返回值。？

Question

我不知道我的问题是否正确，但我想知道是否可以使用 WebClient 返回 post 方法的 UploadStringAsync() 值？

    string serviceURL = REST_URI + servicePath;
    Uri URI = new Uri(serviceURL);
    System.Net.WebClient webClient = new WebClient();
    webClient.Headers["ContentType"] = "application/json";
    webClient.Headers["Accept"] = "application/json";
    webClient.UploadStringCompleted += this.sendPostCompleted;
    webClient.UploadStringAsync(URI, HTTP_POST, result);
    return ??;

如果我们可以返回 UploadStringAsync(URI, HTTP_POST, result); 的值，请告诉我？

Answer 1

您可以使用 UploadStringCompleted事件并在事件处理程序中获取结果。一旦上传完成(失败或成功)，就会引发事件。

附加

client.UploadStringCompleted 
               += new UploadStringCompletedEventHandler (UploadStringCallback2);

使用:

void UploadStringCallback2(object sender, UploadStringCompletedEventArgs e)
{
//e.Result use it
}

如果你想返回上传的结果，你可以等待像here这样的事件被引发。 使用 AutoResetEvent