UploadStringAsync的返回值（）。？ [英] Return value of UploadStringAsync().?

问题描述

我的问题是正确或不正确的，我不知道，但我想知道是否有可能重返岗位方法UploadStringAsync（）使用Web客户端的价值？

My question is correct or incorrect I don't know, but I would like to know if is it possible to return the value of UploadStringAsync() of post methods using WebClient?

    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 ??;

如果我们能回到的值UploadStringAsync（URI，HTTP_POST，结果）; 请让我知道

If we can return the value of UploadStringAsync(URI, HTTP_POST, result); please let me know?

推荐答案

您可以使用<一个href="http://msdn.microsoft.com/en-us/library/system.net.webclient.uploadstringcompleted%28v=vs.110%29.aspx"相对=nofollow> UploadStringCompleted 事件，并获得导致事件处理程序。一旦上传完成（失败或成功）事件出现。

You can use UploadStringCompleted event and get result in event handler. Once upload completes (failed or succeed) event is raised.

连接

client.UploadStringCompleted 
               += new UploadStringCompletedEventHandler (UploadStringCallback2);

使用：

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

如果你想返回上传您可以等待事件的结果，在这里提出类似  使用的AutoResetEvent

If you want to return result of the upload you can wait for event to be raised like here using AutoResetEvent

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