未调用UploadProgressChanged事件
未调用UploadProgressChanged事件
提问于 2012-12-04 05:46:03
我正在使用如下所示的UploadFilesAsync方法上传文件。
var wc = new WebClient();
Uri myUri = new Uri(uriString);
wc.UploadFileAsync(myUri, "POST", filePath);
wc.UploadProgressChanged += new UploadProgressChangedEventHandler(wc_UploadProgressChanged);
wc.UploadFileCompleted += new UploadFileCompletedEventHandler(wc_UploadFileCompleted);调用了我的UploadFileCompleted事件处理程序，但由于某些原因，从未调用过UploadProgressChanged事件处理程序。
你知道为什么吗？
回答 2
Stack Overflow用户
发布于 2012-12-04 05:54:49
更改：
wc.UploadFileAsync(myUri, "POST", filePath);
wc.UploadProgressChanged += new UploadProgressChangedEventHandler(wc_UploadProgressChanged);
wc.UploadFileCompleted += new UploadFileCompletedEventHandler(wc_UploadFileCompleted);适用于：
wc.UploadProgressChanged += new UploadProgressChangedEventHandler(wc_UploadProgressChanged);
wc.UploadFileCompleted += new UploadFileCompletedEventHandler(wc_UploadFileCompleted);
wc.UploadFileAsync(myUri, "POST", filePath);要在 UploadFileAsync调用后绑定事件处理程序，必须先绑定事件处理程序。
MSDN示例：
// Sample call: UploadFileInBackground2("http://www.contoso.com/fileUpload.aspx", "data.txt")
public static void UploadFileInBackground2 (string address, string fileName)
{
WebClient client = new WebClient ();
Uri uri = new Uri(address);
client.UploadFileCompleted += new UploadFileCompletedEventHandler (UploadFileCallback2);
// Specify a progress notification handler.
client.UploadProgressChanged += new UploadProgressChangedEventHandler(UploadProgressCallback);
client.UploadFileAsync (uri, "POST", fileName);
Console.WriteLine ("File upload started.");
}Stack Overflow用户
发布于 2012-12-04 06:02:38
您应该首先添加eventHandlers，然后调用将触发它们的方法。
wc.UploadProgressChanged += new UploadProgressChangedEventHandler(wc_UploadProgressChanged);
wc.UploadFileCompleted += new UploadFileCompletedEventHandler(wc_UploadFileCompleted);
wc.UploadFileAsync(myUri, "POST", filePath);页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/13692301
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