需要使用webclient报告进度 [英] Need to report progress using webclient
问题描述
应用程序异步下载多个文件，所以当我输入10个链接到列表框10个文件开始下载。我想为每个文件动态创建进度条并报告进度。这就是我用来报告进度的内容
The app downloading multiple files asynchronously, so when i enter 10 links into listbox 10 files start to download. I wast to create progress bars dynamically for every file and report progress. This is what im using to report progress
client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(worker_ProgressChanged);但它无效。
当我做
but its not working.
When i do
worker.ReportProgress(10);
它有效，但我只能报告一个整数，而不是client.DownloadProgressChanged。
我的问题是如何将client.DownloadProgressChanged附加到我的worker_ProgressChanged类。
我尝试过：
private void backgroundWorker1_DoWork（object sender，DoWorkEventArgs e）
{
List< string> myList =（List< string>）e.Argument;
foreach（myList中的字符串yo）
{
ProgressBar bar = new ProgressBar（）;
位置+ = 30;
bar.Width = 300;
bar.Location = new Point（300，position）;
Invoke（new ToDoDelegate（（）=> bar.Location = new Point（150， position）））;
Invoke（new ToDoDelegate（（）=> this.Controls.Add（bar）））;
Invoke（new ToDoDelegate（（）= > bar.Visible = true））;
WebClient客户端=新WebClient（）;
string FileName = yo.Substring（yo.LastIndexOf（/）+ 1，（yo.Length - yo.LastIndexOf（/） - 1））;
client.DownloadFileAsync（new Uri（yo），C：\\Test4 \\+ FileName）;
client.DownloadProgressChanged + = new DownloadProgressChangedEventHandler（worker_ProgressChanged）;
//（发件人为BackgroundWorker）.ReportProgress（（client.DownloadFileAsync（new Uri（yo），FileName）））;
worker.ReportProgress（10）;
}
}
private void worker_ProgressChanged（object sender，ProgressChangedEventArgs e）
{< br $>
MessageBox.Show（我正在报告）;
}
it works but im can only report an integer and not client.DownloadProgressChanged.
My question is how do i attach client.DownloadProgressChanged to my worker_ProgressChanged class.
What I have tried:
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
List<string> myList = (List<string>)e.Argument;
foreach(string yo in myList)
{
ProgressBar bar = new ProgressBar();
position += 30;
bar.Width = 300;
bar.Location = new Point(300, position);
Invoke(new ToDoDelegate(() => bar.Location = new Point(150, position)));
Invoke(new ToDoDelegate(() => this.Controls.Add(bar)));
Invoke(new ToDoDelegate(() => bar.Visible = true));
WebClient client = new WebClient();
string FileName = yo.Substring(yo.LastIndexOf("/") + 1, (yo.Length - yo.LastIndexOf("/") - 1));
client.DownloadFileAsync(new Uri(yo), "C:\\Test4\\" + FileName);
client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(worker_ProgressChanged);
// (sender as BackgroundWorker).ReportProgress((client.DownloadFileAsync( new Uri(yo), FileName)));
worker.ReportProgress(10);
}
}
private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
MessageBox.Show("I am reporting");
}
推荐答案
以下代码将对您有所帮助：
The following code will help you:
WebClient webClient = new WebClient();
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(DownloadFileCompleted);
webClient.QueryString.Add("file", localFilePath); // To identify the file
webClient.DownloadFileAsync("URL here", localFilePath);
webClient_DownloadProgressChanged 事件将如下所示：
And the webClient_DownloadProgressChanged event will be like the following:
void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
string fileProcessed = ((System.Net.WebClient)(sender)).QueryString["file"]; // Getting the local path if required
var RecevedBytes = e.BytesReceived;
var TotalBytes = e.TotalBytesToReceive;
// use these variables if needed
bar.Value = e.ProgressPercentage;
}
这篇关于需要使用webclient报告进度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
