这是一个如何做到这一点的例子。
public int ProgressBarPercentage { get; set; }
public string StatusMessage { get; set; }
public void StartDownload()
{
BackgroundWorker bw = new BackgroundWorker();
bw.WorkerReportsProgress = true;
bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
bw.DoWork += new DoWorkEventHandler(bw_DoWork);
bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
bw.RunWorkerAsync();
}
void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
// Run clean up code here once complete (ie make sure progress bar is at 100 percent....
}
void bw_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker bw = sender as BackgroundWorker;
// Download files here
List<string> filestoget = new List<string>();
filestoget.Add("File1");
filestoget.Add("File2");
filestoget.Add("File3");
filestoget.Add("File4");
filestoget.Add("File5");
foreach (string file in filestoget)
{
// Get File
// Report output
int progress = 0; // add soemthing here to calculate your progress
bw.ReportProgress(progress, string.Format("File {0} downloaded", file));
}
}
void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
ProgressBarPercentage = e.ProgressPercentage;
StatusMessage = e.UserState.ToString();
}
u能请给我提供somecode,因为我不知道进度条,我刚才看到它 –
这是不正确。如果他在后台执行此操作(不同的线程),则只要使用BeginInvoke或BackGroundWorker进度更改事件将值传递给UI,UI就会更新。 – tsells