我想要的是,当某些方法正在执行某些任务时,UI 保持其自身处于活动状态,并且我想在进度栏中显示工作进度。
我有一个方法,一个
BackGroundWorker
和一个Progressbar
。我想在 BackGroundWorker
开始运行时调用该方法并显示进度。该方法包含一个循环。因此,它可以报告进度。
那么,可以做什么?
private void Form1_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'dataSet1.TBLMARKET' table. You can move, or remove it, as needed.
myBGWorker.WorkerReportsProgress = true;
}
private void myBGWorker_DoWork(object sender, DoWorkEventArgs e)
{
parseFiles();
}
private void myBGWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
myProgressBar.Value = e.ProgressPercentage;
}
private void myBGWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
MessageBox.Show("Done");
}
private void parseButton_Click(object sender, EventArgs e)
{
myBGWorker.RunWorkerAsync();
}
public void parseFiles()
{
for()
{
//parsing
myBGWorker.ReportProgress(...);
}
}
但是它不起作用。
Progressbar
未更新。 MessageBox
“完成”后仅显示出一小部分进展。
不要使用一种 ParseFiles 方法(这应该取决于 myBGWorker),而是使用解析一个文件的循环和方法。报告该循环中的进度百分比:
private void parseButton_Click(object sender, EventArgs e)
{
parseButton.Enabled = false;
myBGWorker.RunWorkerAsync();
}
private void myBGWorker_DoWork(object sender, DoWorkEventArgs e)
{
for(int i = 0; i < filesCount; i++)
{
ParseSingleFile(); // pass filename here
int percentage = (i + 1) * 100 / filesCount;
myBGWorker.ReportProgress(percentage);
}
}
void myBGWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
myProgressBar.Value = e.ProgressPercentage;
}
void myBGWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
parseButton.Enabled = true;
MessageBox.Show("Done");
}
到。索哈姆.m17 与发送者参数一起使用
private void myBGWorker_DoWork(object sender, DoWorkEventArgs e)
{
var worker = sender as BackgroundWorker;
for(int i = 0; i < filesCount; i++)
{
ParseSingleFile(); // pass filename here
int percentage = (i + 1) * 100 / filesCount;
worker.ReportProgress(percentage); // use not myBGWorker but worker from sender
}
}
实际上代码运行良好。它没有显示
Progressbar
,因为 myBGWorker.ReportProgress()
中的参数是分数而不是百分比。所以,它没有显示出来。