WPF中ProgressBar的使用

第一次在WPF中使用進度條，界面是用的xml。運用BackgroundWorker實現進度條變化。

通過前台輸入數據，在界面內畫正方形。

代碼如下：

 private static BackgroundWorker backgroundWorker;
 
 //窗體加載時進行的工作。
 
 private void Window_Loaded(object sender, RoutedEventArgs e)
 {
 backgroundWorker = new BackgroundWorker();
 backgroundWorker.WorkerReportsProgress = true;
 backgroundWorker.WorkerSupportsCancellation = true;   //支持異步取消操作
 backgroundWorker.DoWork += backgroundWorker_DoWork;     //發生時BachgroundWorker.RunWorkerAsync()調用
 backgroundWorker.ProgressChanged += backgroundWorker_ProgressChanged;
 backgroundWorker.RunWorkerCompleted += backgroundWorkerDownloader_RunWorkerCompleted;
 }
 
 //后台操作任務，無法獲取前台數據。不在一個線程
 void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
 {
 for (int i = 0; i < ((int)e.Argument); i++)
 {
 backgroundWorker.ReportProgress(i);
 
 //數據傳輸之間暫停的時間，10ms，數據傳輸過快而圖形沒有畫完可能會造成進度條不顯示
 Thread.Sleep(10); 
 //(sender as BackgroundWorker).ReportProgress(i);
 }
 }
 
 public static double lng = 110.00, lat = -35.00;//經度，緯度
 double a = 0.01;
 
 //需要前台數據的操作寫在ProgressChanged中
 
 void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
 {
 DrawNumber.Content = e.ProgressPercentage;
 DrawProgressBar.Value = e.ProgressPercentage;
 
 //在界面內畫正方形
 
 DrawZFX(e);
 
 }
 
 private void DrawZFX(ProgressChangedEventArgs e)
 
 {
 var i = e.ProgressPercentage;
 lat = Math.Round((lat - a), 2);
 TBLngValue.Text = (lng + a * i).ToString();
 TBLatValue.Text = (lat + a * i).ToString();
 AppendGeometryPoint(true);  //在界面內添加起始點
 
 TBLngValue.Text = ((lng + a * i) + a).ToString();
 TBLatValue.Text = (lat + a * i).ToString();
 AppendGeometryPoint(false); 
 
 TBLngValue.Text = ((lng + a * i) + a).ToString();
 TBLatValue.Text = ((lat + a * i) + a).ToString();
 AppendGeometryPoint(false);
 
 TBLngValue.Text = (lng + a * i).ToString();
 TBLatValue.Text = ((lat + a * i) + a).ToString();
 AppendGeometryPoint(false);
 }
 
 void backgroundWorkerDownloader_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
 {
    DrawProgressBar.Visibility = Visibility.Hidden;
 }