2023年7月19日发(作者：)

WPF中ProgressBar的使⽤第⼀次在WPF中使⽤进度条，界⾯是⽤的xml。运⽤BackgroundWorker实现进度条变化。通过前台输⼊数据，在界⾯内画正⽅形。代码如下： 1 private static BackgroundWorker backgroundWorker; 2

3 //窗体加载时进⾏的⼯作。 4

5 private void Window_Loaded(object sender, RoutedEventArgs e) 6 { 7 backgroundWorker = new BackgroundWorker(); 8 ReportsProgress = true; 9 SupportsCancellation = true; //⽀持异步取消操作10 += backgroundWorker_DoWork; //发⽣时kerAsync()调⽤11 ssChanged += backgroundWorker_ProgressChanged;12 kerCompleted += backgroundWorkerDownloader_RunWorkerCompleted;13 }14

15 //后台操作任务，⽆法获取前台数据。不在⼀个线程16 void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)17 {18 for (int i = 0; i < ((int)nt); i++)19 {20 Progress(i);21

22 //数据传输之间暂停的时间，10ms，数据传输过快⽽图形没有画完可能会造成进度条不显⽰23 (10);

24 //(sender as BackgroundWorker).ReportProgress(i);25 }26 }27

28 public static double lng = 110.00, lat = -35.00;//经度，纬度29 double a = 0.01;30

31 //需要前台数据的操作写在ProgressChanged中32

33 void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)34 {35 t = ssPercentage;36 = ssPercentage;37

38 //在界⾯内画正⽅形39

40 DrawZFX(e);41

42 }43

44 private void DrawZFX(ProgressChangedEventArgs e)45

46 {47 var i = ssPercentage;48 lat = ((lat - a), 2);49 = (lng + a * i).ToString();50 = (lat + a * i).ToString();51 AppendGeometryPoint(true); //在界⾯内添加起始点52

53 = ((lng + a * i) + a).ToString();54 = (lat + a * i).ToString();55 AppendGeometryPoint(false);

56

57 = ((lng + a * i) + a).ToString();58 = ((lat + a * i) + a).ToString();59 AppendGeometryPoint(false);60

61 = (lng + a * i).ToString();62 = ((lat + a * i) + a).ToString();63 AppendGeometryPoint(false);64 }65

66 void backgroundWorkerDownloader_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)67 {68 lity = ;69 }