进度条从 0% 跳到 100%，中间不更新

Question

我正在实现一个 ProgressBar，它在每个完成的任务（总共 5 个任务）后更新。它应该在每个完成的任务后更新 20%。单击按钮会启动运行任务，但是当单击按钮时，进度条会从 0% 变为 100%，中间不会更新。 Thread.Sleep(1000) 添加在进度值的每个增量之前，以模拟每个任务将花费的时间。在为每个任务添加代码之前，我想让进度条正常工作。

我已经尝试添加 AvaloniaPropertyChanged 事件，但它似乎并没有改变问题。

MainWindow.xaml:

<ProgressBar Name="RunProgress" Value="{Binding Progress}" IsIndeterminate="False" Minimum="0" Maximum="100" Height="30"/>
<TextBlock Text="{Binding ElementName=RunProgress, Path=Value, StringFormat={}{0:0}%}" HorizontalAlignment="Center" VerticalAlignment="Center" />

MainWindow.xaml.cs:

//boolean variables for whether or not that process is completed (false if not done, true if done)
bool MasterLimitsRead = false;
bool MasterOrganized = false;
bool LimitsOrganized = false;
bool RemovedFailed = false;
bool OutputCreated = false;

//holds descriptions of the 5(+1) operations the program runs through including description for Done
string[] operation =
{
   "Reading the master and limits file text",
   "Organizing the master data",
   "Organizing the limits",
   "Identifying and removing failed devices",
   "Creating the output",
   "Done"
};

context.CurrentOp = operation[0];

Thread.Sleep(1000);
MasterLimitsRead = true;
if(MasterLimitsRead == true)
{
   context.Progress += 20;
   context.CurrentOp = operation[1];
}

Thread.Sleep(1000);
MasterOrganized = true;
if(MasterOrganized == true)
{
   context.Progress += 20;
   context.CurrentOp = operation[2];
}

Thread.Sleep(1000);
LimitsOrganized = true;
if(LimitsOrganized == true)
{
   context.Progress += 20;
   context.CurrentOp = operation[3];
}

Thread.Sleep(1000);
RemovedFailed = true;
if(RemovedFailed == true)
{
   context.Progress += 20;
   context.CurrentOp = operation[4];
}

Thread.Sleep(1000);
OutputCreated= true;
if(OutputCreated== true)
{
   context.Progress += 20;
   context.CurrentOp = operation[5];
}

MainWindowViewModel.cs:

private string currentOp = string.Empty;   //variable to store current operation, initialized to empty string
public string CurrentOp
{
   get => currentOp;
   set
   {
      if (value != currentOp)
      {
         currentOp = value;
         OnPropertyChanged();
      }
    }
}

private string progress = 0;   //variable to store ProgressBar value in percent, initialized to 0
public string CurrentOp
{
   get => currentOp;
   set
   {
      if (value != currentOp)
      {
         currentOp = value;
         OnPropertyChanged();
      }
    }
}

public event PropertyChangedEventHandler PropertyChanged;

protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
   if(PropertyChanged != null)
   {
      PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
   }
}

预期：进度条应在每个任务完成后从 0% 增加到 100%，增加 20%（由 Thread.Sleep(1000) 延迟 1 秒模拟）

实际：进度条从 0% 开始，然后在单击按钮时暂停 UI 交互 5 秒，然后将进度条更新为 100%。我希望它在进度条的每次增量值时更新。

Answer 1

通过调用 Sleep，您将阻塞 UI 线程。如果 UI 线程被阻塞，将不会有任何 UI 更新。要模拟 long-running 任务，请改用 await Task.Delay(TimeSpan.FromSeconds(1))。

进度条从 0% 跳到 100%，中间不更新

Progress bar skips from 0% to 100% without updating in between

inotifypropertychanged

progress-bar

avaloniaui