使用带有 MVVM 模式的 WPF 实现进度条（无 BackgroundWorker）

Question

I have a WPF application which is built on the MVVM design pattern.

I wish to implement a progress bar in the app, that follows the MVVM pattern.

I found some solutions to implement this using background-worker class. For some reasons i am not allowable to use background worker.

Does any one have any suggestions on how to implement this?

Thanks in advance

Answer 1

I would prefer Task over background workers. Anyway, here's a simple implementation of progress bar.

<ProgressBar Value="{Binding ProgressValue}" Maximum="100" Height="20" />

public MainViewModel()
{
    Task.Run(() =>
        {
            while (true)
            {
                ProgressValue++;
                Thread.Sleep(250);
            }
        });
    }

    public int ProgressValue
    {
        get { return _progressValue; }
        set { _progressValue = value; OnPropertyChanged(); }
    }
}

Answer 2

The basics are very simple.

View:

 <ProgressBar Value="{Binding ProgressValue}" />

ViewModel:

 public double ProgressValue { get/set with INPC }

But the remaining challenge is to set the ViewModels ProgressValue from a non-blocking process in a thread-safe manner.

Your question lacks the details to help with that.