Question

我需要使用Image＆amp ;;显示启动画面进度条。

在我的应用程序启动时，我有以下代码来显示主窗口。

     SplashScreenWindowViewModel vm = new SplashScreenWindowViewModel(); 
     AutoResetEvent ev = new AutoResetEvent(false); 
      Thread uiThread = new Thread(() =>
     {
        vm.Dispatcher = Dispatcher.CurrentDispatcher;
        ev.Set();

        Dispatcher.CurrentDispatcher.BeginInvoke((Action)delegate()
        {
            SplashScreenWindow splashScreenWindow = new SplashScreenWindow();
            splashScreenWindow = new SplashScreenWindow();
            splashScreenWindow.Show();
            splashScreenWindow.DataContext = vm;
            vm.InstigateWorkCommand.Execute(null);

        });

        Dispatcher.Run();
    });
      uiThread.SetApartmentState(ApartmentState.STA);
      uiThread.IsBackground = true;
      uiThread.Start();
      ev.WaitOne();

在我的主视图模型中，我的代码如下

类MainviewModel：viewmodelbase { rivate string _message; 私人对象内容; 私人只读BackgroundWorker工作者; 私人只读ICommand instigateWorkCommand;

    public SplashScreenWindowViewModel()
    {

        this.instigateWorkCommand = new
         RelayCommand(() => this.worker.RunWorkerAsync(), () => !this.worker.IsBusy);
        this.worker = new BackgroundWorker { WorkerReportsProgress = true };           
        this.worker.DoWork += this.DoWork;
        this.worker.ProgressChanged += this.ProgressChanged;
        _message = "0 % completed";

    }



    public ICommand InstigateWorkCommand
    {

        get { return this.instigateWorkCommand; }
    }

    private double _currentProgress;
    public double CurrentProgress        
    {
        get { return this._currentProgress; }
        set
        {
            if (this._currentProgress != value)
            {

                this._currentProgress = value;                   
                RaisePropertyChanged("CurrentProgress");
            }
        }
    }
    private int _progressMax;
    public int ProgressMax
    {
        get { return this._progressMax; }

        set
        {
            if(this._progressMax != value)
            {
              this._progressMax = value;
              RaisePropertyChanged("ProgressMax");
            }

        }
    }

    private void ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
      this.CurrentProgress = e.ProgressPercentage;


    }

    private void DoWork(object sender, DoWorkEventArgs e)
    {

       // calling my long running operation
       DAL.dotimeconsumingcode();
       worker.ReportProgress((int)e.argument);

    }




    public string Message
    {
        get
        {
            return _message;
        }
        set
        {
            if (Message == value) return;
            _message = value;
            RaisePropertyChanged("Message");
        }
    }


    public object Content
    {
        get
        {
            return content;
        }
        set
        {
            if (Content == value) return;
            content = value;

            RaisePropertyChanged("Content");
        }
    }

    public Dispatcher Dispatcher
    {
        get;
        set;
    }

}

我的UI有一个用户控件，带有进度条和一个启动主窗口。当我的长时间运行操作完成后，我的主窗口（主应用程序）被打开。 //用户控制

        <ProgressBar Height="27" Value="{Binding CurrentProgress, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"  Margin="53,162,57,0" Name="progressBar"  Grid.Row="1"
             Maximum="{Binding Path=ProgressMax, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"    Visibility="{Binding ProgressVisibility}"  />

// SplashWindow

  <localView:usercontrol/>

我的问题是

ProgressChangedevent未触发，％完成也未显示在文本块中。请帮忙

Answer 1

您尚未注册完整的处理程序，并且未正确调用进度。来自MSDN的此示例涵盖了所有内容。

BackGroundWorker

Show Splash Screen＆amp;使用MVVM和＆amp ;;进度条的百分比WPF

1 个答案: