TaskbarItemInfo不显示不确定的ProgressState

问题描述

我举了一个简单的例子来说明我的问题。有一个窗口，其DataContext对应于MainWindowviewmodel类。该窗口包含带有按钮和ProgressBar的网格。 Button的命令受viewmodel的RelayCommand的支持，该命令首先执行从0到100的整数属性“ Percent”的增量。progressBar显示进度很好！该窗口包含TaskBarItemInfo属性，后者具有两个属性：MainValue在MainWindowviewmodel中，而ProgressValue则为double属性“ Count”，而Progressstate则为TaskbarItemProgressstate属性“ State”。 TaskbarItemInfo也显示从0到1的增量。

但是在初始方法的第二部分中，进度不确定5秒钟。虽然在progressBar中显示得很好，但在TaskBar中却没有。我既使用了从布尔值到TaskbarItemProgressstate的Converter到Progressstate属性的路径（IsIndeterminate），又使用了绑定到单独的属性State的方法，如下面的代码所示。

MainWindow.xaml

<Window x:Class="Progressstate.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Progressstate"
        mc:Ignorable="d"
        Title="MainWindow" Height="200" Width="400">
    <Window.DataContext>
        <local:MainWindowviewmodel/>
    </Window.DataContext>

    <Window.Resources>
        <local:BoolToProgressstateConverter x:Key="boolToProgressstateConverter"/>
    </Window.Resources>
    
    <Window.TaskbarItemInfo>
        <TaskbarItemInfo ProgressValue="{Binding Count,UpdateSourceTrigger=PropertyChanged,Mode=OneWay}"
                         Progressstate="{Binding State,Mode=OneWay}"/>
        <!--Progressstate="{Binding IsIndeterminate,Mode=OneWay,Converter={StaticResource boolToProgressstateConverter}}"-->
    </Window.TaskbarItemInfo>
    
    <Grid>
        <Grid.RowDeFinitions>
            <RowDeFinition/>
            <RowDeFinition/>
        </Grid.RowDeFinitions>
        <Button Content="Start progress" Grid.Row="0" Height="30" Width="100"
                Command="{Binding Start}" IsEnabled="{Binding IsEnabled,UpdateSourceTrigger=PropertyChanged}"/>
        <ProgressBar Grid.Row="1" Height="20" Margin="10 0"
                     Value="{Binding Percent,Mode=OneWay}"
                     IsIndeterminate="{Binding IsIndeterminate,Mode=OneWay}"/>
    </Grid>
</Window>

MainWindowviewmodel.cs

using galaSoft.MvvmLight;
using galaSoft.MvvmLight.CommandWpf;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Shell;

namespace Progressstate
{
    public class MainWindowviewmodel : viewmodelBase
    {
        private double count;
        private bool isIndeterminate;
        private int percent;
        private bool isEnabled = true;
        private TaskbarItemProgressstate state;

        public RelayCommand Start { get; set; }

        public MainWindowviewmodel()
        {
            Start = new RelayCommand(OnStart,CanStart);
        }

        public TaskbarItemProgressstate State
        {
            get
            {
                if (IsIndeterminate)
                {
                    state = TaskbarItemProgressstate.Indeterminate;
                }
                else
                {
                    state = TaskbarItemProgressstate.normal;
                }
                return state; 
            }
        }

        public bool IsEnabled
        {
            get
            {
                return isEnabled; 
            }
            set 
            {
                if (value != isEnabled)
                {
                    isEnabled = value;
                    RaisePropertyChanged(nameof(IsEnabled));
                }
            }
        }


        public bool IsIndeterminate
        {
            get 
            {
                return isIndeterminate; 
            }
            set
            {
                if (value != isIndeterminate)
                {
                    isIndeterminate = value;
                    RaisePropertyChanged(nameof(IsIndeterminate));
                    RaisePropertyChanged(nameof(State));
                }
            }
        }
        

        public int Percent
        {
            get
            {
                return percent; 
            }
            set
            {
                if (value != percent)
                {
                    percent = value;
                    RaisePropertyChanged(nameof(Percent));
                    RaisePropertyChanged(nameof(Count));
                }
            }
        }

        public double Count
        {
            get 
            {
                count = Percent / 100d;
                return count;
            }
        }


        private bool CanStart()
        {
            return true;
        }

        private async void OnStart()
        {
            IsEnabled = false;
            Percent = 0;
            
            await Task.Run(() =>
            {
                while (Percent != 100)
                {
                    Thread.Sleep(100);
                    Percent += 2;
                    
                }

                IsIndeterminate = true;
                Thread.Sleep(5000);
                IsIndeterminate = false;
            });

            IsEnabled = true;

        }
    }
}

BoolToProgressstateConverter.cs

using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Shell;

namespace Progressstate
{
    class BoolToProgressstateConverter : IValueConverter
    {
        public object Convert(object value,Type targettype,object parameter,CultureInfo culture)
        {
            if (value is bool boolean)
            {
                if (boolean == true)
                {
                    return TaskbarItemProgressstate.Indeterminate;
                }
                else if (boolean == false)
                {
                    return TaskbarItemProgressstate.normal;
                }
                else
                {
                    throw new NotImplementedException();
                }

            }
            return TaskbarItemProgressstate.normal;
        }

        public object ConvertBack(object value,CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

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解决方法

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