Question

我有一个包含少量TextBox元素和进度条的表单。我希望在TextBox分配了一些值时更新进度条。

我注意到在WPF中这可以使用BackgroundWorker来实现，但这在WinRT中不存在

XAML：

<StackPanel>
    <ProgressBar x:Name="progressBar1" 
                 Value="{Binding ProgressPercent}"  
                 HorizontalAlignment="Left" 
                 IsIndeterminate="False" 
                 Maximum="100" />

    <TextBlock Text="Name" Grid.Column="0"/>
    <TextBox x:Name="NameTextBox" Text="{Binding Name, Mode=TwoWay}"/>

    <TextBlock Text="Data" Grid.Row="1" Grid.Column="0"/>
    <DatePicker Date="{Binding Data, Mode=TwoWay}" 
                HorizontalAlignment="Stretch" 
                VerticalAlignment="Center" 
                Grid.Row="1" 
                Grid.Column="1" 
                CalendarIdentifier="GregorianCalendar" 
                Margin="0,8" />

    <TextBlock Text="Address" Grid.Row="2" Grid.Column="0"/>
    <TextBox x:Name="AddressTextBox" 
             Text="{Binding Address, Mode=TwoWay}" 
             Grid.Row="2" 
             Grid.Column="1" 
             Margin="0,5" />

    <TextBlock Text="Email" Grid.Row="3" Grid.Column="0"/>
    <TextBox x:Name="EmailTextBox" 
             Text="{Binding Email, Mode=TwoWay}" 
             Grid.Row="3" 
             Grid.Column="1" 
             Margin="0,5" />
</StackPanel>

视图模型：

#region fields

private string progressPercent {get;set;}

#endregion

#region proprietes
 public int ProgressPercent
    {
        get
        {
            return this.progressPercent;
        }
        set
        {
            this.progressPercent = value;
            this.RaisePropertyChanged(() => this.ProgressPercent);
        }
    }
#endregion

如何在WinRT中实现这一目标？不幸的是，大多数例子都是针对Wpf的

Answer 1

每次更新表单的某个字段时，需要将百分比值添加到ProgressPercent属性中，我不会看到需要异步代码，但如果您在此处坚持如何这样做

 private string _name = "";
    public string Name
    {
        get
        {
            return _name;
        }

        set
        {
            if (_name == value)
            {
                return;
            }
            _name = value;
            OnPropertyChanged();
            Window.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
            {
                ProgressPercent += 10; //handle the fact that this needs to be added once using a bool or something 
            });

        }
    }

Answer 2

您错过了INotifyPropertyChanged。如果没有这个，进度条不会从ViewModel获取更新的值，也不会显示任何进度。

您可以阅读更多INotifyPropertyChanged here.

如何根据WinRT中的表单更新进度条？

2 个答案: