我正在开发Windows Phone 8.1应用程序，我需要圆形的progressbar。
我有此用户控制代码：
<UserControl.Resources>
<Style TargetType="ProgressBar" x:Key="CircularProgressBarStyle">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ProgressBar">
<Grid x:Name="LayoutRoot">
<local:CircularProgressBarViewModel.Attach>
<local:CircularProgressBarViewModel HoleSizeFactor="0.75"/>
</local:CircularProgressBarViewModel.Attach>
<Ellipse Width="{Binding Diameter}" Height="{Binding Diameter}"
HorizontalAlignment="Center" VerticalAlignment="Center"
Stroke="LightGray" Opacity="0.5" Fill="Transparent"
StrokeThickness="10">
</Ellipse>
<local:PiePiece CentreX="{Binding CentreX}" CentreY="{Binding CentreY}"
RotationAngle="0" WedgeAngle="{Binding Angle}"
Radius="{Binding Radius}" InnerRadius="{Binding InnerRadius}"
Fill="Black" Opacity="0.7"/>
<Grid util:GridUtils.RowDefinitions="*,2*,*"
util:GridUtils.ColumnDefinitions="*,2*,*">
<Viewbox Grid.Row="1" Grid.Column="1">
<TextBlock Name="myValue" Text="{myValue value}"
Foreground="WhiteSmoke"
FontWeight="Bold"
VerticalAlignment="Center" HorizontalAlignment="Center"/>
</Viewbox>
</Grid></Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
如何从后面的代码（例如，从MainPage.xaml.cs）而不是从CircularProgressBarViewModel更改名称为“ myValue”的值？
如果您需要myValue从MainPage中获取您正在使用的位置UserControl，则可以DependencyProperty在控件中创建并设置页面与控件之间的任何值。
public sealed partial class YourUserControl: UserControl
{
public static readonly DependencyProperty myValueProperty = DependencyProperty.Register("myValue", typeof(string), typeof(YourUserControl), new PropertyMetadata(string.Empty));
public YourUserControl()
{
this.InitializeComponent();
}
public string myValue
{
get { return (string)GetValue(myValueProperty ); }
set { SetValue(myValueProperty , value); }
}
}
并在您的MainPage上这样：
<controls:YourUserControl myValue={Binding YourValue}/>
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