Silverlight 4常用StringFormat格式总结

在Silverlight项目中，经常会根据需求的不同，提供不同的字符格式到客户端。这篇文章总结了目前Silverlight 4常用StringFormat绑定字符格式，方便大家在以后的开发中调用参考。

早期的格式转换方法

在Silverlight 4之前的版本，通常修改字符格式是通过实现IValueConverter接口，在IValueConverter接口中包含有两个方法：

1. Convert， 在绑定源数据传送到客户端显示前，转换修改数据；

2. ConvertBack，在目标数据传送到绑定源数据前，转换修改数据，该方法仅被用于“TwoWay”绑定模式；

例如，根据布尔型判断实现控件是否显示在客户端，下面是一个简单的转换代码，通过实现IValueConverter，判断控件Visibility属性值。

 

 1 public class VisibilityConverter : IValueConverter

 2 

 3 {

 4 

 5 public object Convert(object value,Type targetType,object parameter,CultureInfo culture)

 6 

 7 {

 8 

 9 bool visibility = (bool)value;

 

 return visibility ? Visibility.Visible : Visibility.Collapsed;

 

 }

 

 public object ConvertBack(object value,Type targetType,object parameter,CultureInfo culture)

 

 {

 

 Visibility visibility = (Visibility)value;

 

 return (visibility == Visibility.Visible);

 

 }

 

 }

 

 

Silverlight 4的StringFormat属性

在Silverlight 4中，数据绑定SDK提供一个“StringFormat”的属性，该属性允许开发人员自由定义输出字符格式，例如，DataPicker控件，该控件提供SelectedDateFormat属性，控制其输出格式“短格式”或“长格式”。

SelectedDateFormat="Short", “默认”

SelectedDateFormat="Long"

而如果需要输出“April 01, 2011”格式，则无法使用SelectedDateFormat控制其格式，这时可以使用StringFormat属性完成需求。

<toolkit:DatePicker SelectedDate="{Binding DemoDate,Mode=TwoWay, StringFormat='MMM d, yyyy'}" />

再例如，早期实现一段文字绑定信息需要按照以下格式操作：

<TextBlock Text=”当前登录用户: ”/>

<TextBlock Text=“{Binding Name}”/>

输出: 当前登录用户Jv9

在Silverlight 4中使用StringFormat属性，可以简单的实现如下:

<TextBlock Text=“{Binding Name, StringFormat=’当前登录用户: \{0\}’}”>

这样实现简单而又方便。

对于StringFormat属性的使用方法还有很多，下面使用实例演示常用的属性：

 

  1 <Grid x:Name="LayoutRoot">

  2 <ScrollViewer x:Name="PageScrollViewer" Style="{StaticResource PageScrollViewerStyle}">

  3 <StackPanel Orientation="Horizontal">

  4 <StackPanel x:Name="ContentStackPanel">

  5 <TextBlock FontSize="16" TextWrapping="Wrap" Text="StringFormat和字符串格式" Margin="8"/>

  6 <Border BorderBrush="LightGray" BorderThickness="1" Width="300" Margin="5" HorizontalAlignment="Left">

  7 <StackPanel Orientation="Vertical" Margin="5" >

  8 <TextBox x:Name="txtSource" Width="125" HorizontalAlignment="Left"/>

  9 <TextBlock TextWrapping="Wrap" Text="StringFormat='正在输入 &quot;\{0\}&quot;." FontWeight="Bold" Margin="0,4,0,2"/>

 10 <TextBlock Text="{Binding Text, ElementName=txtSource, StringFormat='正在输入 &quot;\{0\}&quot;.'}" TextWrapping="Wrap" Margin="0,0,0,4"/>

 11 <TextBlock TextWrapping="Wrap" Text="StringFormat=\{0\,20\}" FontWeight="Bold" Margin="0,4,0,2"/>

 12 <TextBlock Text="{Binding Text, ElementName=txtSource, StringFormat=\{0\,20\}}" TextWrapping="Wrap" Margin="0,0,0,4" />

 13 <TextBlock TextWrapping="Wrap" Text="StringFormat=\{0\,-20\}" FontWeight="Bold" Margin="0,4,0,2"/>

 14 <TextBlock Text="{Binding Text, ElementName=txtSource, StringFormat=\{0\,-20\}}" TextWrapping="Wrap" Margin="0,0,0,4"/>

 15 </StackPanel>

 16 </Border>

 17 

 18 <StackPanel x:Name="DatePanel">

 19 <TextBlock Text="StringFormat和日期格式" Margin="8" FontSize="16" />

 20 <Border BorderBrush="LightGray" BorderThickness="1" Width="300" Margin="5" HorizontalAlignment="Left">

 21 <StackPanel DataContext="{StaticResource SampleDate}">

 22 <TextBlock TextWrapping="Wrap" Text="StringFormat=f" FontWeight="Bold" Margin="0,4,0,2"/>

 23 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=f}" Margin="8,0" />

 24 <TextBlock TextWrapping="Wrap" Text="StringFormat=F" FontWeight="Bold" Margin="0,4,0,2"/>

 25 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=F}" Margin="8,0" />

 26 <TextBlock TextWrapping="Wrap" Text="StringFormat=g" FontWeight="Bold" Margin="0,4,0,2"/>

 27 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=g}" Margin="8,0" />

 28 <TextBlock TextWrapping="Wrap" Text="StringFormat=G" FontWeight="Bold" Margin="0,4,0,2"/>

 29 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=G}" Margin="8,0" />

 30 <TextBlock TextWrapping="Wrap" Text="StringFormat=m" FontWeight="Bold" Margin="0,4,0,2"/>

 31 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=m}" Margin="8,0" />

 32 <TextBlock TextWrapping="Wrap" Text="StringFormat=y" FontWeight="Bold" Margin="0,4,0,2"/>

 33 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=y}" Margin="8,0" />

 34 <TextBlock TextWrapping="Wrap" Text="StringFormat=t" FontWeight="Bold" Margin="0,4,0,2"/>

 35 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=t}" Margin="8,0" />

 36 <TextBlock TextWrapping="Wrap" Text="StringFormat=T" FontWeight="Bold" Margin="0,4,0,2"/>

 37 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=T}" Margin="8,0" />

 38 <TextBlock TextWrapping="Wrap" Text="StringFormat=u" FontWeight="Bold" Margin="0,4,0,2"/>

 39 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=u}" Margin="8,0" />

 40 <TextBlock TextWrapping="Wrap" Text="StringFormat=o" FontWeight="Bold" Margin="0,4,0,2"/>

 41 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=o}" Margin="8,0" />

 42 <TextBlock TextWrapping="Wrap" Text="StringFormat=MM/dd/yy" FontWeight="Bold" Margin="0,4,0,2"/>

 43 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=MM/dd/yy}" Margin="8,0"/>

 44 <TextBlock TextWrapping="Wrap" Text="StringFormat=MMMM dd\, yyyy g" FontWeight="Bold" Margin="0,4,0,2"/>

 45 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=MMMM dd\, yyyy g}" Margin="8,0" />

 46 <TextBlock TextWrapping="Wrap" Text="StringFormat=hh:mm:ss.fff tt" FontWeight="Bold" Margin="0,4,0,2"/>

 47 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=hh:mm:ss.fff tt}" Margin="8,0" />

 48 <TextBlock TextWrapping="Wrap" Text="StringFormat=\{0:r\}" FontWeight="Bold" Margin="0,4,0,2"/>

 49 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat=\{0:r\}}" Margin="8,0" />

 50 <TextBlock TextWrapping="Wrap" Text="StringFormat='MMM d, yyyy'" FontWeight="Bold" Margin="0,4,0,2"/>

 51 <TextBlock TextWrapping="Wrap" Text="{Binding CurrentDateTime, StringFormat='MMM d, yyyy'}" Margin="8,0" />

 52 </StackPanel>

 53 </Border> 

 54 </StackPanel>

 55 </StackPanel>

 56 <StackPanel Orientation="Vertical" >

 57 <TextBlock Text="StringFormat和数字演示" Margin="8" FontSize="16"/>

 58 <Border BorderBrush="LightGray" BorderThickness="1" Width="300" Margin="5" HorizontalAlignment="Left">

 59 <StackPanel Orientation="Vertical" Margin="5">

 60 <Grid >

 61 <Grid.RowDefinitions>

 62 <RowDefinition Height="Auto"/>

 63 <RowDefinition Height="Auto"/>

 64 </Grid.RowDefinitions>

 65 <Grid.ColumnDefinitions>

 66 <ColumnDefinition Width="Auto" MinWidth="18"/>

 67 <ColumnDefinition/>

 68 <ColumnDefinition Width="Auto" MinWidth="28"/>

 69 </Grid.ColumnDefinitions>

 70 <TextBlock Text="1" HorizontalAlignment="Left" d:LayoutOverrides="Height" />

 71 <TextBlock Text="100,000" d:LayoutOverrides="Width, Height" Grid.Column="2" Margin="0" />

 72 <Slider x:Name="BigNumSlider" Margin="0" d:LayoutOverrides="Height" Grid.ColumnSpan="3" Grid.Row="1" Maximum="100000" Minimum="1" Value="50000"/>

 73 </Grid>

 74 <TextBlock TextWrapping="Wrap" Text="StringFormat=c" FontWeight="Bold" Margin="0,4,0,2"/>

 75 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider, Mode=TwoWay, StringFormat=c}" Margin="8,0"/>

 76 <TextBlock TextWrapping="Wrap" Text="StringFormat=目前拥有现金 \{0:C0\}" FontWeight="Bold" Margin="0,4,0,2"/>

 77 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider, Mode=TwoWay, StringFormat=目前拥有现金 \{0:C0\}}" Margin="8,0"/>

 78 <TextBlock TextWrapping="Wrap" Text="StringFormat=e" FontWeight="Bold" Margin="0,4,0,2"/>

 79 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider, Mode=TwoWay, StringFormat=e}" Margin="8,0"/>

 80 <TextBlock TextWrapping="Wrap" Text="StringFormat=\{0:E4\}" FontWeight="Bold" Margin="0,4,0,2"/>

 81 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider, Mode=TwoWay, StringFormat=\{0:E4\}}" Margin="8,0"/>

 82 <TextBlock TextWrapping="Wrap" Text="StringFormat=n" FontWeight="Bold" Margin="0,4,0,2"/>

 83 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider, Mode=TwoWay, StringFormat=n}" Margin="8,0"/>

 84 <TextBlock TextWrapping="Wrap" Text="StringFormat=\{0:N0\}" FontWeight="Bold" Margin="0,4,0,2"/>

 85 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider, Mode=TwoWay, StringFormat=\{0:N0\}}" Margin="8,0"/>

 86 <TextBlock TextWrapping="Wrap" Text="StringFormat='###,###.##'" FontWeight="Bold" Margin="0,4,0,2"/>

 87 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider, Mode=TwoWay, StringFormat='###,###.##'}" Margin="8,0" />

 88 </StackPanel>

 89 </Border>

 90 <Border BorderBrush="LightGray" BorderThickness="1" Width="300" Margin="5" HorizontalAlignment="Left">

 91 <StackPanel Orientation="Vertical" Margin="5">

 92 <Grid >

 93 <Grid.RowDefinitions>

 94 <RowDefinition Height="Auto"/>

 95 <RowDefinition Height="Auto"/>

 96 </Grid.RowDefinitions>

 97 <Grid.ColumnDefinitions>

 98 <ColumnDefinition Width="Auto" MinWidth="18"/>

 99 <ColumnDefinition/>

 <ColumnDefinition Width="Auto" MinWidth="28"/>

 </Grid.ColumnDefinitions>

 <TextBlock Text="-1" HorizontalAlignment="Left" d:LayoutOverrides="Height" />

 <TextBlock Text="1" d:LayoutOverrides="Width, Height" Grid.Column="2" Margin="0" />

 <Slider x:Name="BigNumSlider1" Margin="0" d:LayoutOverrides="Height" Grid.ColumnSpan="3" Grid.Row="1" Maximum="1" Minimum="-1" Value="0.2" LargeChange="0.1" SmallChange="0.01"/>

 </Grid>

 <TextBlock TextWrapping="Wrap" Text="StringFormat=n" FontWeight="Bold" Margin="0,4,0,2"/>

 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider1, Mode=TwoWay, StringFormat=n}" Margin="8,0"/>

 <TextBlock TextWrapping="Wrap" Text="StringFormat=\{0:N4\}" FontWeight="Bold" Margin="0,4,0,2"/>

 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider1, Mode=TwoWay, StringFormat=\{0:N4\}}" Margin="8,0"/>

 <TextBlock TextWrapping="Wrap" Text="StringFormat=p" FontWeight="Bold" Margin="0,4,0,2"/>

 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider1, Mode=TwoWay, StringFormat=p}" Margin="8,0"/>

 <TextBlock TextWrapping="Wrap" Text="StringFormat=\{0:P0\}" FontWeight="Bold" Margin="0,4,0,2"/>

 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider1, Mode=TwoWay, StringFormat=\{0:P0\}}" Margin="8,0"/>

 <TextBlock TextWrapping="Wrap" Text="StringFormat=\{0:E5\}" FontWeight="Bold" Margin="0,4,0,2"/>

 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider1, Mode=TwoWay, StringFormat=\{0:E5\}}" Margin="8,0"/>

 <TextBlock TextWrapping="Wrap" Text="StringFormat=\{0:C3\}" FontWeight="Bold" Margin="0,4,0,2"/>

 <TextBox TextWrapping="Wrap" Text="{Binding Value, ElementName=BigNumSlider1, Mode=TwoWay, StringFormat=\{0:C3\}}" Margin="8,0"/>

 </StackPanel>

 </Border>

 </StackPanel>

 

 </StackPanel>

 </ScrollViewer>

 </Grid>

 

源代码下载

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