【WPF】XmlDataProvider级联
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了【WPF】XmlDataProvider级联，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含4618字，纯文字阅读大概需要7分钟。
内容图文
首先在绑定的时候进行转换：
public
class
RegionConverter : IValueConverter
{
public
object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var name = value asstring;
var filter = parameter asstring;
if (string.IsNullOrEmpty(name) && filter != "country")
{
returnnull;
}
var provider = new XmlDataProvider();
provider.Source = new Uri("Resources/Region.xml", UriKind.Relative);
if (filter == "country")
{
provider.XPath = "/region/country/@name";
}
elseif (filter == "province")
{
provider.XPath = string.Format("/region/country[@name=‘{0}‘]/province/@name", name);
}
elseif (filter == "city")
{
provider.XPath = string.Format("/region/country/province[@name=‘{0}‘]/city/@name", name);
}
elseif (filter == "town")
{
provider.XPath = string.Format("/region/country/province/city[@name=‘{0}‘]/town/@name", name);
}
return provider;
}
publicobject ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
thrownew NotImplementedException();
}
}
再看以下如何绑定的
<converters:RegionConverter x:Key="region"/>
<ComboBox Grid.Column="0" x:Name="country" DataContext="{Binding Converter={StaticResource region}, ConverterParameter=country}" SelectedValue="{Binding DataContext.CurrEditorItem.Country,UpdateSourceTrigger=PropertyChanged, RelativeSource={RelativeSource AncestorType={x:Type mui:ModernWindow}}}" ItemsSource="{Binding}" Width="85" Style="{StaticResource CommonComboBoxStyle}" /> <ComboBox Grid.Column="2" x:Name="province" DataContext="{Binding SelectedValue, ElementName=country, Converter={StaticResource region}, ConverterParameter=province}" SelectedValue="{Binding DataContext.CurrEditorItem.Province,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource AncestorType={x:Type mui:ModernWindow}}}" ItemsSource="{Binding}" Width="85" Style="{StaticResource CommonComboBoxStyle}" /> <ComboBox Grid.Column="4" x:Name="city" DataContext="{Binding SelectedValue, ElementName=province, Converter={StaticResource region}, ConverterParameter=city}" SelectedValue="{Binding DataContext.CurrEditorItem.City,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource AncestorType={x:Type mui:ModernWindow}}}" ItemsSource="{Binding}" Width="85" Style="{StaticResource CommonComboBoxStyle}" /> <ComboBox Grid.Column="6" x:Name="town" DataContext="{Binding SelectedValue, ElementName=city, Converter={StaticResource region}, ConverterParameter=town}" SelectedValue="{Binding DataContext.CurrEditorItem.Area,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource AncestorType={x:Type mui:ModernWindow}}}" ItemsSource="{Binding}" Text="{Binding Area,UpdateSourceTrigger=PropertyChanged}" Width="85" Style="{StaticResource CommonComboBoxStyle}" /> <TextBlock Grid.Column="0" Text="国家" Tag="{Binding SelectedValue, ElementName=country}" Style="{StaticResource TipTextBlock}"/> <TextBlock Grid.Column="2" Text="省份" Tag="{Binding SelectedValue, ElementName=province}" Style="{StaticResource TipTextBlock}"/> <TextBlock Grid.Column="4" Text="市/区" Tag="{Binding SelectedValue, ElementName=city}" Style="{StaticResource TipTextBlock}"/> <TextBlock Grid.Column="6" Text="县/镇" Tag="{Binding SelectedValue, ElementName=town}" Style="{StaticResource TipTextBlock}"/>
TextBlock放在ComboBox上面，Textblock样式如下
<Style x:Key="TipTextBlock" TargetType="{x:Type TextBlock}"> <Setter Property="IsHitTestVisible" Value="False" /> <Setter Property="HorizontalAlignment" Value="Left"/> <Setter Property="VerticalAlignment" Value="Center"/> <Setter Property="Margin" Value="12,0,0,0"/> <Setter Property="Opacity" Value="0"/> <Style.Triggers> <Trigger Property="Tag" Value="{x:Null}"> <Setter Property="Opacity" Value="1"/> </Trigger> </Style.Triggers> </Style>
枚举在WPF的应用：
<ComboBox x:Name="cbbDataType" ItemsSource="{Binding Source={StaticResource InfoDetailTypeItems}}" SelectedItem="{Binding CurrEditorItem.DataType, ValidatesOnDataErrors=True}" ItemTemplate="{StaticResource InfoDetailTypeDataTemplate}" Grid.Row="2" Grid.Column="1" Style="{StaticResource EditorComboBoxStyle}" />
<x:Array x:Key="InfoDetailTypeItems" Type="{x:Type adservice:ShowDataType}"> <adservice:ShowDataType>Image</adservice:ShowDataType> <adservice:ShowDataType>Video</adservice:ShowDataType> <adservice:ShowDataType>ThreeDModel</adservice:ShowDataType> </x:Array>
原文：http://www.cnblogs.com/wywnet/p/3818951.html
内容总结
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