[WPF] xmldataprovider Cascade

First, perform conversion during binding:

  public class RegionConverter : IValueConverter    {        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            var name = value as string;            var filter = parameter as string;            if (string.IsNullOrEmpty(name) && filter != "country")            {                return null;            }            var provider = new XmlDataProvider();            provider.Source = new Uri("Resources/Region.xml", UriKind.Relative);            if (filter == "country")            {                provider.XPath = "/region/country/@name";            }            else if (filter == "province")            {                provider.XPath = string.Format("/region/country[@name=‘{0}‘]/province/@name", name);            }            else if (filter == "city")            {                provider.XPath = string.Format("/region/country/province[@name=‘{0}‘]/city/@name", name);            }            else if (filter == "town")            {                provider.XPath = string.Format("/region/country/province/city[@name=‘{0}‘]/town/@name", name);            }            return provider;        }        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            throw new NotImplementedException();        }    }

See how to bind the following

 <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 = "country" tag = "{binding selectedvalue, elementname = country}" style = "{staticresource tiptextblock}"/> <textblock grid. column = "2" text = "Province" tag = "{binding selectedvalue, elementname = province}" style = "{staticresource tiptextblock}"/> <textblock grid. column = "4" text = "city/District" tag = "{binding selectedvalue, elementname = city}" style = "{staticresource tiptextblock}"/> <textblock grid. column = "6" text = "/" tag = "{binding selectedvalue, elementname = town}" style = "{staticresource tiptextblock}"/>

Textblock is placed on the ComboBox, And the textblock style is as follows:

  <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>

Enumeration applications in WPF:

  <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>