问题 无法在后面的cs代码中从XmlDataProvider填充WPF ComboBox。
背景 我们有一个WPF窗口作为更大的桌面WPF应用程序的一部分。该窗口显示ListView，其数据是从外部xml文件获取的。
目标是能够根据ComboBox中的选择过滤ListView。
使用Window_Loaded中的XmlDataProvider填充ListView。
ListView有四列：
我们需要能够按项目名称过滤列表。
XML文件需要是外部的，因为由用户决定要查看哪个XML文件。
WPF XAML代码：
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="106*"/>
<ColumnDefinition Width="227*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="17*"/>
<RowDefinition Height="73*"/>
</Grid.RowDefinitions>
<Label Content="DAL File Location" HorizontalAlignment="Left" Margin="46,10,0,0" VerticalAlignment="Top"/>
<TextBox x:Name="DALLocation" HorizontalAlignment="Left" Height="23" Margin="170,13,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="258" Grid.ColumnSpan="2"/>
<Button x:Name="DALBrowse" Content="Browse" HorizontalAlignment="Left" Margin="235,13,0,0" VerticalAlignment="Top" Width="75" Grid.Column="1" Click="DALBrowse_Click"/>
<ListView x:Name="dal_list" HorizontalAlignment="Stretch" Height="Auto" Margin="6,6,6,6" Grid.Row="1" VerticalAlignment="Stretch" Width="Auto" Grid.ColumnSpan="2" ItemsSource="{Binding}">
<ListView.View>
<GridView>
<GridViewColumn Header="Entry Date" Width="120" DisplayMemberBinding="{Binding XPath=entry_date}" />
<GridViewColumn Header="Project" Width="120" DisplayMemberBinding="{Binding XPath=project_name}" />
<GridViewColumn Header="Node" Width="120" DisplayMemberBinding="{Binding XPath=node_name}" />
<GridViewColumn Header="Entry" Width="120" DisplayMemberBinding="{Binding XPath=entry_text}" />
<GridViewColumn Width="0" DisplayMemberBinding="{Binding XPath=sort_date}" />
</GridView>
</ListView.View>
</ListView>
<Label Content="Project" HorizontalAlignment="Left" Margin="46,41,0,0" VerticalAlignment="Top"/>
<ComboBox x:Name="cbProjects" Grid.ColumnSpan="2" HorizontalAlignment="Left" Margin="170,41,0,0" VerticalAlignment="Top" Width="120" ItemsSource="{Binding XPath=project_name}" DisplayMemberPath="@Name" SelectedValuePath="@Name"/>
</Grid>
代码背后
public partial class DALManager : Window
{
public string dalFolder;
public string dalFile;
public DALManager()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
this.DALLocation.Text = dalFolder;
XmlDataProvider xmlData = new XmlDataProvider();
xmlData.Source = new Uri(dalFolder + dalFile);
xmlData.XPath = "DAL/entry";
dal_list.DataContext = xmlData;
cbProjects.DataContext = xmlData;
}
private void DALBrowse_Click(object sender, RoutedEventArgs e)
{
System.Windows.Forms.FolderBrowserDialog fbd = new System.Windows.Forms.FolderBrowserDialog();
fbd.ShowNewFolderButton = false;
if (fbd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
this.DALLocation.Text = fbd.SelectedPath;
string oldPath = CGlobals.dal_path + "\\DAL.xml";
string newPath = fbd.SelectedPath + "\\DAL.xml";
File.Move(oldPath, newPath);
RegistryKey rgKey = Registry.CurrentUser.CreateSubKey("SOFTWARE\\SCP-Computers\\DocuMinder");
CGlobals.dal_path = fbd.SelectedPath;
using (RegistryKey
rgInfo = rgKey.CreateSubKey("UserInfo"))
{
rgInfo.SetValue("dal_path", CGlobals.dal_path);
}
}
}
}
XML文件
<?xml version="1.0" encoding="utf-8"?>
<DAL>
<entry id="fe08125d-c785-40fc-816a-1e5ed3f06c7f-1">
<sort_date>2017-10-01</sort_date>
<entry_date>01/10/2017</entry_date>
<project_id>0</project_id>
<project_name Name="Dal Test">DAL Test</project_name>
<node_name>notes</node_name>
<entry_text>here is line 1 changed</entry_text>
</entry>
<entry id="fe08125d-c785-40fc-816a-1e5ed3f06c7f-2">
<sort_date>2017-10-03</sort_date>
<entry_date>03/10/2017</entry_date>
<project_id>0</project_id>
<project_name Name="Dal Test">DAL Test</project_name>
<node_name>notes</node_name>
<entry_text>Here is line 2</entry_text>
</entry>
<entry id="fe08125d-c785-40fc-816a-1e5ed3f06c7f-3">
<sort_date>2017-10-10</sort_date>
<entry_date>10/10/2017</entry_date>
<project_id>0</project_id>
<project_name Name="Dal Test">DAL Test</project_name>
<node_name>notes</node_name>
<entry_text>Here is line 3 </entry_text>
</entry>
<entry id="fe08125d-c785-40fc-816a-1e5ed3f06c7f-4">
<sort_date>2017-10-11</sort_date>
<entry_date>11/10/2017</entry_date>
<project_id>0</project_id>
<project_name Name="Dal Test">DAL Test</project_name>
<node_name>notes</node_name>
<entry_text>Added line 4</entry_text>
</entry>
<entry id="d9832a83-4aaa-4dd1-8c19-e469f1e5e1ed-1">
<sort_date>2017-10-11</sort_date>
<entry_date>11/10/2017</entry_date>
<project_id>0</project_id>
<project_name Name="Dal Test">DAL Test</project_name>
<node_name>Another Node With Notes</node_name>
<entry_text>Here is a note in another node.</entry_text>
</entry>
<entry id="b0e36598-26e1-4204-b11a-665da02ff121-1">
<sort_date>2017-10-11</sort_date>
<entry_date>11/10/2017</entry_date>
<project_id>0</project_id>
<project_name Name="Dal Test 2">DAL Test 2</project_name>
<node_name>Testing DAL in another project</node_name>
<entry_text>This is another project.</entry_text>
</entry>
<entry id="280743c7-c7e0-4345-9be3-fc502e3d1a45-1">
<sort_date>2017-10-11</sort_date>
<entry_date>11/10/2017</entry_date>
<project_id>0</project_id>
<project_name Name="Dal Test 2">DAL Test 2</project_name>
<node_name>Test new node</node_name>
<entry_text>Test if node name gets include when new.</entry_text>
</entry>
<entry id="5a660158-3d56-477f-935b-d8270560cd1d-1">
<sort_date>2017-10-11</sort_date>
<entry_date>11/10/2017</entry_date>
<project_id>0</project_id>
<project_name Name="Dal Test 2">DAL Test 2</project_name>
<node_name>Finding new node name</node_name>
<entry_text>Add the note text. </entry_text>
</entry>
<entry id="414844c2-7498-4794-9267-1abcc99de3c3-1">
<sort_date>2017-10-11</sort_date>
<entry_date>11/10/2017</entry_date>
<project_id>0</project_id>
<project_name Name="Dal Test 2">DAL Test 2</project_name>
<node_name>Test new new node</node_name>
<entry_text>Here is the text</entry_text>
</entry>
</DAL>
结果
我只获得了ComboBox中列出的第一个项目名称。
我已经在XAML文件中尝试了各种组合，以根据stackoverflow上的许多其他问题绑定ComboBox，但我找不到任何适用于我的情况。
提前致谢。