绑定到XMLDataProvider
问题描述：
做了一个简单的测试项目中，我试图绑定到的XmlDataSource在原视图模型
Made a simple test project where i try to bind to a xmldatasource in a proto viewmodel
public partial class Window1 : Window
{
//private XmlDataProvider _provider = new XmlDataProvider();
private MyViewModel _myViewModel = new MyViewModel();
public Window1()
{
InitializeComponent();
this.DataContext = _myViewModel ;
}
}
public class MyViewModel
{
public MyViewModel()
{
LoadXMLData();
}
private XmlDataProvider _provider = new XmlDataProvider();
public XmlDataProvider Reports
{
get { return _provider; }
set { _provider = value; }
}
private void LoadXMLData()
{
string filePath = Directory.GetCurrentDirectory() + @"\Reports2.xml";
System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
doc.Load(filePath);
_provider.Document = doc;
_provider.XPath = @"Reports/Report";
}
}
如果我尝试绑定这样一个列表框。我什么也没得到。
If i try to bind a listbox like this. I get nothing
<ListBox x:Name="TeamsListBox" Margin="0,0,0,20" DockPanel.Dock="Left"
ItemsSource="{Binding Reports}"
ItemTemplate="{StaticResource teamItemTemplate}"
IsSynchronizedWithCurrentItem="True"
Visibility="Visible" SelectionMode="Single">
</ListBox>
如果我不是改变的DataContext为
If i instead change datacontext to
this.DataContext = _myViewModel.Reports
和列表框
<ListBox x:Name="TeamsListBox" Margin="0,0,0,20" DockPanel.Dock="Left"
ItemsSource="{Binding}"
ItemTemplate="{StaticResource teamItemTemplate}"
IsSynchronizedWithCurrentItem="True"
Visibility="Visible" SelectionMode="Single">
</ListBox>
然后，它的工作原理，我怎么绑定到视图模型，所以我可以用比刚上的XmlDataSource
Then it works, how do i bind to the viewmodel so i can fill it with more than just on xmldatasource
如果我把一个断点物业报告中，我可以看到，它被称为当我做{结合报告}但名单仍是空的。
If i put a breakpoint on property Report i can see that it is called when i do {Binding Reports} but the list is still empty.
更新
我能做到这一点在code绑定，然后它的作品
I can do this binding in code and then it works
Binding binding = new Binding();
binding.Source = _myViewModel.Reports;
binding.XPath = @"Reports/Report";
TeamsListBox.SetBinding(ListBox.ItemsSourceProperty, binding);
为什么不能我这样做在XAML
Why cant i do that in XAML
答
好像我有一些问题，使用XPath的理解和我一般的问题是如何绑定到一个动态xmldataprovider与XAML中的视图模型。解决了这个样子。
Seems like i had some problems with the understanding of XPath and my general question was how to bind to a dynamic xmldataprovider in a viewmodel with xaml. Solved it like this.
XML
<?xml version="1.0" encoding="utf-8"?>
<Reports xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Report Id="AAAAA-ABBB">
<DocId>30110001</DocId>
<DocName>Report name1</DocName>
<DocType>2010-01-01</DocType>
<Status>1</Status>
<CreatedById>1</CreatedById>
<SiteId>1</SiteId>
<Language>1</Language>
<Updated>2011-01-01</Updated>
<Published>2011-01-01</Published>
<FilePath>c:\\reports\20011001.docx</FilePath>
</Report>
<Report Id="AAAAA-ABBC">
<DocId>30110002</DocId>
<DocName>Report name2</DocName>
<DocType>2010-01-01</DocType>
<Status>1</Status>
<CreatedById>1</CreatedById>
<SiteId>1</SiteId>
<Language>1</Language>
<Updated>2011-01-01</Updated>
<Published>2011-01-01</Published>
<FilePath>c:\\reports\20011001.docx</FilePath>
</Report>
</Reports>
窗口1
<Window x:Class="WpfApplication2.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
Title="Window1" Height="300" Width="300">
<Window.Resources>
<DataTemplate x:Key="reportItemTemplate">
<StackPanel Orientation="Horizontal">
<Label Content="{Binding XPath=DocId}"/>
<Label Content="{Binding XPath=DocName}"/>
</StackPanel>
</DataTemplate>
</Window.Resources>
<StackPanel DataContext="{Binding LocalReports}" >
<ListBox
ItemsSource="{Binding}"
ItemTemplate="{StaticResource reportItemTemplate}"
IsSynchronizedWithCurrentItem="True"
Visibility="Visible" SelectionMode="Single"
/>
<TextBox Text="{Binding XPath=DocId, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
<TextBox Text="{Binding XPath=DocName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
<Button Content="Button" Height="23" Name="button1" Click="button1_Click" />
</StackPanel>
</Window>
Window1.xaml.cs
Window1.xaml.cs
namespace WpfApplication2
{
/// <summary>
/// Interaction logic for Window1.xaml
/// </summary>
public partial class Window1 : Window
{
//private XmlDataProvider _provider = new XmlDataProvider();
private MyViewModel _myViewModel = new MyViewModel();
public Window1()
{
InitializeComponent();
this.DataContext = _myViewModel;
}
private void button1_Click(object sender, RoutedEventArgs e)
{
_myViewModel.Save();
}
}
public class MyViewModel
{
public MyViewModel()
{
}
private XmlDataProvider _provider;
public XmlDataProvider LocalReports
{
get
{
String file = Directory.GetCurrentDirectory() + @"\Reports2.xml";
_provider = new XmlDataProvider()
{
Source = new Uri(file, UriKind.Absolute),
XPath = "Reports/Report"
};
return _provider;
}
}
}
public void Save()
{
string source = _provider.Source.LocalPath;
_provider.Document.Save(source);
}
}
}