WPF 数据绑定TreeView+DataGrid+XML

学习WPF做的一个数据绑定例子，可供学习参考。
实现功能：WPF通过读取XML数据绑定到TreeView， 在通过TreeView选择项（Node)获取的对应的数据绑定到DataGrid控件上，再通过DataGrid选中行的详细信息数据绑定到DataGrid。

首先创建XML数据

<?xml version="1.0" encoding="utf-8" ?>
<root>
<category name="Computer">
<product name="联想笔记本">
<order orderId="1" orderName="cizon的订单" orderDate="2012-11-10">
<orderInfo productName="联想笔记本" unitPrice="3000" count="2">
</orderInfo>
</order>
<order orderId="2" orderName="steven的订单" orderDate="2012-11-10">
<orderInfo productName="联想笔记本" unitPrice="3000" count="2">
</orderInfo>
</order>
</product>
<product name="宏基笔记本">
<order orderId="1" orderName="Luly的订单" orderDate="2012-11-10">
<orderInfo productName="宏基笔记本" unitPrice="2000" count="3">
</orderInfo>
</order>
<order orderId="2" orderName="steven的订单" orderDate="2012-11-10">
<orderInfo productName="宏基笔记本" unitPrice="2000" count="3">
</orderInfo>
</order>
</product>
<product name="华硕笔记本"></product>
</category>
<category name="TV">
<product name="海尔电视">
<order orderId="1" orderName="cizon的订单" orderDate="2012-11-10">
<orderInfo productName="海尔电视" unitPrice="1000" count="2">
</orderInfo>
</order>
<order orderId="2" orderName="steven的订单" orderDate="2012-11-10">
<orderInfo productName="海尔电视" unitPrice="1000" count="2">
</orderInfo>
</order>
</product>
<product name="长虹电视">
<order orderId="1" orderName="Luly的订单" orderDate="2012-11-10">
<orderInfo productName="长虹电视" unitPrice="2000" count="3">
</orderInfo>
</order>
<order orderId="2" orderName="steven的订单" orderDate="2012-11-10">
<orderInfo productName="长虹电视" unitPrice="2000" count="3">
</orderInfo>
</order>
</product>
<product name="三星电视"></product>
</category>
</root>

创建Model实体类：

public class Category
{
public string Name { get; set; }
public List<Product> Products { get; set; }
}

public class Product
{
public string Name { get; set; }
public List<Order> Orders { get; set; }
}

public class Order
{
public int OrderId { get; set; }
public string OrderName { get; set; }
public DateTime OrderDate { get; set; }
public decimal TotalPrice { get; set; }
public List<OrderInfo> OrderInfos { get; set; }
}

public  class OrderInfo
{
public int OrderId { get; set; }
public string ProductName { get; set; }
public decimal UnitPrice { get; set; }
public int Count { get; set; }
}

创建数据访问类GetData 获取XML中数据：

public class GetData
{
private string path = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + "OrderData.xml";
public List<Category> GetCategorys()
{
XElement xElement = XElement.Load(path);
var categorys = (from n in xElement.Elements("category")
select new Category
{
Name = n.Attribute("name").Value,
Products = GetProducts(n)
}).ToList();
return categorys;
}

private List<Product> GetProducts(XElement xElement)
{
var products = (from n in xElement.Elements("product")
select new Product
{
Name = n.Attribute("name").Value,
Orders = GetOrders(n)
}).ToList();
return products;
}

private List<Order> GetOrders(XElement xElement)
{
var orders = (from n in xElement.Elements("order")
select
new Order
{
OrderId = Convert.ToInt32(n.Attribute("orderId").Value),
OrderName = n.Attribute("orderName").Value,
OrderDate = Convert.ToDateTime(n.Attribute("orderDate").Value),
TotalPrice = GetTotalPrice(n),
OrderInfos = GetOrderInfo(n)
}).ToList();
return orders;
}

private decimal GetTotalPrice(XElement xElement)
{
decimal totalPrice = 0;
List<OrderInfo> orderInfos = GetOrderInfo(xElement);
foreach (var info in orderInfos)
{
totalPrice += info.UnitPrice * info.Count;
}
return totalPrice;
}

private List<OrderInfo> GetOrderInfo(XElement xElement)
{
var orderInfos = (from n in xElement.Elements("orderInfo")
select
new OrderInfo
{
OrderId = Convert.ToInt32(n.Parent.Attribute("orderId").Value),
ProductName = n.Attribute("productName").Value,
UnitPrice = Convert.ToDecimal(n.Attribute("unitPrice").Value),
Count = Convert.ToInt32(n.Attribute("count").Value)
}).ToList();
return orderInfos;
}
}

创建一个ViewModel类实现INotifyPropertyChanged接口通知属性值得改变，实现双向绑定，

public class ViewModel:INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
GetData getData=new GetData();
private List<Category> _categories;
public List<Category> GetCategories
{
get
{
if(_categories==null)
{
_categories = getData.GetCategorys();
}
return _categories;

}
set
{
if(value!=_categories)
{
_categories = value;
if(PropertyChanged!=null)
{
PropertyChanged(this, new PropertyChangedEventArgs("GetCategories"));
}
}
}
}
}

窗体页面绑定代码（不用写后台代码）：

<Window x:Class="WPF.TreeView.DataGrid.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:src="clr-namespace:WPF.TreeView.DataGrid.ViewModel" Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
<src:ViewModel></src:ViewModel>
</Window.DataContext>
<Window.Resources>
<HierarchicalDataTemplate x:Key="treeData"
ItemsSource="{Binding Path=Products}" >
<TextBlock Text="{Binding Path=Name}"></TextBlock>
</HierarchicalDataTemplate>
</Window.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="150"></ColumnDefinition>
<ColumnDefinition Width="10"></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition Height="10"></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>

<TreeView Name="tree"  ItemsSource="{Binding Path=GetCategories}"  ItemTemplate="{StaticResource ResourceKey=treeData}"   Grid.RowSpan="3"></TreeView>
<DataGrid Name="dataGrid1" AutoGenerateColumns="False" ItemsSource="{Binding ElementName='tree', Path=SelectedItem.Orders}" Grid.Column="2" Grid.Row="0">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding OrderId}" Width="*" Header="订单编号"></DataGridTextColumn>
<DataGridTextColumn  Binding="{Binding OrderName}" Width="*" Header="订单名"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding OrderDate}" Width="*" Header="订单日期"></DataGridTextColumn>
<DataGridTextColumn  Binding="{Binding TotalPrice}" Width="*" Header="总额"></DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
<DataGrid Name="dataGrid2" AutoGenerateColumns="False" ItemsSource="{Binding ElementName='dataGrid1', Path=SelectedItem.OrderInfos}" Grid.Column="2" Grid.Row="2">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding OrderId}" Width="*" Header="订单编号"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding ProductName}" Width="*" Header="产品"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding UnitPrice}" Width="*" Header="单价"></DataGridTextColumn>
<DataGridTextColumn Binding="{Binding Count}" Width="*" Header="数量"></DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
</Window>

实现效果如图：