Windows Phone 7中的XML讀取、過濾以及數(shù)據(jù)綁定

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在這個(gè)小教程，我將演示在Windows Phone 7如何讓ListBox的數(shù)據(jù)綁定XML數(shù)據(jù)。我將使用LINQ to XML，以便加載和讀取數(shù)據(jù)，而且我將展示如何實(shí)現(xiàn)一個(gè)基本的過濾。

首先讓我們先創(chuàng)建一個(gè)Windows Phone 7的應(yīng)用程序項(xiàng)目示例，并添加以下兩個(gè)demo xml文件。

people.xml

<?xml version="1.0" encoding="utf-8" ?>
<people>
    <person>
        <firstname>Kate</firstname>
        <lastname>Smith</lastname>
        <age>27</age>
    </person>
    <person>
        <firstname>Tom</firstname>
        <lastname>Brown</lastname>
        <age>30</age>
    </person>
    <person>
        <firstname>Tim</firstname>
        <lastname>Stone</lastname>
        <age>36</age>
    </person>
    <person>
        <firstname>Ann</firstname>
        <lastname>Peterson</lastname>
        <age>27</age>
    </person>
</people>

在這里我不得不感謝一直支持我的鹵面網(wǎng)版主，是他讓我提起興趣寫了這么一篇文章，再次感謝鹵面網(wǎng)，一個(gè)非常不錯(cuò)的wp7開發(fā)論壇,后面我也將再次向大家發(fā)布幾篇高質(zhì)量文章，請(qǐng)大家到鹵面上找我吧，呵呵

    進(jìn)入正題：

PeopleCustom.xml

<?xml version="1.0"  ?>
<People>
    <Person
       FirstName="Kate"
       LastName="Smith"
       Age="27" />
    <Person
       FirstName="Tom"
       LastName="Brown"
       Age="30" />
    <Person
       FirstName="Tim"
       LastName="Stone"
       Age="36" />
    <Person
       FirstName="Ann"
       LastName="Peterson"
       Age="27" />
</People>

下一步是創(chuàng)建一個(gè)示例類將被用來存儲(chǔ)XML元素值：

public class Person
{
    string firstname;
    string lastname;
    int age;
 
    public string FirstName
    {
        get { return firstname; }
        set { firstname = value; }
    }
 
    public string LastName
    {
        get { return lastname; }
        set { lastname = value; }
    }
 
    public int Age
    {
        get { return age; }
        set { age = value; }
    }
}

為了讀取XML文件的信息，我們將使用的XDocument

所以你首先需要添加System.Xml.Linq.dll引用，然后using System.Xml.Linq;

XDocument loadedData = XDocument.Load("People.xml");
 
var data = from query in loadedData.Descendants("person")
              select new Person
              {
                  FirstName = (string)query.Element("firstname"),
                  LastName = (string)query.Element("lastname"),
                  Age = (int)query.Element("age")
              };
listBox.ItemsSource = data;

在接下來的例子中，我們將通過數(shù)據(jù)的“年齡”屬性值過濾。源代碼如下：

XDocument loadedCustomData = XDocument.Load("PeopleCustom.xml");
var filteredData = from c in loadedCustomData.Descendants("Person")
            where c.Attribute("Age").Value == "27"
            select new Person()
            {
                FirstName = c.Attribute("FirstName").Value,
                LastName = c.Attribute("LastName").Value
                 
            };
 
listBox1.ItemsSource = filteredData;

為了顯示的數(shù)據(jù)，我們將使用以下ItemTemplates綁定ListBox控件：

<StackPanel x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0" Orientation="Horizontal">
    <TextBlock Text="XML Data:"/>
    <ListBox x:Name="listBox">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Margin="10" >
                    <TextBlock Text="{Binding FirstName}"/>
                    <TextBlock Text="{Binding LastName}"/>
                    <TextBlock Text="{Binding Age}"/>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
    <TextBlock Text="Filtered by Age 27:"/>
    <ListBox x:Name="listBox1">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Margin="20" >
                    <TextBlock Text="{Binding FirstName}"/>
                    <TextBlock Text="{Binding LastName}"/>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</StackPanel>