【windows phone】CollectionViewSource的妙用

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在windows phone中綁定集合資料的時候,有時候需要分層資料,通常需要以主從試圖形式顯示。通常的方法是將第二個ListBox(主視圖)的資料來源綁定到第一個ListBox

(從視圖)的SelectedItem,或者通過第一個ListBox的SelectionChanged事件來設定綁定。但是藉助CollectionViewSource類可以更方便的實現;

CollectionView是一個集合視圖類,支援資料的排序、分組、過濾。對資料的映像進行排列組合;

CollectionViewSource是CollectionView的一個XAML代理,可以在XAML中使用;

案例說明:用主從試圖關係顯示兩個的員工列表;如下:

前期工作,建立三個類來初始資料來源;

(1)Employee.cs

    public class Employee    {        public int Number { get; set; } //工號        public string  Name { get; set; } //姓名        public string  Sex { get; set; } //性別        public int BirthYear { get; set; } //出生年份    }

(2)Department.cs

    public class Department:ObservableCollection<Employee>    {            public string DepName { get; set; }            public ObservableCollection<Employee> Employees { get; set; }    }

(3)DepartmentList.cs

    public class DepartmentList:ObservableCollection<Department>    {        public DepartmentList()        {            ObservableCollection<Employee> employee1 = new ObservableCollection<Employee>             {                new Employee{Number=2012,Name="netboy",Sex="boy",BirthYear=1992},                new Employee{Number=2013,Name="dandan",Sex="girl",BirthYear=2000},                new Employee{Number=2014,Name="xiaobai",Sex="girl",BirthYear=2012}            };            ObservableCollection<Employee> employee2 = new ObservableCollection<Employee>             {                new Employee{Number=2020,Name="kaizi",Sex="girl",BirthYear=2011},                new Employee{Number=2021,Name="yangzai",Sex="gril",BirthYear=2010}            };            this.Add(new Department { DepName = "技術部", Employees = employee1 });            this.Add(new Department { DepName = "商務部", Employees = employee2 });            //ObservableCollection<Department> deparment = new ObservableCollection<Department>             //{            //    new Department{DepName="tengfei",Employees=employee1},            //    new Department{DepName="google",Employees=employee2}            //};        }    }

注意:使用ObservableCollection<T>的時候需要引用命名空間——using System.Collections.ObjectModel;

通過在建立頁面的phone:PhoneApplicationPage標記中添加一個命名空間映射。代碼如下:

xmlns:local="clr-namespace:資料繫結"//我的項目為“資料繫結”

添加資源字典:

   <phone:PhoneApplicationPage.Resources>        <local:DepartmentList x:Key="deplist"/>        <CollectionViewSource x:Key="departmentView"                              Source="{StaticResource deplist}"/>        <DataTemplate x:Key="dtEmployees">            <StackPanel Height="50"                        HorizontalAlignment="Center"                        Width="480"                        VerticalAlignment="Top"                        Orientation="Horizontal">                <TextBlock Height="50"                           HorizontalAlignment="Left"                           Width="90"                           Text="{Binding Number}"/>                <TextBlock Height="50"                           Width="120"                           Text="{Binding Name}"/>                <TextBlock Height="50"                           Width="120"                           Text="{Binding BirthYear}"/>                <TextBlock Height="50"                           Width="120"                           Text="{Binding Sex}"/>            </StackPanel>        </DataTemplate>    </phone:PhoneApplicationPage.Resources>

在布局頁面中添加如下代碼:

            <TextBlock Width="300"                       Height="50"                       FontSize="36"                       Text="請選擇部門:"                       HorizontalAlignment="Left"                       VerticalAlignment="Top"                       Margin="10,30,0,0"/>            <ListBox Name="lb1"                     Height="100"                     Width="156"                     DisplayMemberPath="DepName"                     ItemsSource="{Binding Source={StaticResource departmentView}}"                     Margin="40,86,260,0"                     HorizontalAlignment="Center"                     VerticalAlignment="Top" FontSize="32" />            <TextBlock Height="62"                       Width="111"                       HorizontalAlignment="Left"                       VerticalAlignment="Top"                       Text="{Binding Path=DepName,Source={StaticResource departmentView}}"                       Foreground="Red" Margin="12,210,0,0" FontSize="32" />            <TextBlock Height="50"                       HorizontalAlignment="Right"                       Text="員工列表"                       VerticalAlignment="Top" Margin="0,210,169,0" Width="158" FontSize="32" />            <TextBlock Height="50"                       HorizontalAlignment="Left"                       Width="120"                       Text="性別" Margin="344,278,0,279" FontSize="32" />            <TextBlock Height="50" Text="出生日期" Margin="204,278,112,279" FontSize="32" />            <TextBlock Height="50"                       Width="120"                       Text="工號" Margin="6,278,330,279" FontSize="32" />            <TextBlock Height="50"                       Width="98"                       Text="名字" Margin="0,278,260,279" HorizontalAlignment="Right" FontSize="32" />            <ListBox Name="lb2"                     Height="170"                     VerticalAlignment="Top"                     ItemsSource="{Binding Path=Employees,Source={StaticResource departmentView}}"                     ItemTemplate="{StaticResource dtEmployees}" Margin="12,334,-46,0" FontSize="32" />
http://www.cnblogs.com/ngnetboy/archive/2012/04/12/2444659.html

【windows phone】CollectionViewSource的妙用

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