WP7->界面->ListBox数据绑定、图文混编、动态添加行
问题:如何使用ListBox进行图文混编
我的理解:实际就是对ListBox进行数据绑定(添加数据模板),然后动态添加行(ListItem)
示例:
前置条件:
1) XAML基础
2) C#基础
3) WP7基础 -> listbox使用基本知识 ->工程创建
实现:
目录:
1) 创建一个基本应用
2) 插入button及listbox控件
3) 给listbox添加Item模板
4) 创建Content及ContentCollection类
5) 写入事件代码
6) 测试运行
1 创建一个基本应用
1) 创建一个基本的Windows Phone应用程序,OS版本7.0
2) 清除多余的界面元素(留下一个基本的Grid控件)
1 <Grid x:Name="LayoutRoot" Background="Transparent"> 2 3 </Grid>
2 插入button及listbox控件
1 <Grid x:Name="LayoutRoot" Background="Transparent"> 2 <Grid.RowDefinitions> 3 <RowDefinition Height="72*" /> 4 <RowDefinition Height="696*" /> 5 </Grid.RowDefinitions> 6 <Button Content="Add" Height="72" HorizontalAlignment="Left" Margin="12,0,0,0" Name="button1" VerticalAlignment="Top" Width="160"/> 7 <ListBox Grid.Row="1" Name="listBox1"> 8 9 </ListBox> 10 </Grid>
3 给listbox添加Item模板
1) 添加一个Itme模板属性
1 <Grid x:Name="LayoutRoot" Background="Transparent"> 2 <Grid.RowDefinitions> 3 <RowDefinition Height="72*" /> 4 <RowDefinition Height="696*" /> 5 </Grid.RowDefinitions> 6 <Button Content="Add" Height="72" HorizontalAlignment="Left" Margin="12,0,0,0" Name="button1" VerticalAlignment="Top" Width="160" /> 7 <ListBox Grid.Row="1" Name="listBox1"> 8 <ListBox.ItemTemplate> 9 <DataTemplate> 10 11 </DataTemplate> 12 </ListBox.ItemTemplate> 13 </ListBox> 14 </Grid>
2) 给Itme模板添加样式
(注:Item模板的样式是看不到的,但是你可以将模板样式的代码放到新建页面中去看实际效果)
样式代码:
1 <Grid Width="455" Height="120"> 2 <Grid.ColumnDefinitions> 3 <ColumnDefinition Width="Auto" /> 4 <ColumnDefinition Width="Auto" /> 5 </Grid.ColumnDefinitions> 6 <Image Grid.Column="0" Width="120" Height="120" Stretch="Fill" HorizontalAlignment="Left" VerticalAlignment="Top"/> 7 <Grid Grid.Column="1" Name="grid1" > 8 <Grid.RowDefinitions> 9 <RowDefinition Height="60*" /> 10 <RowDefinition Height="60*" /> 11 </Grid.RowDefinitions> 12 <TextBlock Height="30" HorizontalAlignment="Left" Name="textBlock1" VerticalAlignment="Top" Width="332" Text="123" /> 13 <TextBlock Grid.Row="1" Height="30" HorizontalAlignment="Left" Name="textBlock2" Text="234" VerticalAlignment="Top" Width="332" /> 14 </Grid> 15 </Grid>
新建一个页面,添加该样式的代码,效果如下:
给模板添加样式后的代码:
1 <Grid x:Name="LayoutRoot" Background="Transparent"> 2 <Grid.RowDefinitions> 3 <RowDefinition Height="72*" /> 4 <RowDefinition Height="696*" /> 5 </Grid.RowDefinitions> 6 <Button Content="Add" Height="72" HorizontalAlignment="Left" Margin="12,0,0,0" Name="button1" VerticalAlignment="Top" Width="160" /> 7 <ListBox Grid.Row="1" Name="listBox1"> 8 <ListBox.ItemTemplate> 9 <DataTemplate> 10 <Grid Width="455" Height="120"> 11 <Grid.ColumnDefinitions> 12 <ColumnDefinition Width="Auto" /> 13 <ColumnDefinition Width="Auto" /> 14 </Grid.ColumnDefinitions> 15 <Image Grid.Column="0" Width="120" Height="120" Stretch="Fill" HorizontalAlignment="Left" VerticalAlignment="Top"/> 16 <Grid Grid.Column="1" Name="grid1" > 17 <Grid.RowDefinitions> 18 <RowDefinition Height="60*" /> 19 <RowDefinition Height="60*" /> 20 </Grid.RowDefinitions> 21 <TextBlock Height="30" HorizontalAlignment="Left" Name="textBlock1" VerticalAlignment="Top" Width="332" Text="123" /> 22 <TextBlock Grid.Row="1" Height="30" HorizontalAlignment="Left" Name="textBlock2" Text="234" VerticalAlignment="Top" Width="332" /> 23 </Grid> 24 </Grid> 25 </DataTemplate> 26 </ListBox.ItemTemplate> 27 </ListBox> 28 </Grid>
3) 为Image控件及TextBlock控件添加绑定数据源
为Image控件添加一个新属性source="{Binding Img}" 意思是Image的source属性绑定了Img这个量。(注:source可以是一个图片的网络地址,也可以是一个本地图片的地址)
修改TextBlock控件的Text属性分别为Text="{Binding Time}" 和 Text="{Binding Count}",意思是这两个控件的text属性分别绑定了Time量和Count量。
最终界面代码如下
1 <Grid x:Name="LayoutRoot" Background="Transparent"> 2 <Grid.RowDefinitions> 3 <RowDefinition Height="72*" /> 4 <RowDefinition Height="696*" /> 5 </Grid.RowDefinitions> 6 <Button Content="Add" Height="72" HorizontalAlignment="Left" Margin="12,0,0,0" Name="button1" VerticalAlignment="Top" Width="160" Click="button1_Click" /> 7 <ListBox Grid.Row="1" Name="listBox1"> 8 <ListBox.ItemTemplate> 9 <DataTemplate> 10 <Grid Width="455" Height="120"> 11 <Grid.ColumnDefinitions> 12 <ColumnDefinition Width="Auto" /> 13 <ColumnDefinition Width="Auto" /> 14 </Grid.ColumnDefinitions> 15 <Image Grid.Column="0" Width="120" Height="120" Stretch="Fill" HorizontalAlignment="Left" VerticalAlignment="Top" Source="{Binding Img}"/> 16 <Grid Grid.Column="1" Name="grid1" > 17 <Grid.RowDefinitions> 18 <RowDefinition Height="60*" /> 19 <RowDefinition Height="60*" /> 20 </Grid.RowDefinitions> 21 <TextBlock Height="30" HorizontalAlignment="Left" Name="textBlock1" VerticalAlignment="Top" Width="332" Text="{Binding Time}" /> 22 <TextBlock Grid.Row="1" Height="30" HorizontalAlignment="Left" Name="textBlock2" Text="{Binding Count}" VerticalAlignment="Top" Width="332" /> 23 </Grid> 24 </Grid> 25 </DataTemplate> 26 </ListBox.ItemTemplate> 27 </ListBox> 28 </Grid>
4 创建Content及ContentCollection类
1) 在界面中,Item模板绑定了3个量Img、Time、Count,对应的我们新建一个Content类
1 using System; 2 using System.Net; 3 using System.ComponentModel; 4 using System.Runtime.Serialization; 5 using System.Collections.ObjectModel; 6 7 namespace PhoneApp1 8 { 9 public class Content 10 { 11 private string time; 12 private string count; 13 private string img; 14 15 public string Time 16 { 17 get { return time; } 18 set 19 { 20 if (time != value) 21 time = value; 22 NotifyPropertyChanged("Time"); 23 } 24 } 25 26 public string Count 27 { 28 get { return count; } 29 set 30 { 31 if (count != value) 32 count = value; 33 NotifyPropertyChanged("Count"); 34 } 35 } 36 37 public string Img 38 { 39 get { return img; } 40 set 41 { 42 if (img != value) 43 img = value; 44 NotifyPropertyChanged("Img"); 45 } 46 } 47 48 public event PropertyChangedEventHandler PropertyChanged; 49 private void NotifyPropertyChanged(string info) 50 { 51 if (PropertyChanged != null) 52 { 53 PropertyChanged(this, new PropertyChangedEventArgs(info)); 54 } 55 } 56 } 57 }
注:其中NotifyPropertyChanged("Img")中的“Img”对应的就是在界面中Source="{Binding Img}"中的Img
2) 然后新建一个ContentCollection类
1 using System; 2 using System.Net; 3 using System.ComponentModel; 4 using System.Runtime.Serialization; 5 using System.Collections.ObjectModel; 6 7 namespace PhoneApp1 8 { 9 public class ContentCollection : ObservableCollection<Content> 10 { 11 public ContentCollection() 12 : base() 13 { 14 } 15 } 16 }
5 写入事件代码
1 public partial class MainPage : PhoneApplicationPage 2 { 3 ContentCollection mySource; 4 int count = 0; 5 // 构造函数 6 public MainPage() 7 { 8 InitializeComponent(); 9 mySource = new ContentCollection(); 10 listBox1.ItemsSource = mySource; 11 } 12 13 private void button1_Click(object sender, RoutedEventArgs e) 14 { 15 Content content = new Content(); 16 content.Img = "http://pic.cnblogs.com/face/u97911.jpg"; 17 content.Time = DateTime.Now.ToString(); 18 content.Count = count.ToString(); 19 count++; 20 mySource.Add(content); 21 } 22 }
6 测试运行
点击Add按钮若干次
说明:
listbox图文混编有几个要点:
1) 设置其Item的样式
2) 创建一个对应的实体数据Content
3) 使用mySource使界面更新