WPF 绑定各种数据源之Datatable
一、Binding是WPF的核心，WPF的数据源有以下几种：
1、ADO.NET中的DataTable
2、xml数据源
3、object数据源
4、元素控件属性
二、WPF绑定各种数据源索引
三、这里做一些简单的实例。
1.ListBox绑定Datatable数据源
前台代码
<ListBox Margin="12,32,12,329" ItemsSource="{Binding}" Name="listBox1">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.5*"/>
<ColumnDefinition Width="0.5*"/>
<ColumnDefinition Width="0.5*"/>
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding Path=ID}"/>
<TextBlock Text="{Binding Path=Name}"/>
<TextBlock Grid.Column="1" Text="{Binding Path=Age}" Background="{Binding Path=Age, Converter={StaticResource BackgroundConverter}}"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
后台代码：
public Window1()
{
InitializeComponent();
listBox1.DataContext = GetDataTable();
//使用ItemsSource的形式
//listBox1.ItemsSource = GetDataTable().DefaultView;
listBox1.SelectedIndex = 0;
}
下面是创建DataTable数据源，当然也可以连接数据库获得数据源
private DataTable GetDataTable()
{
DataTable data = new DataTable("MyDataTable");
DataColumn ID = new DataColumn("ID");//第一列
ID.DataType = System.Type.GetType("System.Int32");
//ID.AutoIncrement = true; //自动递增ID号
data.Columns.Add(ID);
//设置主键
DataColumn[] keys = new DataColumn[1];
keys[0] = ID;
data.PrimaryKey = keys;
data.Columns.Add(new DataColumn("Name",typeof(string)));//第二列
data.Columns.Add(new DataColumn("Age",typeof(string)));//第三列
data.Rows.Add(1," XiaoM"," 20");
data.Rows.Add(2," XiaoF"," 122");
data.Rows.Add(3," XiaoA", " 29");
data.Rows.Add(4," XiaoB", " 102");
return data;
}
下面是类型转换
public class BackgroundConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
Color color = new Color();
int num = int.Parse(value.ToString());
if (num > 100)
color = Colors.Yellow;
else if (num < 50)
color = Colors.LightGreen;
else
color = Colors.LightPink;
return new SolidColorBrush(color);
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
#endregion
}
效果图：
2、使用ListView的形式绑定DataTable数据源，数据源与第一个是一样的，不同的地方是：
前台代码：
<ListView Height="262" Margin="-12,0,12,39" VerticalAlignment="Bottom" ItemsSource="{Binding}" Name="listView2" HorizontalAlignment="Center">
<ListView.View>
<GridView>
<GridViewColumn Header="编号" DisplayMemberBinding="{Binding Path=ID}" Width="100" />
<GridViewColumn Header="姓名" DisplayMemberBinding="{Binding Path=Name}" Width="100"/>
<GridViewColumn Header="年龄" Width="100">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Grid.Column="1" Text="{Binding Path=Age}" Foreground="{Binding Path=Age, Converter={StaticResource BackgroundConverter}}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
后台代码：
listView2.DataContext = GetDataTable().DefaultView;
效果图：
3、如果数据源已经是DataTable，则使用LINQ检索结果的形式为:
DataTable dt = GetDataTable();
listView2.ItemsSource =
from row in dt.Rows.Cast<DataRow>()
where Convert.ToString(row["Name"]).StartsWith("XiaoF")
select new Student()
{
ID = int.Parse(row["ID"].ToString()),
Name = row["Name"].ToString(),
Age = row["Age"].ToString()
};
其它不变.上面的代码是检索Name以XiaoF开始的数据，只有一条数据。 效果图如下:
