我是不是100%确定你在这里问的是什么,但我会继续努力。它看起来像你试图添加更多的行到DataGrid,但只有新的项目正在显示。
这是因为您正在更改DataGrid的ItemsSource属性,如果您希望将新项目添加到底部,那么ItemsSource需要保持不变,并添加新行。
这可以使用DataGrid上的Items.Add()方法完成,循环遍历数据行并为每个数据行调用add,或者您可以创建一个只需双击就添加的项目集合,I在这里提供了第二个例子。
像你的应用程序一样,它显示一个ListBox和一个DataGrid,每次你双击列表框中的一个项目时,会有更多的行被添加到DataGrid中。
XAML
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
DataContext="{Binding RelativeSource={RelativeSource Self}}"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<ListBox Grid.Column="0" ItemsSource="{Binding Items}" MouseDoubleClick="ListBox_MouseDoubleClick"/>
<DataGrid Grid.Column="1" ItemsSource="{Binding GridItems}">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding}"/>
</DataGrid.Columns>
</DataGrid>
</Grid>
</Window>
代码背后
using System;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Input;
namespace WpfApplication1
{
public partial class MainWindow : Window
{
// This collection is bound to the ListBox so there are items to select from.
public ObservableCollection<object> Items
{
get { return (ObservableCollection<object>)GetValue(ItemsProperty); }
set { SetValue(ItemsProperty, value); }
}
public static readonly DependencyProperty ItemsProperty =
DependencyProperty.Register("Items", typeof(ObservableCollection<object>), typeof(MainWindow), new PropertyMetadata(null));
// On double click of each item in the ListBox more items will be added to this collection.
public ObservableCollection<object> GridItems
{
get { return (ObservableCollection<object>)GetValue(GridItemsProperty); }
set { SetValue(GridItemsProperty, value); }
}
public static readonly DependencyProperty GridItemsProperty =
DependencyProperty.Register("GridItems", typeof(ObservableCollection<object>), typeof(MainWindow), new PropertyMetadata(null));
public MainWindow()
{
InitializeComponent();
// Some demo items so we can double click.
Items = new ObservableCollection<object>();
Items.Add("test item 1");
Items.Add("test item 2");
Items.Add("test item 3");
Items.Add("test item 4");
Items.Add("test item 5");
Items.Add("test item 6");
Items.Add("test item 7");
GridItems = new ObservableCollection<object>();
}
private void ListBox_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
// These would be the entries from your database, I'm going to add random numbers.
Random rnd = new Random();
for (int i = 0; i < rnd.Next(5); i++)
GridItems.Add(rnd.Next(100));
}
}
}
请有人回复 – user2568244