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[英]How to show in a listbox the properties of a class selected by name in another listbox
[英]How to show properties of listbox selected item in different controls
在我的应用程序中,我有一个包含ListBox
的窗口,以及应显示其当前所选项目的不同属性的控件。 这些控制是:
TextBox
。TextBox
。DataGrid
应该显示 'TItems 属性,它是一个ObservableCollection
。 我尝试将SelectedItem
绑定到一个对象,然后将该对象的不同属性绑定到上面提到的控件,但没有成功。
窗户:
我的看法:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:ReportMaker"
xmlns:ViewModel="clr-namespace:ReportMaker.ViewModel" x:Class="ReportMaker.MainWindow"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
<ViewModel:MainViewModel/>
</Window.DataContext>
<Grid>
<Button x:Name="button" Content="Create" HorizontalAlignment="Right" Margin="0,0,10,10" VerticalAlignment="Bottom" Width="75"/>
<ComboBox x:Name="comboBox" HorizontalAlignment="Left" Margin="10,0,0,10" VerticalAlignment="Bottom" Width="120"/>
<ListBox x:Name="listBox" HorizontalAlignment="Left" Margin="10,10,0,36.667" Width="119" ItemsSource="{Binding ReportItems}" >
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<StackPanel HorizontalAlignment="Left" Height="274" Margin="134,10,0,0" VerticalAlignment="Top" Width="375" DataContext="{Binding SelectedReportItem}">
<StackPanel.Resources>
<Style x:Key="ControlBaseStyle" TargetType="{x:Type Control}">
<Setter Property="Margin" Value="0, 10, 0, 0" />
</Style>
</StackPanel.Resources>
<StackPanel Orientation="Horizontal">
<TextBlock Text="Name:"/>
<TextBox Width="150" Text="{Binding Name}"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock Text="Data File:"/>
<TextBox Width="150" Text="{Binding ID}"/>
</StackPanel>
<DataGrid Height="190" VerticalAlignment="Bottom" ItemsSource="{Binding TItems}"/>
</StackPanel>
<Button x:Name="button_Copy" Content="Save" HorizontalAlignment="Right" Margin="0,0,92,10" VerticalAlignment="Bottom" Width="75"/>
</Grid>
</Window>
我的视图模型:
public class MainViewModel
{
public ObservableCollection<ReportItem> ReportItems { get; set; }
public object SelectedReportItem { get; set; }
public MainViewModel()
{
ReportItems = new ObservableCollection<ReportItem>();
ReportItems.Add(Example);
}
public ReportItem Example = new TextReportItem() { Name = "John", DataFile = "try.txt"};
}
报告项目:
public class ReportItem
{
public int Id { get; set; }
public string Name { get; set; }
public string DataFile { get; set; }
}
文本报告项:
public class TextReportItem : ReportItem
{
public ObservableCollection<TextParcel> TItems { get; set; }
}
public class TextParcel
{
char Delimiter { get; set; }
string LineExp { get; set; }
string Result { get; set; }
string IgnoreLine { get; set; }
int DesiredResultIndexInLine { get; set; }
}
编辑:当我使用 MVVM 时,我更喜欢在视图中只使用 XAML,没有代码。
编辑2:
感谢 S.Akbari,我成功地在TextBox
控件中查看了所需的属性,代码如下:
<StackPanel Orientation="Horizontal">
<TextBlock Text="Name:"/>
<TextBox Width="150" Text="{Binding ElementName=listBox, Path=SelectedItem.Name}"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock Text="Data File:"/>
<TextBox Width="150" Text="{Binding ElementName=listBox, Path=SelectedItem.DataFile}"/>
</StackPanel>
但是当相同的逻辑应用于我的DataGrid
,由于某种原因它失败了:
<DataGrid Height="190" VerticalAlignment="Bottom" ItemsSource="{Binding ElementName=listBox, Path=SelectedItem.TItmes}" />
我也试过:
<DataGrid Height="190" VerticalAlignment="Bottom" DataContext="{Binding ElementName=listBox, Path=SelectedItem}" ItemsSource="{Binding TItems}"/>
并且:
<DataGrid Height="190" VerticalAlignment="Bottom" DataContext="{Binding ElementName=listBox, Path=SelectedItem}">
<DataTemplate>
<TextBlock Text="{Binding TItems}" />
</DataTemplate>
</DataGrid>
如果您使用 MVVM,您的视图模型应该引发属性更改事件
您应该实现 INotifyPropertyChanged 并将所选项目更改为完整属性,请参阅:如何:实现属性更改通知
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