在WPF c#中使用数据绑定改变组合框的选定索引
本文关键字:组合 索引 改变 数据绑定 WPF | 更新日期: 2023-09-27 18:06:59
我正试图在c#中从Winforms
转换为WPF
。我有点挣扎与WVVM
和data binding
。我承认我并没有完全掌握每件事是如何一起工作的,但我想我只是需要更多的练习。
虽然我可以得到数据绑定工作与int和字符串我挣扎与一个组合框。数据存储在xml文件中,并作为字符串和整型存储在contacts类中。当从列表框中选择位置时,组合框应该自动更新。我让这些都用于允许用户自定义信息的属性。这个特定的设置需要是预设值的下拉菜单。
如何转换字符串并通过数据绑定将SelectedIndex[]属性传递给comboBox ?
我省略了一些用于文本框字符串填充的额外工作代码,以清理它。
XAML
<Window
<Window.DataContext>
<viewmodels:mainviewModel x:Name="viewModel1"/>
</Window.DataContext>
<Grid Background="#FF8B8686">
<ListBox x:Name="listBox" HorizontalAlignment="Left" Height="174" Margin="44,77,0,0" VerticalAlignment="Top" Width="164" ItemsSource="{Binding Contacts}" DisplayMemberPath="Name" SelectedItem="{Binding SelectedContact}" SelectionChanged="listBox_SelectionChanged" />
<TextBox x:Name="textBoxName" HorizontalAlignment="Left" Height="23" Margin="244,77,0,0" TextWrapping="Wrap" Text="{Binding SelectedContact.Name}" VerticalAlignment="Top" Width="120"/>
<TextBox x:Name="textBoxAddress" HorizontalAlignment="Left" Height="23" Margin="244,120,0,0" TextWrapping="Wrap" Text="{Binding SelectedContact.Address}" VerticalAlignment="Top" Width="120"/>
<TextBox x:Name="textBoxBandwidth" HorizontalAlignment="Left" Height="23" Margin="244,198,0,0" TextWrapping="Wrap" Text="{Binding SelectedContact.Bandwidth}" VerticalAlignment="Top" Width="120" DataContext="{Binding Mode=OneWay}"/>
<Button x:Name="button1" Content="Write Data" HorizontalAlignment="Left" Margin="194,271,0,0" VerticalAlignment="Top" Width="75" Click="button1_Click"/>
<ComboBox x:Name="comboBox" HorizontalAlignment="Left" Margin="267,229,0,0" VerticalAlignment="Top" Width="120" SelectedItem="{Binding SelectedContact.Combo}">
<ComboBoxItem Content="1" />
<ComboBoxItem Content="2" />
<ComboBoxItem Content="3" />
<ComboBoxItem Content="4" />
</ComboBox>
</Grid>
</Window>
Contact.cs
public class Contact : ViewModelEntity
{
public Contact()
{
}
protected int combo;
public int Combo
{
get { return combo; }
set
{
if (combo != value)
{
switch (value)
{
case 1:
combo = ComboBox.SelectedIndex[0];
break;
case 2:
combo = ComboBox.SelectedIndex[1];
break;
case 3:
combo = ComboBox.SelectedIndex[2];
break;
case 4:
combo = ComboBox.SelectedIndex[3];
break;
default:
combo = ComboBox.SelectedIndex[0];
break;
}
// combo = value;
NotifyPropertyChanged("Combo");
}
}
}
mainviewModel.cs
using System.Collections.ObjectModel;
namespace WpfApplication1.viewmodels
{
public class mainviewModel:ViewModelEntity
{
public mainviewModel()
{ }
protected Contact selectedContact = null;
protected ObservableCollection<Contact> contacts = new ObservableCollection<Contact>();
public ObservableCollection<Contact> Contacts
{
get { return contacts; }
set { contacts = value; }
}
public Contact SelectedContact
{
get { return selectedContact; }
set {
if (selectedContact != value)
{
selectedContact = value;
NotifyPropertyChanged("SelectedContact");
}
}
}
}
}
为什么不直接绑定到SelectedIndex
呢?
<ComboBox x:Name="comboBox"
Width="120"
Margin="267,229,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
SelectedIndex="{Binding SelectedContact.Combo}">
<ComboBoxItem Content="1" />
<ComboBoxItem Content="2" />
<ComboBoxItem Content="3" />
<ComboBoxItem Content="4" />
</ComboBox>
后面的代码:
protected int combo;
public int Combo
{
get { return combo; }
set
{
combo = value;
NotifyPropertyChanged("Combo");
}
}