WPF MVVM列表框中的多项选择
我有一个包含文件名的列表框。现在我需要从这个列表框中获取所选项目的数组。我在这里找到了一些答案,但没有一个对我有用。我使用的是Caliburn微框架 以下是我的看法:WPF MVVM列表框中的多项选择,wpf,mvvm,listbox,caliburn.micro,multipleselection,Wpf,Mvvm,Listbox,Caliburn.micro,Multipleselection,我有一个包含文件名的列表框。现在我需要从这个列表框中获取所选项目的数组。我在这里找到了一些答案,但没有一个对我有用。我使用的是Caliburn微框架 以下是我的看法: <Window x:Class="ProgramsAndUpdatesDesktop.Views.DeleteHistoryView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schem
<Window x:Class="ProgramsAndUpdatesDesktop.Views.DeleteHistoryView"
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:ProgramsAndUpdatesDesktop.Views"
mc:Ignorable="d"
ResizeMode="CanResizeWithGrip"
MaxWidth="300"
MinWidth="300"
MinHeight="500"
Title="DeleteHistoryView" Height="500" Width="300">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="30" />
</Grid.RowDefinitions>
<StackPanel Grid.Column="0" Grid.Row="0">
<ListBox x:Name="DeleteHistoryListBox" SelectedItem="{Binding Path=DeleteHistorySelectedItem}"
ItemsSource="{Binding DeleteHistoryListBox, NotifyOnSourceUpdated=True}"
SelectionMode="Multiple">
</ListBox>
</StackPanel>
<StackPanel Grid.Column="0" Grid.Row="1">
<Button x:Name="DeleteHistoryButtonAction">Delete</Button>
</StackPanel>
</Grid>
删除
这是我的ViewModel:
class DeleteHistoryViewModel : Screen
{
string historyFolderPath = Environment.ExpandEnvironmentVariables(ConfigurationManager.AppSettings["HistoryFolderPath"]);
private ObservableCollection<string> deleteHistoryListBox = new ObservableCollection<string>();
public ObservableCollection<string> DeleteHistoryListBox
{
get { return deleteHistoryListBox; }
set { deleteHistoryListBox = value; NotifyOfPropertyChange(() => DeleteHistoryListBox); }
}
private List<string> deleteHistorySelectedItem = new List<string>();
public List<string> DeleteHistorySelectedItem
{
get { return deleteHistorySelectedItem; }
set { deleteHistorySelectedItem = value; }
}
public DeleteHistoryViewModel()
{
base.DisplayName = "Delete History";
}
protected override void OnInitialize()
{
FillListBox();
}
private void FillListBox()
{
string[] directory = Directory.GetFiles($"{historyFolderPath}\\", "*.json");
foreach (var item in directory)
{
string fileName = System.IO.Path.GetFileName(item).ToString();
if (!DeleteHistoryListBox.Contains(fileName))
{
DeleteHistoryListBox.Add(fileName);
}
}
}
#region ACTIONS REGION
// DELETE HISTORY ACTION
public void DeleteHistoryButtonAction()
{
foreach (var item in DeleteHistorySelectedItem)
{
MessageBox.Show(item);
}
}
#endregion
}
class DeleteHistoryViewModel:屏幕
{
字符串historyFolderPath=Environment.ExpandEnvironmentVariables(ConfigurationManager.AppSettings[“historyFolderPath”]);
私有ObservableCollection deleteHistoryListBox=新ObservableCollection();
公共可观察收集DeleteHistoryListBox
{
获取{return deleteHistoryListBox;}
设置{deleteHistoryListBox=value;NotifyOfPropertyChange(()=>deleteHistoryListBox);}
}
私有列表deleteHistorySelectedItem=新列表();
公共列表删除历史选择编辑项
{
获取{return deleteHistorySelectedItem;}
设置{deleteHistorySelectedItem=value;}
}
public DeleteHistoryViewModel()
{
base.DisplayName=“删除历史记录”;
}
受保护的重写void OnInitialize()
{
FillListBox();
}
私有void FillListBox()
{
string[]directory=directory.GetFiles($“{historyFolderPath}\\”,“*.json”);
foreach(目录中的var项)
{
string fileName=System.IO.Path.GetFileName(item.ToString();
如果(!DeleteHistoryListBox.Contains(文件名))
{
DeleteHistoryListBox.Add(文件名);
}
}
}
#区域行动区域
//删除历史记录操作
public void DeleteHistoryButtonAction()
{
foreach(DeleteHistorySelectedItem中的变量项)
{
MessageBox.Show(项目);
}
}
#端区
}
您可以将此代码用于MVVM模式
XAML
我面临的问题是,当ListBox中的第二项被选择为“多重选择”时,DeleteHistorySelectedItem不会被调用,我如何确保每次用户在ListBox中进行选择时都会引发此事件?
<ListBox x:Name="DeleteHistoryListBoxItem" SelectedItem="{Binding Path=DeleteHistorySelectedItem,UpdateSourceTrigger=PropertyChanged}"
ItemsSource="{Binding DeleteHistoryListBox, NotifyOnSourceUpdated=True}" SelectionMode="Multiple">
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Item}"/>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="IsSelected" Value="{Binding Mode=TwoWay, Path=IsSelected}"/>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
private ObservableCollection<HistoryItems> deleteHistoryListBox = new ObservableCollection<HistoryItems>();
public ObservableCollection<HistoryItems> DeleteHistoryListBox
{
get
{
return deleteHistoryListBox;
}
set
{
deleteHistoryListBox = value;
this.RaisePropertyChanged("DeleteHistoryListBox");
}
}
private HistoryItems deleteHistorySelectedItem;
public HistoryItems DeleteHistorySelectedItem
{
get
{
return deleteHistorySelectedItem;
}
set
{
var selectedItems = DeleteHistoryListBox.Where(x => x.IsSelected).Count();
this.RaisePropertyChanged("DeleteHistorySelectedItem");
}
}
public class HistoryItems : INotifyPropertyChanged
{
private string item;
public string Item
{
get { return item; }
set
{
item = value;
this.RaisePropertyChanged("Item");
}
}
private bool isSelected;
public bool IsSelected
{
get { return isSelected; }
set
{
isSelected = value;
this.RaisePropertyChanged("IsSelected");
}
}
}