我想在视图模型中传递列表视图复选框的选定项目,稍后我将使用进一步的过程来存储在数据库中。MVVM中的列表视图复选框的选定项目WPF
在FormWeek.xaml守则
守则FormWeek.xaml.cs
private void SelectDays(object sender, SelectionChangedEventArgs e)
{
(this.DataContext as TaskExecDefinitionViewModel).OnCheckBoxCommand(checkedListView.SelectedItems,true);
}
我的视图模型TaskWeek.cs如下
//声明
private RelayCommand<object> _checkBoxCommand;
public ObservableCollection<string> CollectionOfDays { get; set; }
public ObservableCollection<string> SelectedItems { get; set; }
public RelayCommand<object> CheckBoxCommand
{
get
{
if (_checkBoxCommand == null)
{
_checkBoxCommand = new RelayCommand<object>((args) => OnCheckBoxCommand(args,true));
// _checkBoxCommand = new RelayCommand(() => OnCheckBoxCommand(object args));
}
return _checkBoxCommand;
}
}
// Con structor
CollectionOfDays = new ObservableCollection<string>();
//方法
private void GetWeekDays()
{
try
{
Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() =>
{
CollectionOfDays.Add("Saturday");
CollectionOfDays.Add("Sunday");
CollectionOfDays.Add("Monday");
CollectionOfDays.Add("Tuesday");
CollectionOfDays.Add("Wednesday");
CollectionOfDays.Add("Thursday");
CollectionOfDays.Add("Friday");
}));
}
catch(Exception Ex)
{
MessageBox.Show(Ex.Message, "TaskWeek:GetWeekDays");
}
}
public void OnCheckBoxCommand(object obj, bool _direction)
{
try
{
if (SelectedItems == null)
SelectedItems = new ObservableCollection<string>();
if (obj != null)
{
SelectedItems.Clear();
StringBuilder items = new StringBuilder();
if (_direction)
{
foreach (string item in CollectionOfDays)
{
items.AppendFormat(item + ",");
}
}
MessageBox.Show(items.ToString());
}
else
SelectedItems.Clear();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "TaskDefinition:OnCheckBoxCommand");
}
}
及以下按钮点击commond保存数据。
<Button Grid.Column="2" Grid.Row="2" Content="Save" HorizontalAlignment="Center" VerticalAlignment="Bottom"
Command="{Binding InsertExecDefCommand}" Margin="5" >
现在我的要求是通过选定的列表视图项目通过命令对象查看模型。我已通过SelectionChanged事件做过FormWeek.xam.cs这个使用下面的代码作为
private void OnSelectedItems(object sender, RoutedEventArgs e)
{
StringBuilder items = new StringBuilder();
foreach (string item in checkedListView.SelectedItems)
{
items.AppendFormat(item + ",");
}
string AllDays= items.ToString();
}
但是请让我知道如何实现通过MVVM这个逻辑。如何在我的视图模型中获取选定项目TaskWeek.cs
之后R & D和谷歌我通过RelayCommand完成了chages。在OnCheckBoxCommand方法中,foreach语句是错误的,它传递所有日子。我只想传递选定的listview项目。请建议我在OnCheckBoxCommand方法中出了什么问题。
请让我知道在哪里可以使用CommandHandler。 – Hussain 2013-02-24 13:58:46
CommandHandler是我的自定义类,它实现了ICommand,如果你想使用命令你必须知道这一点,它可以在网上或你可以使用RelayCommand。 – ethicallogics 2013-02-24 14:33:54
谢谢你的想法很有帮助。 – Hussain 2013-03-04 13:17:56