我需要在每个ListViewItem
中都有一个按钮。我已经在Button
中创建了DataTemplate
,并绑定了该命令,当我按下按钮时该命令不会执行。只是没有被调用。
我指的是不同的教程和问题,例如
WPF Button doesn't execute Command或How to bind WPF button to a command in ViewModelBase?,并创建了一个RelayCommand类,该类实现了ICommand
。
实际上,我需要使用参数调用该动作,但是我什至不能在没有参数的情况下使它起作用,因此我打算下一步进行操作。其他所有东西都完美地结合在一起,就像魅力一样。
查看
<Page.Resources>
<CollectionViewSource x:Key='src'
Source="{Binding TimesheetEntries}"
>
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="Date" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</Page.Resources>
<Page.DataContext>
<ViewModels:TimesheetViewModel/>
</Page.DataContext>
<ListView
x:Name="TimesheetEntriesListView"
Margin="10"
Grid.Row="1"
Grid.ColumnSpan="2"
ItemsSource="{Binding Source={StaticResource src}}"
SelectedItem="{Binding SelectedEntry, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
>
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Height="30" Margin="3" IsEnabled="{Binding IsEditable}">
<ComboBox
SelectedValuePath="Key" DisplayMemberPath="Value"
ItemsSource="{Binding EmploymentTypesDictionary, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectedValue="{Binding SelectedEmployment, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
Width="300"/>
<TextBox
Text="{Binding Hours, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, StringFormat=N2}"
Margin="5,0,0,0"
Height="Auto"
IsEnabled="{Binding HoursAvaliable}"
Width="70"/>
<Button Margin="5,0,10,0"
Content="+"
Command="{Binding AddNewTimesheetEntryCommand}"
CommandParameter="{Binding Path=Name}"
></Button>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<StackPanel Margin="5,5,5,0" Orientation="Horizontal">
<TextBlock FontSize="14" Text="{Binding Path=Name, StringFormat='{}{0:dd/MM/yyyy, dddd}'}"/>
</StackPanel>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
ViewModel
class TimesheetViewModel : BaseViewModel
{
public ICommand AddNewTimesheetEntryCommand
{
get
{
return _AddNewTimesheetEntryCommand ?? new RelayCommand(AddNewTimesheetEntry);
}
}
private ICommand _AddNewTimesheetEntryCommand;
public void AddNewTimesheetEntry(object parameter)
{
//Do stuff
}
public TimesheetViewModel()
{
}
}
RelayCommand
public class RelayCommand : ICommand
{
private Action<object> mAction;
public event EventHandler CanExecuteChanged = (sender, e) => { };
public RelayCommand(Action<object> action)
{
mAction = action;
}
public bool CanExecute(object parameter)
{
return true;
}
public void Execute(object parameter)
{
mAction(parameter);
}
}
答案 0 :(得分:1)
您的按钮需要进行不同的绑定,因为在列表模板内部您不能访问全局DataContext,而只能访问本地。您需要使用相对源来访问全局DataContext。
Command="{Binding Path=DataContext.AddNewTimesheetEntryCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Page}}}"