WPF IsEnabled 网格
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WPF IsEnabled Grid
提问by zak zak
I want to get my grid disabled when my property is Null and enabled when is Not null.
我想在我的属性为 Null 时禁用我的网格并在 Not null 时启用。
In my .XAML :
在我的 .XAML 中：
<Grid Grid.Row="2" IsEnabled="{Binding ElementName=dgCustomers, Path=SelectedItem}">
<my:ProductsHistoryDetailView />
</Grid>
In my ViewModel.cs :
在我的 ViewModel.cs 中：
public ProductHistory SelectedItem
{
get { return _SelectedItem; }
set
{
if (_SelectedItem != value)
{
_SelectedItem = value;
RaisePropertyChanged(() => SelectedItem);
}
}
}
回答by Loetn
You should add an extra property to your viewmodel.
您应该为您的视图模型添加一个额外的属性。
public bool IsGridEnabled
{
get
{
return this.SelectedItem != null;
}
}
<Grid Grid.Row="2" IsEnabled="{Binding IsGridEnabled}">
<my:ProductsHistoryDetailView />
</Grid>
And when your SelectedItemchanges, call the OnPropertyChanged event for IsGridEnabled:
当您SelectedItem更改时，调用 OnPropertyChanged 事件IsGridEnabled：
public ProductHistory SelectedItem
{
get { return _SelectedItem; }
set
{
if (_SelectedItem != value)
{
_SelectedItem = value;
RaisePropertyChanged(() => SelectedItem);
RaisePropertyChanged(() => IsGridEnabled);
}
}
}
回答by NebulaSleuth
Use a Style Trigger to change the Enabled Property instead of trying to bind it directly
使用样式触发器更改 Enabled 属性，而不是尝试直接绑定它
<Grid Grid.Row="2">
<Grid.Style>
<Style TargetType="Grid">
<Setter Property="IsEnabled" Value="True"/>
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=dgCustomers, Path=SelectedItem"}" Value={x:Null}>
<Setter Property="IsEnabled" Value="False"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Grid.Style>
</Grid>
回答by McGarnagle
You could use an IValueConverter:
你可以使用一个IValueConverter：
<Grid Grid.Row="2" IsEnabled="{Binding
ElementName=dgCustomers, Path=SelectedItem,
Converter={StaticResource NullToFalseConverter}">
public class NullToFalseConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return value == null ? false : true;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Alternatively, it might be easier to add another property IsSelectedto your view model, which you could bind directly to IsEnabled:
或者，将另一个属性添加IsSelected到您的视图模型可能会更容易，您可以直接绑定到IsEnabled：
public bool IsSelected
{
get { return _isSelected; }
set
{
if (_isSelected != value)
{
_isSelected = value;
RaisePropertyChanged(() => IsSelected);
}
}
}
public ProductHistory SelectedItem
{
get { return _SelectedItem; }
set
{
if (_SelectedItem != value)
{
_SelectedItem = value;
RaisePropertyChanged(() => SelectedItem);
}
IsSelected = value != null;
}
}
回答by Ringo
Please make sure your selectebitem has a valid value like this:
请确保您的 selectebitem 具有如下有效值：
<Grid Grid.Row="2" IsEnabled="{Binding ElementName=dgCustomers, Path=SelectedItem.Value}">
<my:ProductsHistoryDetailView />
</Grid>
