如何使用ViewModel中的GotFocus()和LostFocus()?
private void TxtDescribeGroup_GotFocus(object sender, RoutedEventArgs e)
{
TxtDescribeGroup.BorderBrush = new SolidColorBrush(Colors.Orange);
}
private void TxtDescribeGroup_LostFocus(object sender, RoutedEventArgs e)
{
TxtDescribeGroup.BorderBrush = new SolidColorBrush(Colors.Gray);
}
此代码用Xaml.CS编写。 但我想在ViewModel中编写所有代码。 任何人都让我知道如何在ViewModel中编写事件? 以及如何在ViewBox中为ListBox编写选择更改事件?
private void lstShow_Tap(object sender, GestureEventArgs e)
{
if (lstShow.SelectedItem != null)
{
ListBox item = (ListBox)sender;
LoginPageModel listItem = (LoginPageModel)item.SelectedItem;
MessageBox.Show("Selected FirstName==> " + listItem.FirstName);
}
}
这也是用Xaml.Cs编写的。如何在ViewModel中编写。 提前谢谢..
答案 0 :(得分:0)
在XAML中(假设您已经设置了DataContext
)
<Border BorderBrush="{Binding Path=BorderBrush}">
... your stuff here
</Border>
然后在您的ViewModel中(假设您实现INotifyPropertyChanged
)只需添加一个属性:
private Brush borderBrush;
public Brush BorderBrush {
get { return borderBrush; }
set {
if(value!=borderBrush) {
value=borderBrush;
// this notifies your UI that the property has changed and it should read the new value
// should be already declared in your view model or base view model or whatever
// MVVM framework you are using
OnPropertyChanged("BorderBrush");
}
}
}