List View Selected Item Binding in wpf mvvm - wpf

Question

I am using a ListView in wpf mvvm pattern whose SelectedItem binding is done to the ViewModel. The problem what I am facing is as soon as I check the checkbox, The SelectedItem binding is not working immediately. It work only when I click again somewhere outside the checkbox and its respective content.
My ListView is like this:
<Grid>
<Grid.Resources>
<DataTemplate x:Key="checkboxHeaderTemplate">
<CheckBox IsChecked="{Binding Path=DataContext.AllSelected,RelativeSource={RelativeSource AncestorType=UserControl },Mode=TwoWay}">
</CheckBox>
</DataTemplate>
<DataTemplate x:Key="CheckBoxCell">
<!--<CheckBox Checked="CheckBox_Checked" />-->
<CheckBox IsChecked="{Binding Path=IsSelected, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" >
</CheckBox>
</DataTemplate>
<DataTemplate x:Key="TextCell">
<TextBlock Text="Usecasename">
</TextBlock>
</DataTemplate>
<DataTemplate x:Key="ButtonCell">
<Button Content="{Binding Path=UsecaseName, Mode=TwoWay}" >
</Button>
</DataTemplate>
</Grid.Resources>
<ListView SelectedItem="{Binding SelectedSection}" ItemsSource="{Binding Path=UsecaseListItems}" >
<ListView.View>
<GridView>
<GridView.Columns>
<GridViewColumn HeaderTemplate="{StaticResource checkboxHeaderTemplate}"
CellTemplate="{StaticResource CheckBoxCell}" Width="auto">
</GridViewColumn>
<GridViewColumn HeaderTemplate="{StaticResource TextCell}"
CellTemplate="{StaticResource ButtonCell}" Width="auto">
</GridViewColumn>
</GridView.Columns>
</GridView>
</ListView.View>
</ListView>
</Grid>
The HomeViewModel with which I am binding the Selected itm of List View is like this:
private UseCase _selectedSection;
public UseCase SelectedSection
{
get { return _selectedSection; }
set
{
_selectedSection = value;
if (this.SelectedSection.UsecaseName == ("CCS01") && (this.SelectedSection.IsSelected == true))
{
this.ContentWindow = new CCS01();
}
else if (this.SelectedSection.UsecaseName == ("CCS02") && (this.SelectedSection.IsSelected == true))
{
this.ContentWindow = new CCS02();
}
else if (this.SelectedSection.UsecaseName == ("ECS52") && (this.SelectedSection.IsSelected == true))
{
this.ContentWindow = new ECS52();
}
else
this.ContentWindow = new Default();
OnPropertyChanged("SelectedSection");
}
}
and The UseCase class is this:
public class UseCase: BaseNotifyPropertyChanged
{
public string UsecaseName { get; set; }
private bool _IsSelected;
public bool IsSelected
{
get { return _IsSelected; }
set
{
_IsSelected = value;
OnPropertyChanged("IsSelected");
}
}
}
Please suggest what correction should I do so that, It should hit the binding directly as I check the Checkboxes.

Answer 1

You should change the checkbox binding of the CheckBoxCell to something like this :
<DataTemplate x:Key="CheckBoxCell">
<!--<CheckBox Checked="CheckBox_Checked" />-->
<CheckBox IsChecked="{Binding Path=IsSelected,
RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type ListViewItem}},
Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" >
</CheckBox>
</DataTemplate>
And for this work you need to put SelectionMode to Single
<ListView SelectedItem="{Binding SelectedSection}"
ItemsSource="{Binding Path=UsecaseListItems}" SelectionMode="Single">
And do this in your viewmodel
private UseCase _selectedSection;
public UseCase SelectedSection
{
get { return _selectedSection; }
set
{
DeSelectAll();
_selectedSection = value;
_selectedSection.IsSelected = true;
OnPropertyChanged("SelectedSection");
}
}
private void DeSelectAll()
{
foreach (var item in UsecaseListItems)
{
item.IsSelected = false;
}
}