How to set SelectedItem in listview control? - wpf

Question

I have UserControl(AllCustomerView) in project and its Viewmodel as ALlCustomerViewModel consists a property as SearchText.
SearchText is selected value for TextBox inside a listview in UserControl.
SearchItem is set as customerViewmdel for SearchText.
But in listview , SearchItem is not set as selected
in AllCustomerView.xaml
<TextBlock>
<TextBox
Width="150"
Text="{Binding Path=SearchText, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}">
</TextBox>
<Button
Command="{Binding Path=SearchCommand}"
Content=" Search ">
</Button>
</TextBlock>
<ListView
SelectedValue="{Binding Path=SearchText}"
ItemsSource="{Binding Path=AllCustomers}"
FontFamily="Tahoma"
FontSize="14"
ItemContainerStyle="{StaticResource CustomerItemStyle}"
IsSynchronizedWithCurrentItem="True">
<ListView.View>
<GridView>
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button
Command="{Binding ElementName=Root, Path=DataContext.DeleteCommand}"
Content="x"
FontFamily="Tahoma"
FontSize="10"
/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<Button
FontFamily="Tahoma"
FontSize="10"
Content="Edit"
Command="{Binding Path=DataContext.Editcommand,ElementName=Root}"
/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn
Header="CustomerID"
Width="130"
DisplayMemberBinding="{Binding Path=CustomerID}"/>
<GridViewColumn
Header="Contact Name"
Width="130"
DisplayMemberBinding="{Binding Path=ContactName}"/>
<GridViewColumn
Header="Company Name"
Width="130"
DisplayMemberBinding="{Binding Path=CompanyName}"/>
<GridViewColumn
Width="130"
Header="Contact Name"
DisplayMemberBinding="{Binding Path=ContactTitle}"
/>
</GridView>
</ListView.View>
</ListView>
and its viewmodel(AllcustomerViewModel.cs)
public ICommand SearchCommand
{
get
{
if (_search == null)
_search = new Relaycommand(SearchCustomer);
return _search;
}
}
public void SearchCustomer(object o)
{
System.Windows.Forms.MessageBox.Show(SearchItem.ToString());
}
public string searchText;
public string SearchText
{
get { return searchText; }
set
{
searchText = value;
var customerExsits = AllCustomers.Where(q => q.CustomerID.Trim().Equals(searchText));
if (customerExsits.Any())
{
SearchItem = customerExsits.Single();
}
}
}
public CustomerViewModel SearchItem
{
get;
set;
}
what should i set in SelectedValue in ListView, whether to set Customerviewmodel(as SelectedItem) or to set CustomerID(as SearchText)?

Answer 1

You should do the following:
Use this binding in your ListView: SelectedItem="{Binding Path=SearchItem }". Don't use SelectedValue.
Implement INotifyPropertyChanged in your ViewModel and raise the PropertyChanged event in the setter of the SearchItem property. Obviously, you need to change this property from an automatic one to a classical one with a backing field:
public CustomerViewModel SearchItem
{
get { return _searchItem; }
set
{
if(value == _searchItem)
return;
_searchItem = value;
RaisePropertyChanged("SearchItem");
}
}