In WPF we are going to see a Combo Box with custom template ,Which have a checkbox in it.To have a CheckBox in Combo we have to define the item template.
This example consists of a Select the value and retrieve the value selected in combobox and display in textbox.
Example consists of days are the item of combobox.
<window height="177" title="TestWindow" width="378" x:class="sample_wpf.MainWindow" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
<stackpanel>
<combobox height="30" margin="10,10,10,10" name="customcombo" selectionchanged="customcombo_SelectionChanged" width="116">
<combobox .itemtemplate="">
<datatemplate>
<stackpanel orientation="Horizontal">
<checkbox checked="CheckBox_Checked" content="{Binding Data}" ischecked="{Binding IsSelected,Mode=TwoWay}" margin="0,2,3,2" unchecked="CheckBox_Unchecked"></checkbox>
</stackpanel>
</datatemplate>
</combobox>
</combobox>
<button click="Button_Click" width="117">Get Selected value</button>
<textblock height="30" margin="20,20,20,20" name="val"></textblock>
</stackpanel>
</window>
Now when we select the values in combobox, we have to ensure that for select all options all items in combobox should be selected.
public partial class MainWindow :
Window
{
DaysCollection dc = new
DaysCollection();
public MainWindow()
{
InitializeComponent();
dc.Add(new ComboTemplate<string>(false, "Select All"));
dc.Add(new ComboTemplate<string>(false, "Sunday"));
dc.Add(new ComboTemplate<string>(false, "Monday"));
dc.Add(new ComboTemplate<string>(false, "Tuesday"));
dc.Add(new ComboTemplate<string>(true, "Wednesday"));
dc.Add(new ComboTemplate<string>(false, "Thursday"));
dc.Add(new ComboTemplate<string>(false, "Friday"));
dc.Add(new ComboTemplate<string>(false, "Saturday"));
customcombo.ItemsSource = dc;
}
private void
CheckBox_Checked(object sender, RoutedEventArgs e)
{
CheckBox _selectall = sender as CheckBox;
if(_selectall.IsChecked.HasValue)
if (_selectall.IsChecked.Value &&
_selectall.Content == "Select All")
{
foreach (ComboTemplate<string> _val in
dc)
{
_val.IsSelected = true;
}
}
}
private void
CheckBox_Unchecked(object sender, RoutedEventArgs e)
{
CheckBox _selectall = sender as CheckBox;
if (_selectall.IsChecked.HasValue)
if (!_selectall.IsChecked.Value
&& _selectall.Content == "Select
All")
{
foreach (ComboTemplate<string> _val in
dc)
{
_val.IsSelected = false;
}
}
}
private void
customcombo_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
}
private void
Button_Click(object sender, RoutedEventArgs e)
{
val.Text = "";
List<string>
daysselected = new List<string>();
foreach (ComboTemplate<string> _selected in
customcombo.ItemsSource)
{
if (_selected.IsSelected)
{
if (_selected.Data != "Select All")
val.Text +=
_selected.Data+", ";
}
}
if (val.Text.Length > 0)
{
val.Text = val.Text.Substring(0, val.Text.Length - 2);
}
}
}
class DaysCollection
: ObservableCollection<ComboTemplate<string>>
{
}
class ComboTemplate<T>
: INotifyPropertyChanged
{
private bool
_IsSelected;
public bool
IsSelected
{
set
{
if (IsSelected != value)
{
_IsSelected = value;
OnPropertyChange("IsSelected");
}
}
get
{
return _IsSelected;
}
}
public T Data { set; get; }
public ComboTemplate(T data)
{
Data = data;
}
public ComboTemplate(bool
isSelected,T data)
{
_IsSelected = isSelected;
Data = data;
}
public event PropertyChangedEventHandler PropertyChanged;
private void
OnPropertyChange(string propertyname)
{
PropertyChangedEventHandler handler =
PropertyChanged;
if (handler != null)
{
handler(this, new
PropertyChangedEventArgs(propertyname));
}
}
}
