I’m attempting to build a CheckedListBox in WPF and bind it to the user settings so that it is constructed once only and then updates the settings automatically in XAML using ListBox ItemsSource="{Binding Source={x:Static local:Settings.Default}, Path=Customers, Mode=TwoWay}
I can see the checkboxes but they don’t show the Customer name and don’t retain their values in settings. Is anyone able to spot why?
I think I may need to cast from the settings to the current Customers ObservableCollection but can’t get this working?
Customers = Properties.Settings.Default.Customers.Cast;
TestSettings.xaml
<Window x:Class="WpfApplication1.TestSettings"
xmlns:local="clr-namespace:WpfApplication1.Properties"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="TestSettings" Height="300" Width="300">
<Grid>
<ListBox ScrollViewer.VerticalScrollBarVisibility="Auto" ItemsSource="{Binding Source={x:Static local:Settings.Default}, Path=Customers, Mode=TwoWay}" Margin="12,22,12,79">
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding IsChecked}" Content="{Binding Path=Item.CustomerName}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</Window>
TestSettings.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Collections.ObjectModel;
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for TestSettings.xaml
/// </summary>
public partial class TestSettings : Window
{
public ObservableCollection<CheckedListItem<Customer>> Customers { get; set; }
public class Customer
{
public string CustomerName { get; set; }
}
public TestSettings()
{
InitializeComponent();
if (Properties.Settings.Default.Customers == null)
{
Properties.Settings.Default.Customers = new ObservableCollection<Customer>
{
new Customer() { CustomerName = "Kelly Smith" },
new Customer() { CustomerName = "Joe Brown" },
new Customer() { CustomerName = "Herb Dean" }
//Customers.Add(new CheckedListItem<Customer>(new Customer(){CustomerName="Kelly Smith"}));
//Customers.Add(new CheckedListItem<Customer>(new Customer(){CustomerName="Joe Brown"}));
//Customers.Add(new CheckedListItem<Customer>(new Customer(){CustomerName="Herb Dean"}));
};
Properties.Settings.Default.Save();
}
else
{
// Customers = (ObservableCollection<Customer>)Properties.Settings.Default.Customers;
}
}
public class CheckedListItem<T> : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private bool isChecked;
private T item;
public CheckedListItem()
{ }
public CheckedListItem(T item, bool isChecked = false)
{
this.item = item;
this.isChecked = isChecked;
}
public T Item
{
get { return item; }
set
{
item = value;
if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Item"));
}
}
public bool IsChecked
{
get { return isChecked; }
set
{
isChecked = value;
if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("IsChecked"));
}
}
}
private void Window_Closing(object sender, CancelEventArgs e)
{
Properties.Settings.Default.Save();
}
}
}
Settings.Designer.cs
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by a tool.
// Runtime Version:4.0.30319.269
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
using System.Collections.ObjectModel;
namespace WpfApplication1.Properties
{
[global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
[global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "10.0.0.0")]
internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase
{
private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
public static Settings Default
{
get
{
return defaultInstance;
}
}
[global::System.Configuration.UserScopedSettingAttribute()]
[global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
public ObservableCollection<WpfApplication1.TestSettings.Customer> Customers
{
get
{
return ((ObservableCollection<WpfApplication1.TestSettings.Customer>)(this["Customers"]));
}
set
{
this["Customers"] = value;
}
}
}
}
OK – Sorted.
There were 2 main problems
1/ I was only adding CustomerName and not the CheckListItem so
ObservableCollection<Customer>should beObservableCollection<CheckedListItem<Customer>>2/ Same again adding the customers.
new Customer() { CustomerName = "Kelly Smith" }should benew CheckedListItem<Customer>(new Customer() { CustomerName = "Kelly Smith" })So full working code is
Settings.Designer.cs
TestSettings.xaml
TestSettings.xaml.cs
EDIT: It appears that this does work but as the
Settings.Designer.cshas been amended the settings don’t persist between separate run-times as generic types cannot be stored in the settings. Rather than change Settings.Designer.cs I’ve ended up created and XML string which gets saved in the settings as a string and then build ObservableCollection> from the XML and vice versa.