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POListbox bound to an ObservableCollection doesn't update
 

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    <p>I am using a ObservableCollection to store the Environment Variables of Windows.</p> <pre><code>class VariableVieWModel { ObservableCollection&lt;VariableModel&gt; vars; public ObservableCollection&lt;VariableModel&gt; Variables { get { return vars; } set { vars = value; } } public VariableViewModel() { Reload(); } public void Reload() { // Code to retrieve vars } } </code></pre> <p>This ObservableCollection is bound to a ListBox.</p> <p>I have added a button in the GUI to reload the Variables whichi, on click, it calls the Reload() procedure.</p> <p>ListBox content, however, does not change and I cannot add anymore items to the list afer calling Reload().</p> <p>Under the constructor everything is working fine.</p> <p>ListBox XAML :</p> <pre><code>&lt;ListBox x:Name="lbVariables" Grid.Column="0" Margin="0,0,5,0" ItemsSource="{Binding Source={StaticResource variablesViewModel}, Path=Variables}" IsSynchronizedWithCurrentItem="True"&gt; </code></pre> <p>I tried using also PropertyChanged as UpdateSource trigger and set most of the Modes.</p> <pre><code>public void Reload() { vars = new ObservableCollection&lt;VariableModel&gt;(); RegistryKey systemVarKey = Registry.LocalMachine.OpenSubKey(@"SYSTEM\CurrentControlSet\Control\Session Manager\Environment"); string[] systemVars = systemVarKey.GetValueNames(); foreach (string var in systemVars) { vars.Add(new VariableModel() { Name = var, Values = (systemVarKey.GetValue(var, null, RegistryValueOptions.DoNotExpandEnvironmentNames) as string).Split(';').ToList&lt;string&gt;(), Target = EnvironmentVariableTarget.Machine }); } systemVarKey.Close(); RegistryKey userVarKey = Registry.CurrentUser.OpenSubKey(@"Environment"); string[] userVars = userVarKey.GetValueNames(); foreach (string var in userVars) { vars.Add(new VariableModel() { Name = var, Values = (userVarKey.GetValue(var, null, RegistryValueOptions.DoNotExpandEnvironmentNames) as string).Split(';').ToList&lt;string&gt;(), Target = EnvironmentVariableTarget.User }); } userVarKey.Close(); } </code></pre>
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