关闭应用程序后未保存复合设置值

Question

By the end of the Saving function, composite settings are saved and retrieved correctly. However after closing down the Visual Studio run time instance and running the project again, composite values are back to default. What could be wrong here?

Save

private void SaveSettings()
    {
        var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
        var compositeTest = (Windows.Storage.ApplicationDataCompositeValue)localSettings.Values["Test"];

        // Save test
        compositeTest["A"] = PropA;
        compositeTest["B"] = PropB;
        compositeTest["C"] = PropC;

        // Retrieve test
        var a = compositeTest["A"];
        var b = compositeTest["B"];
        var c = compositeTest["C"];
}

Build

private void BuildSettings()
    {
        var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
        var compositeTest = (Windows.Storage.ApplicationDataCompositeValue)localSettings.Values["Test"];

            if (compositeTest == null)
            {
                Windows.Storage.ApplicationDataCompositeValue composite = new Windows.Storage.ApplicationDataCompositeValue();

                composite["A"] = PropA= 1;
                composite["B"] = PropB= 1;
                composite["C"] = PropC= 1;

                localSettings.Values["Test"] = composite;
            }
            else
            {
                PropA= (int)compositeTest["A"];
                PropB= (int)compositeTest["B"];
                PropC= (int)compositeTest["C"];
            }
 }

Answer 1

You need to add the composite setting to the Values IPropertySet of the LocalSettings :

private void SaveSettings()
{
    var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
    var compositeTest = new Windows.Storage.ApplicationDataCompositeValue();

    compositeTest["A"] = "A";

    localSettings.Values["Test"] = compositeTest;

}

private void BuildSettings()
{
    var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
    var compositeTest = localSettings.Values["Test"] as Windows.Storage.ApplicationDataCompositeValue;

    var a = compositeTest["A"];
}

Edit: Try to reset the localSettings.Values["Test"] key in your SaveSettings() method:

private void SaveSettings()
{
    var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
    var compositeTest = (Windows.Storage.ApplicationDataCompositeValue)localSettings.Values["Test"];

    // Save test
    compositeTest["A"] = PropA;
    compositeTest["B"] = PropB;
    compositeTest["C"] = PropC;

    // Retrieve test
    var a = compositeTest["A"];
    var b = compositeTest["B"];
    var c = compositeTest["C"];

    localSettings.Values["Test"] = compositeTest;
}