System.Collections.Generic.KeyNotFoundException For Seemingly No Reason

Question

Here is my code for some settings

if (settings.Contains("dynamicOn"))
        {
            // Commenting out because we're trying a different way
            // DynamicCheck.IsChecked = (bool)settings["dynamicOn"];
            dynamicToggle.IsChecked = (bool)settings["dynamicOn"];
            AllPacks.IsChecked = (bool)settings["changeAllPacks"];
        }

And here is the XAML behind it

 <toolkit:ToggleSwitch x:Name="dynamicToggle" Header="Dynamically Update Lockscreen?" Margin="0,112,0,-112" SwitchForeground="White" Checked="DynamicCheck_Checked_1" Unchecked="DynamicCheck_Unchecked">
                        <toolkit:ToggleSwitch.HeaderTemplate>
                            <DataTemplate>
                                <ContentControl Content="{Binding}"/>
                            </DataTemplate>
                        </toolkit:ToggleSwitch.HeaderTemplate>
                    </toolkit:ToggleSwitch>
                    <CheckBox x:Name="AllPacks" Content="All Packs" Checked="AllPacks_Checked" Unchecked="AllPacks_Unchecked" Margin="50,174,0,0" Visibility="Collapsed"/>

Now, the XAML works fine, as well as the ToggleSwitch. All that works. Just, when I try to actually open up my settings page (which opens just fine without the CheckBox stuff, but refuses to open with it), I get this error

A first chance exception of type 'System.Collections.Generic.KeyNotFoundException' occurred in mscorlib.ni.dll The program '[3048] TaskHost.exe' has exited with code -1 (0xffffffff).

Has anyone seen this before? Searching Bing doesn't seem to have anything for me. Any help would be greatly appreciated!

Thanks, Patrick

EDIT: I've changed the code to this

if (settings.Contains("dynamicOn"))
        {
            // Commenting out because we're trying a different way
            // DynamicCheck.IsChecked = (bool)settings["dynamicOn"];
            AllPacks.IsChecked = (bool)settings["changeAllPacks"];
            dynamicToggle.IsChecked = (bool)settings["dynamicOn"];
        }
        else
        {
            // Commenting out because we're trying a different way
            // DynamicCheck.IsChecked = true;
            // isEnabledText.Visibility = Visibility.Visible;
            // settings.Add("dynamicOn", true);
            dynamicToggle.IsChecked = true;
            AllPacks.IsChecked = true;
            AllPacks.Visibility = Visibility.Visible;
            settings.Add("changeAllPacks", true);
            settings.Add("dynamicOn", true);
        }

And now it errors on the

settings.Add("dynamicOn", true);

And the error has also changed to

A first chance exception of type 'System.ArgumentException' occurred in mscorlib.ni.dll

So, I'm starting to think that this might be an IsolatedStorage issue?

Rather than guessing, get the stack trace of the exception and see exactly which line of code is causing the problem. — RobSiklos, Aug 27 '13 at 14:07

score 1 · Answer 1 · answered Aug 26 '13 at 19:25

1

You're checking that settings contains dynamicOn, but what about changeAllPacks. Probably that setting is not defined and that's why you're getting the error.

answered Aug 26 '13 at 19:25

RobSiklos

8,348
5
47
77

score 0 · Answer 2 · answered Aug 27 '13 at 01:53

How is 'settings' defined? If you are trying to store application settings, try using IsolatedStoragSettings.ApplicationSettings instead. I use that, and actually have helper methods in a SettingsManager class for getting and setting any values. (The Mutex code is in there, since my settings are accessed by both the foreground and a background task, and that keeps any conflicts from occurring.)

The default value also makes your code simpler, since you don't have to check if the value exists first.

public static T GetSetting<T>(string settingKey, T defaultValue)
{
    Mutex mutex = new Mutex(false, "MyAppSettingsLock");
    mutex.WaitOne();

    T result;
    if (IsolatedStorageSettings.ApplicationSettings.Contains(settingKey))
        result = (T)IsolatedStorageSettings.ApplicationSettings[settingKey];
    else
        result = defaultValue;

    mutex.ReleaseMutex();

    return result;
}

public static void SetSetting<T>(string settingKey, T value)
{
    Mutex mutex = new Mutex(false, "MyAppSettingsLock");
    mutex.WaitOne();

    IsolatedStorageSettings.ApplicationSettings[settingKey] = value;
    IsolatedStorageSettings.ApplicationSettings.Save();

    mutex.ReleaseMutex();
}

Isolated storage access can be flaky - you would do well to put that code in a `try` block, and put the `mutex.ReleaseMutex();` in a `finally` — RobSiklos, Aug 27 '13 at 14:06

score 0 · Answer 3 · answered Aug 27 '13 at 16:24

0

Not sure exactly what happened.. But somehow the issue seemed to resolve itself.. Thanks for all the help anyway though!

answered Aug 27 '13 at 16:24

PatrickC

33
1
5

System.Collections.Generic.KeyNotFoundException For Seemingly No Reason

3 Answers3