Question

以下是我的一些设置代码

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"];
        }

这是背后的XAML

 <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"/>

现在，XAML和ToggleSwitch一样正常。一切正常。只是，当我尝试实际打开我的设置页面时（在没有CheckBox的情况下打开就好了，但拒绝用它打开），我收到此错误

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).

有没有人见过这个？搜索Bing似乎对我没有任何帮助。任何帮助将不胜感激！

谢谢，帕特里克

编辑：我已将代码更改为此

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);
        }

现在它在

上出错了

settings.Add("dynamicOn", true);

错误也改为

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

那么，我开始认为这可能是一个IsolatedStorage问题？

Answer 1

您正在检查settings是否包含dynamicOn，但changeAllPacks呢？可能没有定义设置，这就是你收到错误的原因。

Answer 2

如何定义'设置'？如果您尝试存储应用程序设置，请尝试使用IsolatedStoragSettings.ApplicationSettings。我使用它，实际上在SettingsManager类中有辅助方法来获取和设置任何值。（Mutex代码在那里，因为我的设置被前台和后台任务访问，并且可以防止发生任何冲突。）

默认值也使您的代码更简单，因为您不必先检查该值是否存在。

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();
}

Answer 3

不确定究竟发生了什么......但不知怎的，这个问题似乎已经解决了...... 不过，谢谢你的帮助！

System.Collections.Generic.KeyNotFoundException看似没有理由

3 个答案: