Xaml无法创建"X"的实例

Question

我正在尝试在Windows Phone 7中为我的应用程序创建"设置"页面.我创建了AppSettings类,并从我的MainPage.xaml中引用它.这是我的代码:

<phone:PhoneApplicationPage 
    x:Class="Shapes4Kids.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:ShapesSettings;assembly=Shapes4Kids" 
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="696"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">
    <phone:PhoneApplicationPage.Resources>
        <local:AppSettings x:Key="appSettings"></local:AppSettings>
    </phone:PhoneApplicationPage.Resources>

但是在我引用AppSettings(本地:AppSettings行)的行上,我收到一条错误消息,指出"无法创建AppSettings的实例".

Answer 1

这是因为实例化ApplicationsSettings 会引发异常。如果将以下内容添加到构造函数中，应该没问题；

try
{
    settings = IsolatedStorageSettings.ApplicationSettings;
}
catch (System.IO.IsolatedStorage.IsolatedStorageException e)
{
    // handle exception
}