Xaml 无法创建“X"的实例. [英] Xaml cannot create an instance of "X"

问题描述

我正在尝试在 Windows Phone 7 中为我的应用程序创建一个设置页面.我创建了 AppSettings 类并从我的 MainPage.xaml 引用它.这是我的代码:

I am trying to create a Settings page for my app in Windows Phone 7. I created the AppSettings class and is referring it from my MainPage.xaml. This is my code:

<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 的行(本地:AppSettings 行)上，我收到一条错误消息，指出无法创建 AppSettings 的实例".

But on the line where I refer the AppSettings (local:AppSettings line) , I get an error message stating that " cannot create an instance of AppSettings".

推荐答案

这是因为实例化 ApplicationsSettings 会引发异常.如果您将以下内容添加到您的构造函数中，您应该没问题；

This is because instantiating ApplicationsSettings throws an exception. If you add the following to your constructor, you should be fine;

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

这篇关于Xaml 无法创建“X"的实例.的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！