Question

我正在尝试使用独立存储进行简单测试，因此我可以将其用于我正在制作的Windows Phone 7应用程序。

我正在创建的测试设置a用一个按钮创建一个键和值，而另一个按钮设置该值等于TextBlock的文本。

namespace IsoStore
{
public partial class MainPage : PhoneApplicationPage
{
    // Constructor
    public MainPage()
    {
        InitializeComponent();
    }

    public class AppSettings
    {
        IsolatedStorageSettings appSettings = IsolatedStorageSettings.ApplicationSettings;

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            appSettings.Add("email", "someone@somewhere.com");
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            textBlock1.Text = (string)appSettings["email"];
        }
    }      
}
}

这种方式给了我这个错误：

无法通过嵌套类型'IsoStore.MainPage.AppSettings'访问外部类型'IsoStore.MainPage'的非静态成员

所以我尝试了这个：

namespace IsoStore
{
public partial class MainPage : PhoneApplicationPage
{
    // Constructor
    public MainPage()
    {
        InitializeComponent();
    }

    public class AppSettings
    {
        IsolatedStorageSettings appSettings = IsolatedStorageSettings.ApplicationSettings;

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            appSettings.Add("email", "someone@somewhere.com");
        }

    }

    private void button2_Click(object sender, RoutedEventArgs e)
    {
        textBlock1.Text = (string)appSettings["email"];
    }
}
}

相反，我得到了这个错误：

当前上下文中不存在名称'appSettings'

那么我在这里忽略了一个明显的问题？

非常感谢你的时间。

Answer 1

appSettings超出了button2_Click

的范围

更新由于IsolatedStorageSettings.ApplicationSettings无论如何都是静态的，根本不需要引用。只需直接访问它。

namespace IsoStore
{

 public partial class MainPage : PhoneApplicationPage
 {


    // Constructor
    public MainPage()
    {
    InitializeComponent();


    }


    private void button1_Click(object sender, RoutedEventArgs e)
    {
    IsolatedStorageSettings.ApplicationSettings.Add("email", "someone@somewhere.com");
    }



    private void button2_Click(object sender, RoutedEventArgs e)
    {
       textBlock1.Text = (string)IsolatedStorageSettings.ApplicationSettings["email"];
    }
  }
}

Answer 2

尝试此代码，因为不需要定义AppSettings类。

namespace IsoStore
{
    public partial class MainPage : PhoneApplicationPage
    {
        IsolatedStorageSettings appSettings;

        // Constructor
        public MainPage()
        {
            InitializeComponent();
            appSettings = IsolatedStorageSettings.ApplicationSettings;
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            appSettings.Add("email", "someone@somewhere.com");
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            textBlock1.Text = (string)appSettings["email"];
        }
    }
}

简单的孤立存储问题

2 个答案: