Windows phone 8 使用NavigationService.GoBack（）在windows phone应用程序中存储和获取数据

我已经创建了一个基于问答游戏的Windows phone应用程序。我希望当用户给出某个问题的正确答案时，问题选项卡上会永久出现一个小记号。 我想存储每个问题的分数，以便在地名中显示为“您的分数”。即使应用程序关闭，该分数也不会重置。我使用IsolatedStorageFile分别存储每个页面的数据。在每个页面中，我都提供了一个后退按钮，该按钮将使用“NavigationService.GoBack（）”导航到类别页面

//分类页

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.IO;
using System.IO.IsolatedStorage;

namespace logic
{
    public partial class logo : PhoneApplicationPage
    {


        public logo()
        {
            InitializeComponent();
            int x = 0;





            //Obtain a virtual store for application
            IsolatedStorageFile fileStorage = IsolatedStorageFile.GetUserStoreForApplication();
            //Create a new StreamReader
            StreamReader fileReader = null;

            if (fileStorage.FileExists("amazon.txt"))
            {
                //Read the file from the specified location.
                fileReader = new StreamReader(new IsolatedStorageFileStream("amazon.txt", FileMode.Open, fileStorage));
                //Read the contents of the file (the only line we created).
                string textFile = fileReader.ReadLine();
                x = Convert.ToInt32(textFile);
                //Write the contents of the file to the TextBlock on the page.
                fileReader.Close();

                if (x == 1)
                {


                    ama.Visibility = System.Windows.Visibility.Visible;

                }
            }
}

private void Image_Tap(object sender, System.Windows.Input.GestureEventArgs e)
        {
            NavigationService.Navigate(new Uri("/amazon.xaml", UriKind.Relative));




        }
}}

//问题页

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Net;
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Navigation;
    using Microsoft.Phone.Controls;
    using Microsoft.Phone.Shell;
    using System.IO;
    using System.IO.IsolatedStorage;

    namespace logic
    {
        public partial class amazon : PhoneApplicationPage
        {
            public amazon()
            {
                InitializeComponent();

            }





          //check the answer is correct or not  

            int count = 0;
            int x;
            private void b1_Click(object sender, RoutedEventArgs e)
            {


                if (tb1.Text.Length == 0 || tb2.Text.Length == 0 || tb3.Text.Length == 0 || tb4.Text.Length == 0 || tb5.Text.Length == 0 || tb6.Text.Length == 0)
                {


                }


                else
                {

                    Char s1, s2, s3, s4, s5, s6;

                    s1 = Char.ToUpper(tb1.Text[0]);
                    s2 = Char.ToUpper(tb2.Text[0]);
                    s3 = Char.ToUpper(tb3.Text[0]);
                    s4 = Char.ToUpper(tb4.Text[0]);
                    s5 = Char.ToUpper(tb5.Text[0]);
                    s6 = Char.ToUpper(tb6.Text[0]);

                    if (s1 == 'A' && s2 == 'M' && s3 == 'A' && s4 == 'Z' && s5 == 'O' && s6 == 'N')
                    {


                        //Obtain a virtual store for application
                        IsolatedStorageFile fileStorage = IsolatedStorageFile.GetUserStoreForApplication();

 //Create a new StreamReader
                        StreamReader fileReader = null;

                        //Read the file from the specified location.
                        fileReader = new StreamReader(new IsolatedStorageFileStream("amazon.txt", FileMode.Open, fileStorage));

 //Read the contents of the file (the only line we created).
                        string textFile = fileReader.ReadLine();
                        x = Convert.ToInt32(textFile);

 //Write the contents of the file to the TextBlock on the page.
                        fileReader.Close();

                        if (x == 0)
                        {
                            fileStorage.DeleteFile("amazon.txt");

                            //Create a new StreamWriter, to write the file to the specified location.
                            StreamWriter fileWriter = new StreamWriter(new IsolatedStorageFileStream("amazon.txt", FileMode.OpenOrCreate, fileStorage));


                            fileWriter.WriteLine("1");
                            //Close the StreamWriter.
                            fileWriter.Close();

                        }


                            ans.Text = "Correct!!!";

                    }

                    else
                    {
                     ans.Text = "\n\nINCORRECT";

                    }
                }

            }



         //reset the value   

            private void reset_Click(object sender, RoutedEventArgs e)
            {

                tb1.Text = "";
                tb2.Text = ""; tb3.Text = ""; tb4.Text = ""; tb5.Text = ""; tb6.Text = "";


            }

            private void Image_Tap(object sender, System.Windows.Input.GestureEventArgs e)
            {
                  NavigationService.GoBack();


            }







        }
    }

问题是，当我给出正确答案并按下返回按钮导航到徽标页面时，技巧（在分类代码中称为“ama”）不会显示。但当我再次导航到主页，然后回到分类页面时，技巧就显示出来了。我希望，当我给出正确答案并使用应用程序中提供的后退按钮或移动设备的后退按钮导航回分类页面时，技巧只能在那时显示。

根据您的代码。 您的逻辑位于该

类的
构造函数中。当您从主页面导航到它时，它将被调用，而当您从问题页返回时，它将不再被调用。
因此，当代码返回时，您在逻辑上没有执行任何代码，因此显示了与以前相同的视图

要使其更新，请在
Page\u Loaded
事件中写入您的逻辑代码。
听起来您没有（重新）加载图像，也没有更新在返回时是否应该显示的图像。我想这实际上包括在你的另一个问题中：在你的构造函数中。。这个，上膛了+=
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Net;
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Navigation;
    using Microsoft.Phone.Controls;
    using Microsoft.Phone.Shell;
    using System.IO;
    using System.IO.IsolatedStorage;

    namespace logic
    {
        public partial class amazon : PhoneApplicationPage
        {
            public amazon()
            {
                InitializeComponent();

            }





          //check the answer is correct or not  

            int count = 0;
            int x;
            private void b1_Click(object sender, RoutedEventArgs e)
            {


                if (tb1.Text.Length == 0 || tb2.Text.Length == 0 || tb3.Text.Length == 0 || tb4.Text.Length == 0 || tb5.Text.Length == 0 || tb6.Text.Length == 0)
                {


                }


                else
                {

                    Char s1, s2, s3, s4, s5, s6;

                    s1 = Char.ToUpper(tb1.Text[0]);
                    s2 = Char.ToUpper(tb2.Text[0]);
                    s3 = Char.ToUpper(tb3.Text[0]);
                    s4 = Char.ToUpper(tb4.Text[0]);
                    s5 = Char.ToUpper(tb5.Text[0]);
                    s6 = Char.ToUpper(tb6.Text[0]);

                    if (s1 == 'A' && s2 == 'M' && s3 == 'A' && s4 == 'Z' && s5 == 'O' && s6 == 'N')
                    {


                        //Obtain a virtual store for application
                        IsolatedStorageFile fileStorage = IsolatedStorageFile.GetUserStoreForApplication();

 //Create a new StreamReader
                        StreamReader fileReader = null;

                        //Read the file from the specified location.
                        fileReader = new StreamReader(new IsolatedStorageFileStream("amazon.txt", FileMode.Open, fileStorage));

 //Read the contents of the file (the only line we created).
                        string textFile = fileReader.ReadLine();
                        x = Convert.ToInt32(textFile);

 //Write the contents of the file to the TextBlock on the page.
                        fileReader.Close();

                        if (x == 0)
                        {
                            fileStorage.DeleteFile("amazon.txt");

                            //Create a new StreamWriter, to write the file to the specified location.
                            StreamWriter fileWriter = new StreamWriter(new IsolatedStorageFileStream("amazon.txt", FileMode.OpenOrCreate, fileStorage));


                            fileWriter.WriteLine("1");
                            //Close the StreamWriter.
                            fileWriter.Close();

                        }


                            ans.Text = "Correct!!!";

                    }

                    else
                    {
                     ans.Text = "\n\nINCORRECT";

                    }
                }

            }



         //reset the value   

            private void reset_Click(object sender, RoutedEventArgs e)
            {

                tb1.Text = "";
                tb2.Text = ""; tb3.Text = ""; tb4.Text = ""; tb5.Text = ""; tb6.Text = "";


            }

            private void Image_Tap(object sender, System.Windows.Input.GestureEventArgs e)
            {
                  NavigationService.GoBack();


            }







        }
    }