Windows Phone C＃-從文本文件加載

Question

我讓程序使用IsolatedStorageFile將4個不同文本框的內容保存到4個單獨的文本文件中。 正常工作，直到以后必須加載它們為止。 加載時，所有4個文本文件都加載到第一個文本框中，其余3個文本留空。

這是我用來保存文件的代碼：

private void Button_Click_2(object sender, RoutedEventArgs e)
    {
        defaultPicker.ItemsSource = new List<string>() { { box1.Text },   { box2.Text }, { box3.Text }, { box4.Text } };

        //Deletes any previous saved files

        IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication();
        storage.DeleteFile("ip-1.txt");
        storage.DeleteFile("ip-2.txt");
        storage.DeleteFile("ip-3.txt");
        storage.DeleteFile("ip-4.txt");

        // This saves users IP's into text files for later loading


        IsolatedStorageFile fileStorage = IsolatedStorageFile.GetUserStoreForApplication();
        StreamWriter Writer = new StreamWriter(new IsolatedStorageFileStream("ip-1.txt", FileMode.OpenOrCreate, fileStorage));
        Writer.WriteLine(box1.Text);

        new StreamWriter(new IsolatedStorageFileStream("ip-2.txt", FileMode.OpenOrCreate, fileStorage));
        Writer.WriteLine(box2.Text);

        new StreamWriter(new IsolatedStorageFileStream("ip-3.txt", FileMode.OpenOrCreate, fileStorage));
        Writer.WriteLine(box3.Text);

        new StreamWriter(new IsolatedStorageFileStream("ip-4.txt", FileMode.OpenOrCreate, fileStorage));
       Writer.WriteLine(box4.Text);

        Writer.Close();



    }

並在以后加載文件：

    private void Button_Click_4(object sender, RoutedEventArgs e)
    {

        // Loads IP's from text file or displays error message

        //First clear the boxes...

        box1.Text = "";
        box2.Text = "";
        box3.Text = "";
        box4.Text = "";

        //Load from text files...

        IsolatedStorageFile fileStorage = IsolatedStorageFile.GetUserStoreForApplication();
        StreamReader Reader = null;
        try
        {
            Reader = new StreamReader(new IsolatedStorageFileStream("ip-1.txt", FileMode.Open, fileStorage));
            string textFile = Reader.ReadToEnd();
            box1.Text = textFile;

        }
        catch
        {
        }



        IsolatedStorageFile.GetUserStoreForApplication();           
        try
        {
            Reader = new StreamReader(new IsolatedStorageFileStream("ip-2.txt", FileMode.Open, fileStorage));
            string textFile2 = Reader.ReadToEnd();
            box2.Text = textFile2;

        }
        catch
        {
        }



        IsolatedStorageFile.GetUserStoreForApplication();
        try
        {
            Reader = new StreamReader(new IsolatedStorageFileStream("ip-3.txt", FileMode.Open, fileStorage));
            string textFile3 = Reader.ReadToEnd();
            box3.Text = textFile3;

        }
        catch
        {
        }



        IsolatedStorageFile.GetUserStoreForApplication();
        try
        {
            Reader = new StreamReader(new IsolatedStorageFileStream("ip-4.txt", FileMode.Open, fileStorage));
            string textFile4 = Reader.ReadToEnd();
            box4.Text = textFile4;
            Reader.Close();

        }
        catch
        {
        }

        // To sync with ListPicker
        defaultPicker.ItemsSource = new List<string>() { { box1.Text },   { box2.Text }, { box3.Text }, { box4.Text } };
    }

任何對正確方向的幫助將不勝感激。

Answer 1

首先，我建議您停止食用所有異常食物。 至少在調試模式下，將空的catch塊放在一個編譯指示中。

我將刪除Reader的單個聲明，並為每個文件創建一個新的聲明：

try
{
    using (StreamReader reader = new StreamReader(new IsolatedStorageFileStream("ip-1.txt", FileMode.Open, fileStorage))) 
    {
        string textFile = reader.ReadToEnd();
        box1.Text = textFile;
    }
}

Answer 2

您沒有正確寫入這四個文件。 您每次都需要重新分配您的Writer 。

    StreamWriter Writer = new StreamWriter(new IsolatedStorageFileStream("ip-1.txt", FileMode.OpenOrCreate, fileStorage));
    Writer.WriteLine(box1.Text);

    Writer = new StreamWriter(new IsolatedStorageFileStream("ip-2.txt", FileMode.OpenOrCreate, fileStorage));
    Writer.WriteLine(box2.Text);

    Writer = new StreamWriter(new IsolatedStorageFileStream("ip-3.txt", FileMode.OpenOrCreate, fileStorage));
    Writer.WriteLine(box3.Text);

    Writer = new StreamWriter(new IsolatedStorageFileStream("ip-4.txt", FileMode.OpenOrCreate, fileStorage));
   Writer.WriteLine(box4.Text);

    Writer.Close();

將來，您應該在catch塊中添加一些內容以顯示任何捕獲的異常。 在這種情況下，它會告訴您其他三個文件由於不存在而無法加載。