1.保存到Applicaion Data配置信息中：

保存：

private void testTB_TextChanged(object sender, TextChangedEventArgs e)
{
    ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
    localSettings.Values["value"] = testTB.Text;
}

读取：

private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
    ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
    if (localSettings.Values.ContainsKey("value"))
    {
        testTB.Text = localSettings.Values["value"].ToString();
    }
}

 

2.放到页面状态中保存

保存：

private void NavigationHelper_SaveState(object sender, SaveStateEventArgs e)
{
    e.PageState["value"] = testTB.Text;
}

读取：

private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
    if (e.PageState != null && e.PageState.ContainsKey("value"))
    {
        testTB.Text = e.PageState["value"].ToString();
    }
}