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();
}
}
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