將XML文件加載到UWP應用程序C＃

Question

我正在使用以下代碼將xml文件從安裝位置加載到本地文件夾中。

        // Has the file been copied already?
        bool blFileExist = false;
        try
        {
            await ApplicationData.Current.LocalFolder.GetFileAsync("settings.xml");
            // No exception means it exists
            blFileExist = true;
        }
        catch (System.IO.FileNotFoundException)
        {
            // The file obviously doesn't exist
            blFileExist = false;

        }
        catch (Exception)
        {

        }

        if (!blFileExist)
        {
            try
            {
                // Cant await inside catch
                StorageFile file = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync("settings.xml");
                await file.CopyAsync(ApplicationData.Current.LocalFolder);
            }
            catch (System.IO.FileNotFoundException)
            {

            }
            catch (Exception)
            {

            }
        }

然后在需要時使用此方法加載它。

    private async void loadSettings()
    {
        try
        {
            StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync("settings.xml");
            using (Stream fileStream = await file.OpenStreamForReadAsync())
            {
                doc = XElement.Load(fileStream);
            }

        }
        catch (System.IO.FileNotFoundException ex)
        {
        }
        catch (Exception ex)
        {
        }
    }

最后，我使用它將其保存回本地文件夾。

    private async void saveSettings()
    {
        try
        {
            StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync("settings.xml");
            using (Stream fileStream = await file.OpenStreamForWriteAsync())
            {
                //Save URLs
                doc.Save(fileStream);
            }
        }
        catch (System.IO.FileNotFoundException ex)
        {
        }
        catch (Exception ex)
        {
        }
    }

代碼編譯，運行並且不會引發任何錯誤，但是沒有按預期執行。 當使用第二個代碼塊中的代碼加載文件時，它會跳出代碼並返回調用該文件的方法，就好像拋出錯誤並在到達該行時進入catch塊

using (Stream fileStream = await file.OpenStreamForReadAsync())

不太確定，但我認為這可能取決於編碼和字節順序標記。 有什么建議么？

這是有問題的xml。

<?xml version="1.0" encoding="utf-8" ?>
  <settings>
    <feeds>
      <url name="All">http://services.parliament.uk/calendar/all.rss</url>
      <url name="CommonsMainChamber">http://services.parliament.uk/calendar/commons_main_chamber.rss</url>
      <url name="CommonsSelectCommittee">http://services.parliament.uk/calendar/commons_select_committee.rss</url>
      <url name="CommonsGeneralCommittee">http://services.parliament.uk/calendar/commons_general_committee.rss</url>
      <url name="CommonsWestminsterHall">http://services.parliament.uk/calendar/commons_westminster_hall.rss</url>
      <url name="LordsMainChamber">http://services.parliament.uk/calendar/lords_main_chamber.rss</url>
      <url name="LordsGrandCommittee">http://services.parliament.uk/calendar/lords_grand_committee.rss</url>
      <url name="LordsSelectCommittee">http://services.parliament.uk/calendar/lords_select_committee.rss</url>
      <url name="ParliamentaryNews">http://www.parliament.uk/g/RSS/news-feed/?pageInstanceId=209</url>
      <url name="CommonsNews">http://www.parliament.uk/g/RSS/news-feed/?pageInstanceId=25366</url>
      <url name="LordsNews">http://www.parliament.uk/g/RSS/news-feed/?pageInstanceId=25367</url>
      <url name="CommitteeNews">http://www.parliament.uk/g/RSS/news-feed/?pageInstanceId=25388</url>
      <url name="CommonsBriefingPapers">http://researchbriefings.parliament.uk/rssfeed/Commons%20Briefing%20papers</url>
      <url name="LordsLibraryNotes">http://researchbriefings.parliament.uk/rssfeed/Lords%20Library%20notes</url>
      <url name="LordsInFocus">http://researchbriefings.parliament.uk/rssfeed/Lords%20In%20Focus</url>
      <url name="POSTBriefs">http://researchbriefings.parliament.uk/rssfeed/POSTbriefs</url>
      <url name="POSTNotes">http://researchbriefings.parliament.uk/rssfeed/POSTnotes</url>
      <url name="EarlyDayMotions">http://www.parliament.uk/g/rss/generic/?pageInstanceId=78055&type=Edms</url>
    </feeds>
 </settings>

Answer 1

恐怕您的問題出在您的XML文件中。 請檢查最后一個網址的值。 XML文件實際上包含一個“＆”字符。

<url name="EarlyDayMotions">http://www.parliament.uk/g/rss/generic/?pageInstanceId=78055&type=Edms</url>

真正的“＆”本身會中斷XML文件。

您可以使用& 代替& ，那么您的代碼將起作用。