隨機XML例外 - ''，十六進制值0x1F，是無效字符

Question

我在嘗試加載到XDocument時抱怨隨機錯誤，抱怨我的XML中的無效字符。

' ', hexadecimal value 0x1F, is an invalid character. Line 1, position 1. 

這發生在這21個位置中的一個位置上，但有時不會發生。這是BBC的RSS，因此它是嚴格管理和編碼的XML。當我打開，我已經下載並有一個問題的文件，他們有時看起來像這裏面：

I-ÛnÛ8†ïôhQ[¤¤ÈvÙÁÆEZ「¢hÒä2 %Ú""‰IÅÍ[õúd;」åSì´nÐ,öƦ43üçð‘P|ò­Èáž+-d9t<—:ÀËD¦¢œ ¯WgÝs2zý*VZº–:bFC'3¦Š™Ïçî<p¥šŸÒüF§uœq‰Q[®‹Wûb鬵}ÔF%€8ÉXYò¼yÀG+墼ƒLñéj?YñÒÍÅ=w'「ÄM¤[ß‘9g&ãŠL9O5á%ñ{Gƒ°L‚」=L¥â ÓÆmtχŽæùÔóPñ¡Ãª* 3˜AwX„d™„&ç£ÓÓ1Ü,4 g톀;|È™žÉy¾–ÂðþÁ¦²ˆÉ"´ÝÇÖ1ÚèÈnîmÊ1i\Û°」ëD‰Ê&7 ºXL7Å[m˜*YÀF’e’×vš0_¾2¼¨¸b¦VX™Â\à(qŸ¢©>&›j˼Y9«ÙŒ8ÚW­1‘Õƒ³ÌŒÆËUoÆoáT #t†ÿ’¥6[›ÈXªJªFªšsØÛÃU¡ KSaY~kÁÑ™A\mÅ–)7Lä:&ëÚŒªzòž>ºÊêÐc¸ÀŽùÔÀëGÞ ÂÅ;êQ「¥c'ŠuYnê¸S­òåصÁÚ[ªx4zê®OÒd¡‰Hd‰¿e*îEZcÂþíâ/oey›ÛŠo'3âùîLLcbEVŠÏ# ç"5Ù¨ëÅd±Z2Þ´ØZÚeÛ5²Ù¶ûP<n!ÎAiÄ6‚s_˜Àá_ˆRuWk"#èÿø>†7GáïgowÚxpQ'(6¤KÛû—⸱'ã½ÀyÛˆ>Ie2DA#œùCk¿¬ð²ÁÈ¢Ê:p-´˜ˆ\¬ôš«ø eÚÏŠkÝ÷ŠI>Ö…H¯>ýṆ/BßE࣯Ìóz¡wnÁº¬KÍñ<ù^äypzyµï|>yŒœÕ/ ýO;Ç~ )Ë5wjt—v­J—†]z|åõ"J#¿çŽ(ÊEVÏn¿!ÖÜûQ%EiFaèz¡B÷ÈõÃ~/ˆÉ–}Åש½x)ÑÀu「¡Æ¹¬±éìÛ ™pØLøÅô~ à/ó;à„ìBjñ„KY?Iªç†*Ââm³Úëm²ìeU ±4Œpªë6¿Áÿ_o‹ßVË¥ô¿ä÷ÒNv÷zÜ] BŸ8\ðáý€ýßx3¿' ÞLp?À{¨ ¦ÖtÃ~‡Ú-ÚðYÔE¼μþμÖKQ

這是否損壞？當我更新這些天氣位置時，我有問題嗎？這裏是我的代碼...

Module_XML_Download：

Public Sub DownloadXML(ByVal URL As String, ByVal SaveAs As String) 
    Try 
     Dim WebClient As New System.Net.WebClient() 

     WebClient.DownloadFile(URL, SaveAs) 
     If My.Settings.LogXMLDownloaded = True Then 
      Module_Log.WriteLog(Now.ToString & " XML Downloaded: " & SaveAs) 
     End If 

    Catch _Exception As Exception 

     ' Error 
     ' MsgBox("Exception caught in process: {0}", _Exception.ToString()) 
     If My.Settings.LogXMLDownloadError = True Then 
      Module_Log.WriteLog(Now.ToString & " XML DL Error: " & _Exception.Message) 
     End If 
    End Try 

End Sub 

和：

Public Sub DownloadWeather() 

    If IsConnectionAvailable() = True Then 

     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2657832/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Aberdeen.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2656752/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Aviemore.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2653609/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Barra.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2650752/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Dundee.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2650798/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Dumfries.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2651245/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Dingwall.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2650225/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Edinburgh.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2648579/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Glasgow.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2636239/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Harris.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2646088/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Inverness.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2655051/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Islay.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2636790/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Lewis.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2635754/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Mull.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2641108/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Oban.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2645198/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Orkney.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2640358/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Perth.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2644605/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Shetland.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2640006/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Skye.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2635881/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Thurso.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2643811/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Uist.xml") 
     Module_XML_Download.DownloadXML("http://open.live.bbc.co.uk/weather/feeds/en/2635199/3dayforecast.rss", My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Ullapool.xml") 

    End If 

End Sub 

然後我裝替補的一個示例：

Public Sub WeatherAviemore_Load() 
    'weatherDoc = XDocument.Load("http://open.live.bbc.co.uk/weather/feeds/en/2656752/3dayforecast.rss") 
    weatherDoc = XDocument.Load(My.Settings.DataMainFolder & "\" & My.Settings.DataWeatherXMLFolder & "\Aviemore.xml") 
    PopulateWeatherListBox(weatherDoc, MainForm.WeatherAviemoreListBox, "Aviemore", "An Aghaidh Mhòr") 
End Sub 

Answer 1

你的樣品給出的不是xml文件和消息，說你的文件從一開始就不好（Line 1, position 1）。 XML文檔應該像這樣（wikipedia）：

<?xml version="1.0" encoding="UTF-8" ?> 
<俄語>данные</俄語> 

編輯 據我瞭解，現在一個文件有時正確下載，有時沒有。所以最好的解決方案是接受這個事實並嘗試再次下載。例如

Dim Success As Boolean = False 
    Do 
     Try 
      weatherDoc = XDocument.Load("http://open.live.bbc.co.uk/weather/feeds/en/2656752/3dayforecast.rss") 
      Success = True 
     Catch ex As XmlException 
      Success = False 
     End Try 
    Loop Until Success 

也許問另一個問題的東西「爲什麼我有時open.live.bbc.co.uk/weather下載垃圾？」