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我有一个像这样的 XML 文件：

我想获取所有标签 a:entry

<?xml version="1.0" encoding="utf-8"?>\n<a:feed xmlns:a="http://www.w3.org/2005/Atom" xmlns:os="http://a9.com/-/spec/opensearch/1.1/" xmlns="http://schemas.zune.net/catalog/apps/2008/02">\n  <a:link rel="next" type="application/atom+xml" href="/v8/catalog/apps?q=facebook&amp;startIndex=50&amp;chunkSize=50&amp;pagingToken=50%7c50&amp;os=8.0.10512.0&amp;cc=US&amp;oc=&amp;lang=vi-VN&amp;hw=469838850&amp;dm=Virtual&amp;oemId=NOKIA&amp;moId=" />\n  <a:link rel="self" type="application/atom+xml" href="/v8/catalog/apps?q=facebook&amp;chunkSize=50&amp;os=8.0.10512.0&amp;cc=US&amp;oc=&amp;lang=vi-VN&amp;hw=469838850&amp;dm=Virtual&amp;oemId=NOKIA&amp;moId=" />\n  <os:startIndex>0</os:startIndex>\n  <os:totalResults>51</os:totalResults>\n  <os:itemsPerPage>50</os:itemsPerPage>\n  <a:updated>2013-11-01T08:30:11.711450Z</a:updated>\n  <a:title type="text">List Of Items</a:title>\n  <a:id>tag:catalog.zune.net,2013-11-01:/apps</a:id>\n  <pagingToken>50|50</pagingToken>\n  <impressionId>cd11c7b0116143dcb4c99f15b72ebbc4</impressionId>\n  <a:entry>\n    <a:updated>2013-11-01T08:30:11.711450Z</a:updated>\n    <a:title type="text">Facebook</a:title>\n    <a:id>urn:uuid:82a23635-5bd9-df11-a844-00237de2db9e</a:id>\n    <isHardwareCompatible>true</isHardwareCompatible>\n    <sortTitle>Facebook</sortTitle>\n    <releaseDate>2010-10-19T13:07:17.103000Z</releaseDate>\n    <version>5.1.2.0</version>\n    <averageUserRating>5.963479</averageUserRating>\n    <userRatingCount>42825</userRatingCount>\n    <image>\n      <id>urn:uuid:f8b42bcd-45c3-4ea5-9c9e-a108ac33cd6e</id>\n    </image>\n    <hasLiveTile>true</hasLiveTile>\n    <categories>\n      <category>\n        <id>windowsphone.Social</id>\n        <title>ma\xcc\xa3ng xa\xcc\x83 h\xc3\xb4\xcc\xa3i</title>\n        <isRoot>True</isRoot>\n      </category>\n    </categories>\n    <tags>\n      <tag>Independent</tag>\n      <tag>LockScreen_Background</tag>\n      <tag>LockScreen_Notification_IconCount</tag>\n      <tag>LockScreen_Notification_TextField</tag>\n      <tag>phone.protocol.fb</tag>\n    </tags>\n    <offers>\n      <offer>\n        <offerId>urn:uuid:5c6b4028-74c5-4648-a71e-2ca413a5d2fd</offerId>\n        <mediaInstanceId>urn:uuid:64051c69-fb7b-4972-ad42-1dbb2e626a2c</mediaInstanceId>\n        <clientTypes>\n          <clientType>WindowsPhone80</clientType>\n          <clientType>WindowsPhone81</clientType>\n        </clientTypes>\n        <paymentTypes>\n          <paymentType>Credit Card</paymentType>\n          <paymentType>Mobile Operator</paymentType>\n        </paymentTypes>\n        <store>ZEST</store>\n …

我在编辑后将字符串解析为XDocument时出现此错误并保存.但任何人都可以帮我找到错误位置 - 第1行,第10475位.我怎么能得到那个位置？

System.Xml.XmlException:意外的XML声明.XML声明必须是文档中的第一个节点,并且不允许在其前面显示空白字符.第1行,第10475位.

if (storage.FileExists("APPSDATA.xml"))
{
  var reader = new StreamReader(new IsolatedStorageFileStream("APPSDATA.xml", FileMode.Open, storage));

  string xml = reader.ReadToEnd();
  var xdoc = XDocument.Parse(xml);//error here 
  reader.Close(); 

XML很大,这是jus的一部分

<?xml version="1.0" encoding="UTF-8"?>
<Ungdungs>
  <Ungdung>
    <Name>HERE City Lens</Name>
    <Id>b0a0ac22-cf9e-45ba-8120-815450e2fd71</Id>
    <Path>/Icon/herecitylens.png</Path>
    <Version>1.0.0.0</Version>
    <Category>HERE</Category>
    <Date>Uknown</Date>
  </Ungdung>
  <Ungdung>
    <Name>HERE Transit</Name>
    <Id>adfdad16-b54a-4ec3-b11e-66bd691be4e6</Id>
    <Path>/Icon/heretransit.png</Path>
    <Version>1.0.0.0</Version>
    <Category>HERE</Category>
    <Date>Uknown</Date>
  </Ungdung>