C# XMLreader và các nút con

Question

Tôi có tệp xml này.

  <movies> 
      <movie> 
       <score>8.582207</score> 
       <popularity>3</popularity> 
       <translated>true</translated> 
       <adult>false</adult> 
       <language>en</language> 
       <original_name>Transformers</original_name> 
       <name>Transformers</name> 
       <alternative_name>The Transformers</alternative_name> 
       <type>movie</type> 
       <id>1858</id> 
       <imdb_id>tt0418279</imdb_id> 
       <url>http://www.themoviedb.org/movie/1858<;/url> 
       <votes>28</votes> 
       <rating>7.2</rating> 
       <certification>PG-13</certification> 
       <overview>The Earth is caught in the middle of an intergalactic war /overview> 
       <released>2007-07-04</released> 
       <images> 
        <image type="poster" url="http://hwcdn.themoviedb.org/posters/304/4bc91347017a3c57fe007304/transformers-original.jpg" size="original" id="4bc91347017a3c57fe007304"/> 
        <image type="poster" url="http://hwcdn.themoviedb.org/posters/304/4bc91347017a3c57fe007304/transformers-mid.jpg" size="mid" id="4bc91347017a3c57fe007304"/> 
        <image type="poster" url="http://hwcdn.themoviedb.org/posters/304/4bc91347017a3c57fe007304/transformers-cover.jpg" size="cover" id="4bc91347017a3c57fe007304"/> 
        <image type="poster" url="http://hwcdn.themoviedb.org/posters/304/4bc91347017a3c57fe007304/transformers-thumb.jpg" size="thumb" id="4bc91347017a3c57fe007304"/> 
        <image type="backdrop" url="http://hwcdn.themoviedb.org/backdrops/2ce/4bc91339017a3c57fe0072ce/transformers-original.jpg" size="original" id="4bc9133s9017a3c57fe0072ce"/> 
        <image type="backdrop" url="http://hwcdn.themoviedb.org/backdrops/2ce/4bc91339017a3c57fe0072ce/transformers-poster.jpg" size="poster" id="4bc91339017a3c57fe0072ce"/> 
        <image type="backdrop" url="http://hwcdn.themoviedb.org/backdrops/2ce/4bc91339017a3c57fe0072ce/transformers-thumb.jpg" size="thumb" id="4bc91339017a3c57fe0072ce"/> 
       </images> 
      <last_modified_at>2010-04-26 03:26:14</last_modified_at> 
     </movie> 
    </movies> 

Tôi đọc tất cả các thuộc tính bằng cách sử dụng

textReader.ReadToFollowing("original_name"); 
string title =textReader.ReadElementContentAsString("original_name",textReader.NamespaceURI); 

Tuy nhiên, bất cứ điều gì tôi cố gắng tôi không thể quản lý để đọc các nút con của "hình ảnh".

Answer 1

Bạn nên đọc tới phần tử <images>, sau đó đọc cho <image> hậu duệ đầu tiên, và sau đó đọc cho các anh chị em tiếp theo cho đến khi bạn không thể nữa. Mã dưới đây cho thấy cách này có thể được thực hiện.

public class StackOverflow_6473251 
{ 
    public static void Test() 
    { 
     string xml = @"    <movies> 
      <movie> 
       <score>8.582207</score> 
       <popularity>3</popularity> 
       <translated>true</translated> 
       <adult>false</adult> 
       <language>en</language> 
       <original_name>Transformers</original_name> 
       <name>Transformers</name> 
       <alternative_name>The Transformers</alternative_name> 
       <type>movie</type> 
       <id>1858</id> 
       <imdb_id>tt0418279</imdb_id> 
       <url>http://www.themoviedb.org/movie/1858</url> 
       <votes>28</votes> 
       <rating>7.2</rating> 
       <certification>PG-13</certification> 
       <overview>The Earth is caught in the middle of an intergalactic war /overview> 
       <released>2007-07-04</released> 
       <images> 
        <image type=""poster"" url=""http://hwcdn.themoviedb.org/posters/304/4bc91347017a3c57fe007304/transformers-original.jpg"" size=""original"" id=""4bc91347017a3c57fe007304""/> 
        <image type=""poster"" url=""http://hwcdn.themoviedb.org/posters/304/4bc91347017a3c57fe007304/transformers-mid.jpg"" size=""mid"" id=""4bc91347017a3c57fe007304""/> 
        <image type=""poster"" url=""http://hwcdn.themoviedb.org/posters/304/4bc91347017a3c57fe007304/transformers-cover.jpg"" size=""cover"" id=""4bc91347017a3c57fe007304""/> 
        <image type=""poster"" url=""http://hwcdn.themoviedb.org/posters/304/4bc91347017a3c57fe007304/transformers-thumb.jpg"" size=""thumb"" id=""4bc91347017a3c57fe007304""/> 
        <image type=""backdrop"" url=""http://hwcdn.themoviedb.org/backdrops/2ce/4bc91339017a3c57fe0072ce/transformers-original.jpg"" size=""original"" id=""4bc9133s9017a3c57fe0072ce""/> 
        <image type=""backdrop"" url=""http://hwcdn.themoviedb.org/backdrops/2ce/4bc91339017a3c57fe0072ce/transformers-poster.jpg"" size=""poster"" id=""4bc91339017a3c57fe0072ce""/> 
        <image type=""backdrop"" url=""http://hwcdn.themoviedb.org/backdrops/2ce/4bc91339017a3c57fe0072ce/transformers-thumb.jpg"" size=""thumb"" id=""4bc91339017a3c57fe0072ce""/> 
       </images> 
      <last_modified_at>2010-04-26 03:26:14</last_modified_at> 
     </movie> 
    </movies>"; 
     XmlReader r = XmlReader.Create(new StringReader(xml)); 
     r.ReadToFollowing("original_name"); 
     string title = r.ReadElementContentAsString("original_name", r.NamespaceURI); 
     r.ReadToFollowing("images"); 
     int imageCount = 0; 
     if (r.ReadToDescendant("image")) 
     { 
      do 
      { 
       Console.WriteLine("Image {0}", ++imageCount); 
       Console.WriteLine(" Type: {0}", r.GetAttribute("type")); 
       Console.WriteLine(" URL: {0}", r.GetAttribute("url")); 
       Console.WriteLine(" Size: {0}", r.GetAttribute("size")); 
       Console.WriteLine(" ID: {0}", r.GetAttribute("id")); 
      } while (r.ReadToNextSibling("image")); 
     } 
    } 
} 

Answer 2

Hãy thử cách sử dụng các đối tượng:

XmlDocument xml = new XmlDocument(); 
XmlNodeList nodes = xml.ChildNodes; 
XmlNode node = nodes[0]; 
XmlNode childNode = node.ChildNodes[0];