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Sample code sharing for XmlDocument XML encoding conversion

黄舟
黄舟Original
2017-03-24 17:12:421946browse

Recently I made an RSS online aggregator. Most RSS 2.0 encoded XML encoded .NET compilers can read it correctly, but some, such as GBK encoding, our. NET cannot read it. If you manually change the XML encoding to "gb2312" or other encoding, it cannot be read. However, whether the encoding changes or not, IE can view it correctly. What to do next is really hard for me. How about changing the encoding? The RSS 2.0 files that my RSS online aggregator wants to read are not downloaded to local files, but read online. Well, after getting the connection, you can use the stream to get the correctly encoded XML stream. See the code below:

1 private void Page_Load(object sender, System.EventArgs e)
2 {
3 rssRepeater.DataSource = ReturnReadResult( Request[ "url" ] );
4 rssRepeater.DataBind( );
5 }
6
7 private DataTable ReturnReadResult( string rssUrl )
8    {
9      //构在DataTable表格
10      DataTable dt = CreateDataTable();
11       DataRow dr;
12
13      try 
14      {
15        XmlDocument xml = new XmlDocument();
16
17        //正常加载完全合格的RSS 2.0文件
18         try
19        {
20           xml.LoadXml( rssUrl );
21        }
22         catch
23        {
24          //下面的措施 针对一些特别的RSS 2.0文件,比如下面的一个站点:
25           //site :http://www.csdn.net/rss/rssfeed.aspx? rssid=1&bigclassid=14
26          //按照常规是无法正 常加载的。需要进一步处理。比如一些.NET暂时不支持的编码,目前可以读取所 知的RSS 2.0
27           rssUrl = "http://soft.yesky.com/index.xml";
28           System.Net.WebRequest wr = System.Net.WebRequest.Create( rssUrl );
29          System.Net.WebResponse srp = wr.GetResponse ();
30          //加入了把原先编码都转化成了2312gb形式。 
31          StreamReader sr = new StreamReader( srp.GetResponseStream() ,System.Text.Encoding.GetEncoding( "gb2312" ));
32
33          xml.LoadXml( sr.ReadToEnd( ).Trim( ) );
34          sr.Close();
35          srp.Close();
36        }
37
38        //读取总标题信息,可以判断是否有图片展示
39        try
40        {
41           titleLabel.Text = xml.SelectSingleNode ("/rss/channel/title").InnerText
42             + "<br><a href = "
43             + xml.SelectSingleNode("//image/link").InnerText
44             + ">"
45             + "<img src="
46            + xml.SelectSingleNode("//image/url").InnerText
47             + " border = no></a><br>"
48            + xml.SelectSingleNode ("/rss/channel/description").InnerText
49             + "<br>"
50            +  xml.SelectSingleNode("/rss/channel/link").InnerText;
51         }
52        catch
53         {
54          try
55          {
56             titleLabel.Text = xml.SelectSingleNode ("/rss/channel/title").InnerText
57               + "<br>"
58              + xml.SelectSingleNode("/rss/channel/description").InnerText
59              + "<br>"
60               + xml.SelectSingleNode ("/rss/channel/link").InnerText;
61           }
62          catch
63          {
64            //假如没有频道进行说明的情况下
65             titleLabel.Text = xml.SelectSingleNode ("/rss/channel/title").InnerText
66               + "<br>"
67              + xml.SelectSingleNode("/rss/channel/link").InnerText;
68           }
69        }
70
71         XmlNodeList nodes = xml.SelectNodes("//item");
72
73        foreach( XmlNode item in nodes )
74         {
75          dr = dt.NewRow();
76           foreach( XmlNode child in item.ChildNodes )
77           {
78
79            switch( child.Name )
80            {
81               case "title":
82                 dr[ "title" ] = child.InnerText;
83                 break;
84              case "link":
85                dr[ "link" ] = child.InnerText;
86                 break;
87              case "author":
88                dr[ "author" ] = child.InnerText;
89                 break;
90              case "guid":
91                dr[ "guid" ] = child.InnerText;
92                 break;
93              case "category":
94                dr[ "category" ] = child.InnerText;
95                 break;
96              case "pubDate":
97                dr[ "pubDate" ] = child.InnerText;
98                 break;
99              case "description":
100                dr[ "description" ] = child.InnerText;
101                 break;
102              case "comments":
103                dr[ "comments" ] = child.InnerText;
104                 break;
105            }
106           }
107          dt.Rows.Add( dr );
108         }
109        return dt;
110      } 
111      catch ( Exception ex )
112      {
113        Response.Write( ex.ToString( ) );
114         return null;
115      }
116    }
117
118//手动创立一个DataTable
119    private DataTable CreateDataTable()
120    {
121      DataTable dt = new DataTable();
122      DataColumn dc;
123
124       System.Type type;
125      type = System.Type.GetType("System.String");
126
127       dc = new DataColumn( "title",type );
128       dt.Columns.Add( dc );
129
130      dc = new DataColumn( "link", type );
131       dt.Columns.Add( dc );
132
133      dc = new DataColumn( "author", type );
134      dt.Columns.Add( dc );
135
136      dc = new DataColumn( "guid", type );
137      dc.DefaultValue = "";
138       dt.Columns.Add( dc );
139
140      dc = new DataColumn( "category", type );
141       dc.AllowDBNull = true;
142      dt.Columns.Add( dc );
143
144      dc = new DataColumn( "pubDate", type );
145      dt.Columns.Add( dc );
146
147       dc = new DataColumn( "description", type );
148       dc.AllowDBNull = true;
149      dt.Columns.Add( dc );
150
151      dc = new DataColumn( "comments", type );
152      dc.AllowDBNull = true;
153      dt.Columns.Add( dc );
154
155       return dt;
156    }

After processing in this way, most RSS 2.0 connections can be read.

As for processing local files, use StreamReader stream conversion encoding, the same process.

The core is to use stream conversion encoding.

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