C#读取xml文档 [英] C# reading through xml documents
本文介绍了C#读取xml文档的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
public void checkOnline()
{
try
{
XmlTextReader reader = new XmlTextReader("http://api.own3d.tv/liveCheck.php?live_id=" + id);
bool done = false;
while (reader.Read() && !done)
{
switch (reader.NodeType)
{
case XmlNodeType.Text:
if (streamOnline != bool.Parse(reader.Value) && !overridden)
{
streamOnline = bool.Parse(reader.Value);
if (streamOnline)
{
onlineStreams++;
}
else
{
onlineStreams--;
}
Announce();
}
break;
case XmlNodeType.EndElement:
done = true;
Console.WriteLine(nick + " online = " + streamOnline); // prints streamnamehere online = true/false
break;
}
}
}
catch (XmlException)
{
Console.WriteLine("File not found.");
}
}
例如，它读取的XML是:
the XML it reads from for example is:
<own3dReply>
<liveEvent>
<isLive>true</isLive>
<liveViewers>91</liveViewers>
<liveDuration>137990</liveDuration>
</liveEvent>
</own3dReply>
它读取以查看isLive是否为真
但是，我需要从 http://api.justin.tv/api/stream/list读取XML .xml?channel = [^ ]
例如，它读取的XML是:
it reads to see if isLive is true
However, I need to read xml from http://api.justin.tv/api/stream/list.xml?channel=[^]
the XML that it reads from for example is:
<streams>
<stream>
<broadcast_part>1</broadcast_part>
<featured>True</featured>
<channel_subscription>True</channel_subscription>
<audio_codec>mp3</audio_codec>
<embed_count>73</embed_count>
<id href="/stream/show/2283462752.xml">2283462752</id>
<category>gaming</category>
<title>Showcraft - Monday/Wednesday 19:00 GMT - Vote Totalbiscuit King of the Web for charity! - http://tinyurl.com/votetotalbiscuit</title>
<video_height>720</video_height>
<site_count>669</site_count>
<embed_enabled>True</embed_enabled>
<up_time>Wed Dec 21 11:00:28 2011</up_time>
<meta_game>StarCraft II: Wings of Liberty</meta_game>
<format>live</format>
<stream_type>live</stream_type>
<channel_count>1490</channel_count>
<abuse_reported>False</abuse_reported>
<video_width>1280</video_width>
<geo>SE</geo>
<name href="/stream/show/live_user_totalbiscuit.xml">live_user_totalbiscuit</name>
<language>en</language>
<stream_count>742</stream_count>
<video_bitrate>1581.1953125</video_bitrate>
<channel>
<subcategory nil="true"/>
<category>gaming</category>
<id>12616386</id>
<login>totalbiscuit</login>
<title>SHOUTcraft</title>
<status>Showcraft - Monday/Wednesday 19:00 GMT - Vote Totalbiscuit King of the Web for charity! - http://tinyurl.com/votetotalbiscuit</status>
<tags/>
<producer>true</producer>
<category_title>Gaming</category_title>
<subcategory_title nil="true"/>
<producer>true</producer>
<language>en</language>
<timezone>Europe/London</timezone>
<channel_url>http://www.justin.tv/totalbiscuit</channel_url>
<mature nil="true"/>
<image_url_huge>http://static-cdn.jtvnw.net/jtv_user_pictures/totalbiscuit-profile_image-e1a17a8ba4a361e3-600x600.png</image_url_huge>
<image_url_large>http://static-cdn.jtvnw.net/jtv_user_pictures/totalbiscuit-profile_image-e1a17a8ba4a361e3-300x300.png</image_url_large>
<image_url_medium>http://static-cdn.jtvnw.net/jtv_user_pictures/totalbiscuit-profile_image-e1a17a8ba4a361e3-150x150.png</image_url_medium>
<image_url_small>http://static-cdn.jtvnw.net/jtv_user_pictures/totalbiscuit-profile_image-e1a17a8ba4a361e3-70x70.png</image_url_small>
<image_url_tiny>http://static-cdn.jtvnw.net/jtv_user_pictures/totalbiscuit-profile_image-e1a17a8ba4a361e3-50x50.png</image_url_tiny>
<screen_cap_url_huge>http://static-cdn.jtvnw.net/previews/live_user_totalbiscuit-630x473.jpg</screen_cap_url_huge>
<screen_cap_url_large>http://static-cdn.jtvnw.net/previews/live_user_totalbiscuit-320x240.jpg</screen_cap_url_large>
<screen_cap_url_medium>http://static-cdn.jtvnw.net/previews/live_user_totalbiscuit-150x113.jpg</screen_cap_url_medium>
<screen_cap_url_small>http://static-cdn.jtvnw.net/previews/live_user_totalbiscuit-70x53.jpg</screen_cap_url_small>
<embed_enabled>true</embed_enabled>
<embed_code> <object type="application/x-shockwave-flash" height="295" width="353" id="live_embed_player_flash" data="http://www.justin.tv/widgets/live_embed_player.swf?channel=totalbiscuit" bgcolor="#000000"><param name="allowFullScreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="movie" value="http://www.justin.tv/widgets/live_embed_player.swf" /><param name="flashvars" value="start_volume=25&channel=totalbiscuit&auto_play=false" /></object>
</embed_code>
<views_count><& get mongo users.totalbiscuit.views_count 0 &></views_count>
</channel>
<broadcaster>fme</broadcaster>
<video_codec>AVC</video_codec>
<channel_view_count>10627022</channel_view_count>
</stream>
</streams>
当流为 LIVE 时，它仅显示此XML.当它不存在时，XML文件中存在的所有内容是:
It ONLY shows this XML when the stream is LIVE. When it''s not live, all that exists in the XML file is:
<results/>
我的问题是，如何使用以上读取XML的方法读取此XML文件?我需要做的就是读取文件，如果找到
MY QUESTION IS, how can I use my above method of reading XML to read this XML file? All I need to do is read the file, if it finds
<results/>，则根据我的代码，它必须处于脱机状态.如果找不到(或者找到
, then according to my code, it has to be offline. If I don''t find it (or rather find
<streams>)，则表示它在线.但是，我该如何使用与我的代码相同的方式来做呢?任何帮助将不胜感激.
), it would mean it''s online. But how do I do it the same way I did with my code? Any help would be appreciated.
推荐答案
您要么尝试通过使用某些标志在while循环中进行检查(bool firstElement = true，bool offline = false- > if(firstElement && reader.Name =="results"){offline = true; break;} firstElement = false;-我不确定此处的属性Name是否正确)，或者可以使用XmlDocument和XPath-但随后您必须先阅读整个流，然后才能对其进行处理.
当您拥有XmlDocument时，可以轻松检查是否存在特定节点.
Either you try to check this in the while-loop by using some flags (bool firstElement = true, bool offline = false --> if (firstElement && reader.Name == "results") { offline = true; break; } firstElement = false; - I am not sure whether the property Name is correct here) or you could use XmlDocument and XPath - but then you have to read the whole stream before you can process it.
When you have a XmlDocument you can easily check whether a specific node exists.
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