| .Net/C#: 利用反射编写通用的 rss 2.0 的 reader__教程 |
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| 日期：2007-5-20 1:25:45 人气：137 [大 中 小] |
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{
get
{
return this._rs;
}
}
//用于存储所有的 RssItem
private RssItem[] _RssItems;
public RssItem[] RssItems
{
get
{
return this._RssItems;
}
}
public void Rss(string URL)
{
XmlDocument xd = new XmlDocument();
//如果效率不高可采用 WebRequest 替代
xd.Load(URL);
XmlNodeList xnl = xd.SelectNodes("/rss/channel");
this._rs = new RssHeader(URL);
this._TRS = typeof(RssHeader);
this._tri = typeof(RssItem);
this._RssItemsAL = new ArrayList();
foreach (XmlNode xn in xnl)
{
//递归遍历
this.Travel(xn, 0);
}
if (this._RssItemsAL.Count > 0)
{
this._RssItems = new RssItem[this._RssItemsAL.Count];
int i = 0;
foreach (object o in this._RssItemsAL)
{
this._RssItems[i++] = (RssItem) o;
}
}
}
///
/// 节点
/// 项目数
private void Travel(XmlNode xn, int i)
{
if (xn.HasChildNodes)
{
foreach (XmlNode x in xn.ChildNodes)
{
if (x.ParentNode != null)
{
if (x.ParentNode.Name == "channel")
{
if (x.Name == "item")
{
i ++;
if (i >= 1)
{
XmlNode node = null;
bool b = false; //是否是 Rss Item
RssItem ri = null;
if (i == 1) //Header
{
node = xn;
b = false;
}
else if (i > 1) //Item
{
node = x;
b = true;
ri = new RssItem();
}
foreach (XmlNode n in node.ChildNodes)
{
if (n.Name != "item")
{
if (!b) //Rss Header Header
{
//根据 XML 实际存在的属性,利用反射为 RssHeader 实例的私有成员赋值
FieldInfo fi = this._TRS.GetField("_" + n.Name.Replace(":","") ,BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public);
if (fi != null)
{
fi.SetValue(this._rs,n.InnerText);
}
}
else //Rss Item
{
//根据 XML 实际存在的属性,利用反射为 RssItem 实例的私有成员赋值
FieldInfo fi = this._tri.GetField("_" + n.Name.Replace(":",""),BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public);
if (fi != null)
{
fi.SetValue(ri,n.InnerText);
}
}
}
}
if (!b)
{
//触发 RssHeaderReceive 事件
if (this.RssHeaderReceive != null)
{
this.RssHeaderReceive(this,this._rs);
}
}
else
{
//制定 RssItem 实例的 Header/Header
FieldInfo fi = this._tri.GetField("_Header",BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public);
if (fi != null)
{
fi.SetValue(ri,this._rs);
}
//触发 RssItemReceive 事件
if (this.RssItemReceive != null)
{
this.RssItemReceive(this,ri);
}
this._RssItemsAL.Add(ri);
}
}
}
}
}
if (!x.HasChildNodes)
{
this.Travel(x, i);
}
}
}
}
}
public class Util
{
public static DateTime ParseDateTime(string s)
{
DateTime dt;
if (s == null || s.ToString().Length <= 0)
{
dt = DateTime.Now; |
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| 出处：本站原创 作者：佚名 |
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