XmlReader 读取器读取内存流 MemoryStream 的注意事项
MemoryStream对象提供了无需进行IO就可以创建Stream的方法，XmlTextWriter和XmlReader提供快速书写和读取XML内容的方法，结合MemoryStream，就可以直接在内存中构造XmlTextWriter，并用XmlReader进行读取。
使用MemoryStream和XmlTextWriter进行书写XML,需要注意两点：XmlTextWriter.Flush操作和重设MemoryStream.Position = 0。
<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>XmlReader 读取器读取内存流 MemoryStream 的注意事项</title></head><body> <form id="form1" runat="server"> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="读取数据" /> </form></body></html>
protected void Button1_Click(object sender, EventArgs e)
{
Response.Clear(); Response.ContentType = "text/xml"; MemoryStream msXml = new MemoryStream(); XmlTextWriter xmlWriter = new XmlTextWriter(msXml, Encoding.UTF8); xmlWriter.WriteStartElement("rss"); xmlWriter.WriteAttributeString("version", "2.0"); xmlWriter.WriteStartElement("channel"); xmlWriter.WriteElementString("title", "【孟宪会之精彩世界】"); xmlWriter.WriteElementString("link", "http://dotnet.aspx.cc/Rss.aspx"); xmlWriter.WriteElementString("description", "NET开发技术。"); xmlWriter.WriteElementString("language", "zh-CN"); xmlWriter.WriteElementString("copyright", "Copyright 1999-2007【孟宪会之精彩世界】"); xmlWriter.WriteElementString("managingEditor", "amxh[AT]21cn.com"); xmlWriter.WriteStartElement("image"); xmlWriter.WriteElementString("title", "【孟宪会之精彩世界】"); xmlWriter.WriteElementString("width", "144"); xmlWriter.WriteElementString("height", "35"); xmlWriter.WriteElementString("link", "http://dotnet.aspx.cc/"); xmlWriter.WriteElementString("url", "http://dotnet.aspx.cc/Images/LogoRss.gif"); xmlWriter.WriteEndElement(); //循环读出数据库内容列表，忽略 //while (objReader.Read()) //{ // xmlWriter.WriteStartElement("item"); // xmlWriter.WriteElementString("title", objReader.GetString(0)); // xmlWriter.WriteElementString("description", objReader.GetString(1)); // xmlWriter.WriteElementString("link", "http://dotnet.aspx.cc/article/a933b187-06c3-4263-9eec-414a54d9c815/read.aspx"); // xmlWriter.WriteElementString("pubDate", objReader.GetDateTime(3).ToString("G")); // xmlWriter.WriteEndElement(); //} //objReader.Close(); xmlWriter.WriteStartElement("item"); xmlWriter.WriteElementString("title", "ASP.NET 2.0中直接将Access数据库导入到Excel文件中"); xmlWriter.WriteElementString("description", "ASP.NET 2.0中直接将Access数据库导入到Excel文件中"); xmlWriter.WriteElementString("link", "http://dotnet.aspx.cc/article/a933b187-06c3-4263-9eec-414a54d9c815/read.aspx"); xmlWriter.WriteElementString("pubDate", "Sat, 02 Dec 2006 09:39:58 GMT"); xmlWriter.WriteEndElement(); xmlWriter.WriteEndElement(); xmlWriter.WriteEndElement(); xmlWriter.Flush(); // 确保书写器更新到Stream中； msXml.Position = 0; // 重置流的位置，以便我们可以从头读取 XmlReader xmlReader = XmlReader.Create(msXml); while (xmlReader.Read())
{
if (xmlReader.Name == "rss") { Response.Write(xmlReader.ReadOuterXml());
} } Response.End(); msXml.Close(); xmlWriter.Close(); xmlReader.Close();
}
