📄 xml-via-navigator.aspx

📁 东软内部材料（四）asp等相关的教学案例　
💻 ASPX
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<%@Page Language="C#" %>
<%@Import Namespace="System.Xml" %>
<%@Import Namespace="System.Xml.XPath" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head>
<title>Accessing Xml documents using an XPathNavigator</title>
<!-- #include file="..\global\style.inc" -->
</head>
<body bgcolor="#ffffff">
<span class="heading">Accessing Xml documents using an XPathNavigator</span><hr />
<!--------------------------------------------------------------------------->

<div id="outDocURL" runat="server"></div>
<div id="outError" runat="server">&nbsp;</div>
<div id="outResults" runat="server"></div>

<script language="C#" runat="server">

	void Page_Load(Object sender, EventArgs e)
	{
		// create physical path to booklist.xml sample file (in same folder as ASPX page)
		string strCurrentPath = Request.PhysicalPath;
		string strXmlPath = strCurrentPath.Substring(0, strCurrentPath.LastIndexOf("\\")) + "\\booklist.xml";

		// declare a variable to hold an XmlDocument object
		XmlDocument objXmlDoc = new XmlDocument();

		try
		{
			// create a new XpathDocument object and load the Xml file
			objXmlDoc.Load(strXmlPath);
			outDocURL.InnerHtml = "Loaded file: <b>" + strXmlPath + "</b>";
		}
		catch (Exception objError)
		{

			// display error details
			outError.InnerHtml = "<b>* Error while accessing document</b>.<br />"
						+ objError.Message + "<br />" + objError.Source;
			return; //  and stop execution
		}

		// now ready to parse the Xml document
		// it must be well-formed to have loaded without error
		// create a new XPathNavigator object using the XmlDocument object
		XPathNavigator objXPNav = objXmlDoc.CreateNavigator();

		// move the current position to the root #document node
		objXPNav.MoveToRoot();

		// call a recursive function to iterate through all the nodes in the
		// XPathNavigator, creating a string that is placed in the <div> above
		outResults.InnerHtml = GetXmlDocFragment(objXPNav, 0);

	}


	string GetXmlDocFragment(XPathNavigator objXPNav, int intLevel)
	{
		string strNodes = "";
		int intLoop;

		// display information about this node
		strNodes = strNodes + GetIndent(intLevel)
					+ GetNodeType(objXPNav.NodeType) + ": <b>" + objXPNav.Name
					+ "</b>&nbsp; value=<b>" + objXPNav.Value + "</b><br />";

		// see if this node has any Attributes
		if (objXPNav.HasAttributes)
		{
			// move to the first attribute
			objXPNav.MoveToFirstAttribute();

			do
			{
				// display the information about it
				strNodes = strNodes + GetIndent(intLevel + 1)
						+ GetNodeType(objXPNav.NodeType) + ": <b>" + objXPNav.Name
						+ "</b>&nbsp; value=<b>" + objXPNav.Value + "</b><br />";
			}
			while (objXPNav.MoveToNextAttribute());

			// then move back to the parent node (i.e. the element itself)
			objXPNav.MoveToParent();
		}

		// see if this node has any child nodes
		if (objXPNav.HasChildren)
		{
			// move to the first child node of the current node
			objXPNav.MoveToFirstChild();

			do
			{
				// recursively call this function to display the child node fragment
				strNodes = strNodes + GetXmlDocFragment(objXPNav, intLevel + 1);
			}
			while (objXPNav.MoveToNext());

			// move back to the parent node - the node we started from when we
			// moved to the first child node - could have used Push and Pop instead
			objXPNav.MoveToParent();
		}

		// must repeat the process for the remaining sibling nodes (i.e.nodes
		// at the same // level' as the current node within the Xml document
		// so repeat while we can move to the next sibling node
		while (objXPNav.MoveToNext())
		{
			// recursively call this function to display this sibling node
			// and its atributes and child nodes
			strNodes = strNodes + GetXmlDocFragment(objXPNav, intLevel);
		}

		return strNodes; // pass the result back to the caller
	}


	string GetIndent(int intLevel)
	{
		// returns a string of non-breaking spaces used to indent each line
		string strIndent = "";
		for (int intIndent = 0; intIndent <= intLevel; intIndent++)
			strIndent = strIndent + "&nbsp; &nbsp; &nbsp; ";

		return strIndent;
	}


	string GetNodeType(XPathNodeType intType)
	{
		// returns the node type as a string
		switch (Convert.ToInt32(intType))
		{
		case 0: return "NONE";
		case 1: return "ELEMENT"; break;
		case 2: return "ATTRIBUTE"; break;
		case 3: return "TEXT"; break;
		case 4: return "CDATA SECTION"; break;
		case 5: return "ENTITY REFERENCE"; break;
		case 6: return "ENTITY"; break;
		case 7: return "PROCESSING INSTRUCTION"; break;
		case 8: return "COMMENT"; break;
		case 9: return "DOCUMENT"; break;
		case 10: return "DOCUMENT TYPE"; break;
		case 11: return "DOCUMENT FRAGMENT"; break;
		case 12: return "NOTATION"; break;
		case 13: return "WHITESPACE"; break;
		case 14: return "SIGNIFICANT WHITESPACE"; break;
		case 15: return "END ELEMENT"; break;
		case 16: return "END ENTITY"; break;
		case 17: return "Xml DECLARATION"; break;
		case 18: return "NODE (ALL)"; break;
		default: return "UNKNOWN"; break;
		}
		
	}

</script>

<!--------------------------------------------------------------------------->
<!-- #include file="..\global\foot.inc" -->
</body>
</html>
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