这段时间,我正在学习XML,书上介绍使用Xerces-C或Xerces-J来验证XML文档的Schema或DTD,结果,发现上面的工具不好用.
后来,只有放下书,到书店看看,有没有其他什么书能带来帮助.当检到Professiona ASP.NET XML with C# 这本书时,里面讲到了使用System.Xml 和 System.Xml.Schema命名空间下的XmlTextReader类和XmlValidatingReader类来验证带有Schema或DTD的XML文档.便买下来了.
回寝室后,根据书里面面的介绍,写了一个小的测试程序,发现还很管用,在这里,但贴出来,希望给需要的人有帮助.
代码如下:
<%@Page Debug="true"%> <%@Import Namespace="System"%> <%@Import Namespace="System.Xml"%> <%@Import Namespace="System.Xml.Schema"%> <script language="C#" runat="server"> protected void uploadBtn_Click(Object sender,EventArgs e) { XmlTextReader myXml = null; XmlValidatingReader myXmlDoc = null; int nElements = 0; //统计文档中element的个数 int nAttributes = 0; //统计文档中Attributes的个数 int nComments = 0; //统计文档中 Comment的个数 int nPIs = 0; //统计文档中ProcessingInstruction的个数 int nCDATAs = 0; //统计文档中CDATA的个数 string sWorkingText = ""; resultArea.Text = ""; try { //装载XML Document myXml = new XmlTextReader(fileSelector.PostedFile.InputStream); myXml.WhitespaceHandling = WhitespaceHandling.None; //XmlValidatingReader是XmlTextReader的帮助功能 //需要从XmlTextReader对象获取实例 myXmlDoc = new XmlValidatingReader(myXml); myXmlDoc.ValidationType = ValidationType.Auto; //验证事件委托的签名 myXmlDoc.ValidationEventHandler += new ValidationEventHandler(this.ValidationEventCallBack);
//在遍历XML文档的时候,XmlValidatingReadert将根据Schema或DTD //对XML进行验证。 while(myXmlDoc.Read()) { //这里面的语句的作用主要是分析XML文档各NODE, //但while循环还是必要,因为只有逐个遍历所有个的NODE,才会检查出验证是否匹配。 switch(myXmlDoc.NodeType) //Judge Crrent Node's type. 判定当前结点的类型 { case XmlNodeType.Element : // Element 元素 ++nElements; nAttributes += myXmlDoc.AttributeCount; break; case XmlNodeType.Text : //文本内容 sWorkingText ="<b>text:</b>" + myXmlDoc.Value + "<br/>"; resultArea.Text += sWorkingText; break; case XmlNodeType.Comment: //注释 ++nCommen; break; case XmlNodeType.ProcessingInstruction: //处理指令 ++nPIs; break; case XmlNodeType.CDATA: //CDATA ++nCDATAs; break; } } sWorkingText = "<br/>" + "Total number of elements:" + nElements + "<br/>"; sWorkingText += "Total number of attributes in document:" + nAttributes + "<br/>"; sWorkingText += "Total comments:" + nComments + "<br/>"; sWorkingText += "Total processingInstructions:" + nPIs + "<br/>"; sWorkingText += "Total CDATA sections:" + nCDATAs; resultArea.Text += sWorkingText; } catch(XmlException exec) { sWorkingText = "Exception while parsing:" + "<br/>"; sWorkingText += "Line number:" + exec.LineNumber + "<br/>"; sWorkingText += "Message:" + exec.Message + "<br/>" + "<br/>"; sWorkingText += "Line position:" + exec.LinePosition + "<br/>"; sWorkingText += "Stack Trace:" + "<br/>" + exec.StackTrace; resultArea.Text = sWorkingText; } finally { if (myXmlDoc!=null) { myXmlDoc.Close(); } } } //验证事件 public void ValidationEventCallBack(Object sender,ValidationEventArgs e) { if (e.Severity == XmlSeverityType.Warning)//区分是警告还是错误 { resultArea.Text += "<b>Validation warning: </b>" + e.Message + "<br/>"; } else { resultArea.Text += "<b>Validation errors: </b>" + e.Message + "<br/>"; } } </script> <html> <head><title>XmlTextReader</title></head> <body> <form method="post" runat="server"> <asp:Label Font-Size="10pt" runat="server">上传XML文档 在服务器验证</asp:Label><br/> <input type="file" size="40" runat="server" id="fileSelector"> <br/> <asp:Button id="uploadBtn" Text="提交" onClick="uploadBtn_Click" runat="server"/><br/> <asp:Label Font-Size="12pt" id="resultArea" runat="server"/><br/> </form> </body> </html>
如果对实现功能有兴趣,可以翻阅相关的书或.Net Framework文档来熟悉XmlTextReader和XmlValidatingReader.
代码编写有不成熟的地方请多指教!谢谢! 
|