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"%>
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 ="text:" + myXMLDoc.Value + "
";
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 = "
" + "Total number of elements:" + nElements + "
";
sWorkingText += "Total number of attributes in document:" + nAttributes + "
";
sWorkingText += "Total comments:" + nComments + "
";
sWorkingText += "Total processingInstructions:" + nPIs + "
";
sWorkingText += "Total CDATA sections:" + nCDATAs;
resultArea.Text += sWorkingText;
}
catch(XMLException exec)
{
sWorkingText = "Exception while parsing:" + "
";
sWorkingText += "Line number:" + exec.LineNumber + "
";
sWorkingText += "Message:" + exec.Message + "
" + "
";
sWorkingText += "Line position:" + exec.LinePosition + "
";
sWorkingText += "Stack Trace:" + "
" + 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 += "Validation warning: " + e.Message + "
";
}
else
{
resultArea.Text += "Validation errors: " + e.Message + "
";
}
}

