使用XmlSchema验证xml的正确性

XmlTextReader
XmlValidatingReader
XmlSchemaCollection
ValidationType = ValidationType.Schema;
vr.ValidationEventHandler += new ValidationEventHandler (ValidationHandler);

code in quickstart from asp.net

<%@ Webservice Language="C#" Class="MessageValidationService" %>

using System;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml;
using System.Xml.Serialization;
using System.Xml.Schema;
using System.IO;

[WebService(Namespace="Microsoft.Samples.XmlMessaging.WebServices")]
public class MessageValidationService {

   private string returnMessage = "Success! Validation was successful.";
   
   [WebMethod]
   public string SendToValidator(string input)
   {
      XmlTextReader tr = new XmlTextReader(input, XmlNodeType.Document, null);
      XmlValidatingReader vr = new XmlValidatingReader(tr);

      XmlSchemaCollection schemas = new XmlSchemaCollection();
      schemas.Add("Microsoft.Samples.Web.Services", "http://66.129.71.130/quickstartv20/ webservices/samples/ MessageValidation/Book.xsd");
      vr.Schemas.Add(schemas);
      vr.ValidationType = ValidationType.Schema;
      vr.ValidationEventHandler += new ValidationEventHandler (ValidationHandler);

      try
      {
          while (vr.Read())
          {
              //do nothing 
          }
      }
      catch (Exception exception)
      {
          returnMessage = "Failure. An Exception was received, most likely indicating malformed XML. Message: " + exception.Message;
      }
      return returnMessage;      
   }

   public void ValidationHandler(object sender, ValidationEventArgs args)
   {
      returnMessage = "Failure. Validation was not successful. Message: " + args.Message;  
   }  
}

参考：Validate Messages QuickStart in Asp.net