using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Xml;
using System.Xml.Schema;
using System.IO;

namespace XsdXmlSample
{
    class Program
    {
        const string XML_FILE_NAME = "PRItems.xml";
        const string SCHEMA_FILE_NAME = "Schema.xsd";

        static void Main(string[] args)
        {

            if (ValidateXML(XML_FILE_NAME,SCHEMA_FILE_NAME))
            {
                Console.WriteLine("Validate Sucess!");
                Console.ReadLine();
            }

        }



        static bool ValidateXML(string xmlFile,string schemaFile)
        {
            bool isValid = true;

            try
            {
                //
                XmlSchemaSet schemaSet = new XmlSchemaSet();
                schemaSet.Add(null,schemaFile);
                XmlReaderSettings readerSetting = new XmlReaderSettings();
                readerSetting.ValidationType = ValidationType.Schema;                
                readerSetting.Schemas = schemaSet;

                //
                using (XmlReader xmlReader = XmlReader.Create(xmlFile, readerSetting))
                {
                    while (xmlReader.Read())
                    {  }
                }

            }
            catch (Exception ex)
            {
                isValid = false;
                Console.WriteLine("Validate Failure! Error: {0}",ex.Message);
            }

            return isValid;
        }

    }
}

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="PRItemSchema"
    targetNamespace="http://tempuri.org/schema.xsd"
    elementFormDefault="qualified"
    xmlns="http://tempuri.org/schema.xsd"
    xmlns:mstns="http://tempuri.org/schema.xsd"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
>
  <xs:element name="PRItem">
    <xs:complexType>
      <xs:group ref="ItemGroup" minOccurs="1" maxOccurs="unbounded" />
    </xs:complexType>
  </xs:element>

  <xs:group name="ItemGroup">
    <xs:sequence>
      <xs:element name="Item">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Company" type="xs:string" />
            <xs:element name="PR_No" type="xs:string" />
            <xs:element name="PR_Line" type="xs:int" />
            <xs:element name="PO_No" type="xs:string" />
            <xs:element name="PR_Complete" type="xs:boolean" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>  
  </xs:group>
</xs:schema>

<?xml version="1.0" encoding="utf-8" ?>
<PRItem>
  <Item>
    <Company>KK-GZ</Company>
    <PR_No>PP-2012063001</PR_No>
    <PR_Line>200</PR_Line>
    <PR_Complete>True</PR_Complete>
    <PO_No>PX-2012063001</PO_No>
  </Item>
  <Item>
    <Company>KK-GZ</Company>
    <PR_No>PP-2012063002</PR_No>
    <PR_Line>232</PR_Line>
    <PR_Complete>False</PR_Complete>
    <PO_No>PX-2012063002</PO_No>
  </Item>
</PRItem>

<?xml version="1.0" encoding="utf-8" ?>
<PRItem>

</PRItem>

***********************************************
通过！！！


<?xml version="1.0" encoding="utf-8" ?>
<PRItem>
  <Item>

    <PR_Complete>True</PR_Complete>
    <PO_No>PX-2012063001</PO_No>
  </Item>
  <Item>
    <Company>KK-GZ</Company>
    <PR_No>PP-2012063002</PR_No>

  </Item>
</PRItem>

***********************************************
又通过！！！


<?xml version="1.0" encoding="utf-8" ?>
<OK></OK>

***********************************************
还通过！！！

Oh,Shit . 我无语了。。。