步骤
１、开发dll(需要签名）

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Xml.Schema;


namespace ETLXmlParser
{
    public class ETLXmlParser
    {
        private static bool isValid = true;

        public static bool Validate(string XmlFilepath, string XsdFilePath)
        {
            try{
            XmlReader reader;
            XmlReaderSettings settings = new XmlReaderSettings();
            XmlSchemaSet schemaSet = new XmlSchemaSet();
            schemaSet.Add(null, XsdFilePath);
            settings.Schemas.Add(schemaSet);
            settings.ValidationType = ValidationType.Schema;

            settings.ValidationEventHandler += new ValidationEventHandler(settings_ValidationEventHandler);
            settings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings | XmlSchemaValidationFlags.ProcessInlineSchema | XmlSchemaValidationFlags.AllowXmlAttributes | XmlSchemaValidationFlags.ProcessIdentityConstraints | XmlSchemaValidationFlags.ProcessSchemaLocation;
            reader = XmlReader.Create(XmlFilepath, settings);
            while (reader.Read())
            {
                string xmlFile = reader.Value;
            }
            reader.Close();
            return isValid;
            }
            catch(Exception ex)
            {
                return false;
            }
        }

        private static void settings_ValidationEventHandler(object sender, ValidationEventArgs e)
        {
        
            isValid = false;
        }
    }
}

2 将编译好的dll拷贝到C:\Program Files\Microsoft SQL Server\90\DTS\PipelineComponents（SQL Server 安装目录）和C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727
3、将DLL拖进C:\WINDOWS\assembly文件夹，也可以用命令安装该dll（gacutil.exe /i myassembly.dll）
4 在SSIS中拖入一个Script Task,然后设计脚本，添加应用dll