C#XSD文件校验XML文件和字符串

        /// 

        /// 通过xsd验证xml格式是否正确，正确返回空字符串，错误返回提示
        /// 
        /// xml文件
        /// xsd文件
        /// 命名空间，无则默认为null
        /// 
        public static string XmlValidationByXsd(string xmlFile, string xsdFile, string namespaceUrl = null)
        {
            StringBuilder sb = new StringBuilder();
            XmlReaderSettings settings = new XmlReaderSettings();
            settings.ValidationType = ValidationType.Schema;
            settings.Schemas.Add(namespaceUrl, xsdFile);
            //验证出错时执行 第一种写法            
            settings.ValidationEventHandler += new ValidationEventHandler(delegate (object sender, ValidationEventArgs e)
            {
                switch (e.Severity)
                {
                    case XmlSeverityType.Error:
                        break;
                    case XmlSeverityType.Warning:
                        break;
                }                
                throw e.Exception;
            });      

            using (XmlReader reader = XmlReader.Create(xmlFile, settings))
            {
                try
                {
                    while (reader.Read()) ;
                }
                catch (Exception ex)
                {
                    sb.AppendFormat("{0}|", ex.Message);
                }
            }
            return sb.ToString();
        }

        /// 
  
        /// 通过xsd验证xml格式是否正确，正确返回空字符串，错误返回提示  
        /// 
  
        /// xml文本内容  
        /// xsd文件  
        ///   
        public static string XmlValidateByXsd(string xmlText, string schemaFile)
        {
            StringBuilder sb = new StringBuilder();
            XmlReaderSettings settings = new XmlReaderSettings();
            settings.ValidationType = ValidationType.Schema;
            settings.Schemas.Add(null, schemaFile);
            settings.ValidationEventHandler += (x, y) =>
            {
                sb.AppendFormat("{0}\n", y.Message);
            };
            using (XmlReader reader = XmlReader.Create(new StringReader(xmlText), settings))
            {
                try
                {
                    while (reader.Read()) ;
                }
                catch (XmlException ex)
                {
                    sb.AppendFormat("{0}\n", ex.Message);
                }
            }
            return sb.ToString();
        }
        /// 

        /// 通过xsd验证xml格式是否正确
        /// 
        /// xml文本内容
        /// xsd文件
        /// 
        private bool XMLcheckXsd(string xmldata, string xsdPath)
        {
            bool rtn = false;
            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(xmldata));
            ms.Position = 0;

            XmlReaderSettings settings = new XmlReaderSettings();
            settings.ValidationType = ValidationType.Schema;
            settings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings;
            settings.IgnoreComments = true;
            settings.IgnoreWhitespace = true;
            settings.Schemas.Add(null, xsdPath);

            using (XmlReader xmlReader = XmlReader.Create(ms, settings))
            {
                try
                {
                    XmlDocument xmlDocument = new XmlDocument();
                    xmlDocument.Load(xmlReader);
                    xmlDocument.Validate(ValidationCallBack);
                    rtn = true;
                }
                catch(Exception ex)
                {
                    rtn = false;
                }
            }
            return rtn;
        }
        private void ValidationCallBack(object sender, ValidationEventArgs e)
        {
            Console.WriteLine(e.Message);
            throw e.Exception;
        }