C#XSD文件校验XML文件和字符串

/// <summary>/// 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/// </summary>/// <param name="xmlFile">xml文件</param>/// <param name="xsdFile">xsd文件</param>/// <param name="namespaceUrl">命名空间，无则默认为null</param>/// <returns></returns>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();}/// <summary>  /// 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  /// </summary>  /// <param name="xmlText">xml文本内容</param>  /// <param name="schemaFile">xsd文件</param>  /// <returns></returns>  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();}/// <summary>/// 通过xsd验证xml格式是否正确/// </summary>/// <param name="xmldata">xml文本内容</param>/// <param name="xsdPath">xsd文件</param>/// <returns></returns>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;}