读取xml文件中节点

/// <summary>
/// 
/// </summary>
/// <param name="xmlpath">节点路径</param>
/// <param name="getLatest"></param>
/// <returns></returns>
public static string GetPropertyValue(string xmlpath, bool getLatest = false) {
            XmlDocument xml = new XmlDocument();
if (string.IsNullOrEmpty(_xmlFilePath)||!System.IO.File.Exists(_xmlFilePath))
            {
return null;
            }
try
            {
                xml.Load(_xmlFilePath);
                XmlNodeList nodes = xml.SelectNodes(xmlpath);
if (nodes==null)
                {
throw new AggregateException(string.Format("未找到文件XMLFile1.xml或不存在节点{0}", xmlpath));
                }
return nodes[0].InnerXml;
            }
catch (Exception e)
            {
throw new System.Exception(string.Format("请确认该XML文件格式正确，路径为：{0}", _xmlFilePath));
            }
        }