AppConfig的操作

2017-02-21 18:17:21 访问(1476) 赞(0) 踩(0)


using System;
using System.Xml;
using System.Configuration;
using System.Collections;
using System.Reflection;
using System.Diagnostics;

using CT.BA.Classes.Loger;

namespace CT.BA.Classes.Functions
{
    /// <summary>
    /// 配置文件类型
    /// </summary>
    public enum ConfigFileType
    {
        WebConfig,
        AppConfig
    }

    /// <summary>
    /// AppConfig的操作
    /// </summary>
    public class AppConfig 
        : 
        System.Configuration.AppSettingsReader
    {
        /// <summary>
        /// 只能用保护，不然反射不到
        /// </summary>
        protected static AppConfig m_instance = null;

        /// <summary>
        /// 设置AppConfig的默认实体
        /// </summary>
        /// <param name="_instance"></param>
        public static void SetInstance(AppConfig _instance)
        {
            m_instance = _instance;
        }

        /// <summary>
        /// 获得AppConfig的实体
        /// </summary>
        public static AppConfig instance
        {
            get
            {
                if (m_instance == null)
                {
                    // throw new Exception("未有系统实例化！");
                    m_instance = new AppConfig();
                }

                return m_instance;
            }
        }

        /// <summary>
        /// 配置文件的路径值
        /// </summary>
        public string docName = String.Empty;

        /// <summary>
        /// 
        /// </summary>
        private XmlNode node = null;

        /// <summary>
        /// 配置文件类型
        /// </summary>
        private int _configType;

        /// <summary>
        /// 配置文件类型
        /// </summary>
        public int ConfigType
        {
            get
            {
                return _configType;
            }
            set
            {
                _configType = value;
            }
        }



        /// <summary>
        /// 设置节点值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public bool SetValue(string key, string value)
        {
            XmlDocument cfgDoc = new XmlDocument();

            loadConfigDoc(cfgDoc);

            // retrieve the appSettings node 
            node = cfgDoc.SelectSingleNode("//appSettings");

            if (node == null)
            {
                throw new System.InvalidOperationException("appSettings section not found");
            }

            try
            {
                // XPath select setting "add" element that contains this key    
                XmlElement addElem = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");
                if (addElem != null)
                {
                    addElem.SetAttribute("value", value);
                }
                // not found, so we need to add the element, key and value
                else
                {
                    XmlElement entry = cfgDoc.CreateElement("add");
                    entry.SetAttribute("key", key);
                    entry.SetAttribute("value", value);
                    node.AppendChild(entry);
                }
                //save it
                saveConfigDoc(cfgDoc, docName);
                return true;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 保存节点配置
        /// </summary>
        /// <param name="cfgDoc"></param>
        /// <param name="cfgDocPath"></param>
        public void saveConfigDoc(XmlDocument cfgDoc, string cfgDocPath)
        {
            try
            {
                XmlTextWriter writer = new XmlTextWriter(cfgDocPath, null);
                writer.Formatting = Formatting.Indented;
                cfgDoc.WriteTo(writer);
                writer.Flush();
                writer.Close();
                return;
            }
            catch(Exception err)
            {
                Recorder.Record(err);
    
                throw err;
            }
        }

        /// <summary>
        /// 移除节点
        /// </summary>
        /// <param name="elementKey"></param>
        /// <returns></returns>
        public bool removeElement(string elementKey)
        {
            try
            {
                XmlDocument cfgDoc = new XmlDocument();
                loadConfigDoc(cfgDoc);
                // retrieve the appSettings node 
                node = cfgDoc.SelectSingleNode("//appSettings");
                if (node == null)
                {
                    throw new System.InvalidOperationException("appSettings section not found");
                }
                // XPath select setting "add" element that contains this key to remove   
                node.RemoveChild(node.SelectSingleNode("//add[@key='" + elementKey + "']"));

                saveConfigDoc(cfgDoc, docName);
                return true;
            }
            catch(Exception err)
            {
                throw err;
            }
        }

        /// <summary>
        /// 加载节点
        /// </summary>
        /// <param name="cfgDoc"></param>
        /// <returns></returns>
        public XmlDocument loadConfigDoc(XmlDocument cfgDoc)
        {
            // load the config file 
            if (Convert.ToInt32(ConfigType) == Convert.ToInt32(ConfigFileType.AppConfig))
            {

                docName = ((Assembly.GetEntryAssembly()).GetName()).Name;
                docName += ".exe.config";
            }
            else
            {
                docName = System.Web.HttpContext.Current.Server.MapPath("web.config");
            }

            cfgDoc.Load(docName);
            
            return cfgDoc;
        }

    }

}