using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Xml;

namespace Utility
{
    /// <summary>
    /// 配置文件讀寫
    /// </summary>
    public class ConfigFileManage
    {
        #region App配置文件讀寫
        /// <summary>
        /// 獲取App配置文件的鍵值，無節點則出錯，出錯則自動添加節點，重試即可使用
        /// </summary>
        /// <param name="KeyName">鍵名</param>
        /// <returns>鍵值</returns>
        public static string GetAppKeyValue(string KeyName)
        {
            try
            {
                return System.Configuration.ConfigurationManager.AppSettings[KeyName].ToString();
            }
            catch (Exception ex)
            {
                Pub.ShowError(ex, "System", "Pub", "GetAppKeyValue");
                SetAppKeyValue(KeyName, "", "");//無節點則出錯，出錯則自動添加節點
                return "";
            }
        }

        /// <summary>
        /// 設置App配置文件的鍵值（通過XML操作）
        /// </summary>
        /// <param name="KeyName">鍵名</param>
        /// <param name="KeyValue">鍵值</param>
        /// <param name="FilePath">Config文件路徑,默認路徑就用“”即可</param>
        public static void SetAppKeyValue(string KeyName, string KeyValue, string FilePath)
        {
            #region 判斷配置文件是否存在
            if (FilePath == "")
            {
                FilePath = System.IO.Path.Combine(Application.StartupPath, "App.Config");
            }
            else if (!File.Exists(FilePath))
            {
                FilePath = System.IO.Path.Combine(Application.StartupPath, "App.Config");
            }

            if (!File.Exists(FilePath))
            {
                FilePath = Application.ExecutablePath + ".Config";
            }
            if (!File.Exists(FilePath))
            {
                FilePath = Pub.AppConifgName;
            }
            if (!File.Exists(FilePath))
            {
                //獲取安裝路徑
                System.Reflection.Assembly asm = System.Reflection.Assembly.GetExecutingAssembly();
                string LocalPath = asm.Location;
                FilePath = System.IO.Path.Combine(Path.GetDirectoryName(LocalPath), Pub.AppConifgName);
            }
            //Traces(FilePath);
            if (!File.Exists(FilePath))
            {
                return;
            }
            #endregion

            bool BoolKeyName = false;

            try
            {
                #region XML操作配置文件
                XmlDocument xmldoc = new XmlDocument();
                xmldoc.Load(FilePath);

                XmlNodeList topM = xmldoc.DocumentElement.ChildNodes;
                foreach (XmlElement element in topM)
                {
                    #region 遍歷節點，找到AppSeting節點
                    if (element.Name.ToLower() == "appsettings")
                    {
                        XmlNodeList _node = element.ChildNodes;
                        if (_node.Count > 0)
                        {
                            foreach (XmlNode el in _node)
                            {
                                if (el.Name[0].ToString() == "#")
                                {
                                    continue;
                                }
                                if (el.Attributes["key"].InnerXml.ToLower() == KeyName.ToLower())
                                {
                                    BoolKeyName = true;
                                    el.Attributes["value"].Value = KeyValue;//此值需下次程序才生效
                                    //如要本次就使用修改后的值，可將鍵值，在緩存中的AppSettings進行修改，代碼如下：
                                    System.Configuration.ConfigurationManager.AppSettings.Set(KeyName, KeyValue);
                                }
                            }
                        }

                        if (!BoolKeyName)
                        {
                            XmlElement xel = xmldoc.CreateElement("add");
                            xel.SetAttribute("key", KeyName);
                            xel.SetAttribute("value", KeyValue);
                            XmlNode xnode = xmldoc.SelectSingleNode("//appSettings");
                            xnode.AppendChild(xel);
                        }
                    }
                    #endregion
                }
                xmldoc.Save(FilePath);
                #endregion
            }
            catch (Exception ex)
            {
                Pub.ShowError(ex.Message);
            }
        }
        #endregion 
    }
}