轻量级Config文件AppSettings节点编辑帮助类

 using System.Configuration;
 using System.Windows.Forms;

 namespace Allyn.Common
 {
     public class XmlHeper
     {
         ///<summary>
         ///返回Config文件中appSettings配置节的value项
         ///</summary>
         ///<param name="strKey">节点Key</param>
         ///<returns>值</returns>
         public static string GetAppConfig(string strKey)
         {
             string file = Application.ExecutablePath;
             Configuration config = ConfigurationManager.OpenExeConfiguration(file);

             foreach (string key in config.AppSettings.Settings.AllKeys)
             {
                 if (key == strKey)
                 {
                     return config.AppSettings.Settings[strKey].Value.ToString();
                 }
             }
             return string.Empty;
         }

         ///<summary>
         ///在Config文件中appSettings配置节增加一对键值对
         ///</summary>
         ///<param name="newKey">节点名称</param>
         ///<param name="newValue">信值</param>
         public static void UpdateAppConfig(string newKey, string newValue)
         {
             string file = System.Windows.Forms.Application.ExecutablePath;
             Configuration config = ConfigurationManager.OpenExeConfiguration(file);

             bool exist = false;

             foreach (string key in config.AppSettings.Settings.AllKeys)
             {
                 if (key == newKey) {  exist = true; }
             }

             if (exist)  { config.AppSettings.Settings.Remove(newKey); }

             config.AppSettings.Settings.Add(newKey, newValue);
             config.Save(ConfigurationSaveMode.Modified);

             ConfigurationManager.RefreshSection("appSettings");
         }
     }
 }