读写app.config AppSettings,保留注释与不保留注释

不保留

using System;
using System.Configuration;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            ReadAllSettings();
            ReadSetting("Setting1");
            ReadSetting("NotValid");
            AddUpdateAppSettings("NewSetting", "May 7, 2014");
            AddUpdateAppSettings("Setting1", "May 8, 2014");
            ReadAllSettings();
        }

        static void ReadAllSettings()
        {
            try
            {
                var appSettings = ConfigurationManager.AppSettings;

                if (appSettings.Count == 0)
                {
                    Console.WriteLine("AppSettings is empty.");
                }
                else
                {
                    foreach (var key in appSettings.AllKeys)
                    {
                        Console.WriteLine("Key: {0} Value: {1}", key, appSettings[key]);
                    }
                }
            }
            catch (ConfigurationErrorsException)
            {
                Console.WriteLine("Error reading app settings");
            }
        }

        static void ReadSetting(string key)
        {
            try
            {
                var appSettings = ConfigurationManager.AppSettings;
                string result = appSettings[key] ?? "Not Found";
                Console.WriteLine(result);
            }
            catch (ConfigurationErrorsException)
            {
                Console.WriteLine("Error reading app settings");
            }
        }

        static void AddUpdateAppSettings(string key, string value)
        {
            try
            {
                var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                var settings = configFile.AppSettings.Settings;
                if (settings[key] == null)
                {
                    settings.Add(key, value);
                }
                else
                {
                    settings[key].Value = value;
                }
                configFile.Save(ConfigurationSaveMode.Modified);
                ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
            }
            catch (ConfigurationErrorsException)
            {
                Console.WriteLine("Error writing app settings");
            }
        }
    }
}

不删注释：

public static void SaveAppSettingsMethod2(string key, string value)
        {
            //验证key value
            //To Do

            XmlDocument xml = new XmlDocument();
　　　　　　string configPath = Application.ExecutablePath + ".config";
            xml.Load(configPath);

            XmlNodeList nodeList = xml.GetElementsByTagName("appSettings");

            if (nodeList != null)
            {
                if (nodeList.Count >= 1)
                {
                    XmlNode node = nodeList[0];
                    foreach (XmlNode item in node)
                    {
                        if (item.NodeType == XmlNodeType.Comment)
                        {
                            continue;
                        }

                        XmlAttribute xaKey = item.Attributes["key"];
                        XmlAttribute xaValue = item.Attributes["value"];


                        if (xaKey != null && xaValue != null && xaKey.Value.Equals(key))
                        {
                            xaValue.Value = value;
                        }
                    }
                }
            }
            xml.Save(configPath);
        }