SocketStudy/SocketStudy/PUtil/AppSetting.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PUtility
{
	public class AppSetting
	{
		public static AppSetting Default { get; set; } = new AppSetting();

		public string ConfigFileName { get; private set; }
		private Configuration configuration;
		public Configuration Config
		{
			get
			{
				if (configuration == null)
				{
					if (string.IsNullOrEmpty(ConfigFileName))
					{
						configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
					}
					else
					{
						ExeConfigurationFileMap configMap = new ExeConfigurationFileMap();
						configMap.ExeConfigFilename = this.ConfigFileName;
						configuration = ConfigurationManager.OpenMappedExeConfiguration(configMap, ConfigurationUserLevel.None);
					}
				}

				return configuration;
			}
		}

		public AppSetting(string fileName = null)
		{
			InitInstance(fileName);
		}

		private void InitInstance(string fileName)
		{
			this.ConfigFileName = fileName;
		}

		public void Refresh()
		{
			configuration = null;
		}

		public T GetValue<T>(string key, T defaultValue)
		{
			if (this.Config.AppSettings.Settings[key] == null)
				return defaultValue;

			string source = this.Config.AppSettings.Settings[key].Value;

			TypeConverter converter = TypeDescriptor.GetConverter(typeof(T));
			try
			{
				return (T)converter.ConvertFromString(source);
			}
			catch (Exception ex)
			{
				PFileManager.Instance.WriteLog($"AppSetting.GetValue Exception: {ex.Message}");
				return defaultValue;
			}
		}

		public void SetValue<T>(string key, T value)
		{
			Refresh();

			TypeConverter converter = TypeDescriptor.GetConverter(typeof(T));
			string valueString = converter.ConvertToString(value);

			if (this.Config.AppSettings.Settings[key] == null)
				this.Config.AppSettings.Settings.Add(key, valueString);
			else
				this.Config.AppSettings.Settings[key].Value = valueString;

			this.Config.Save();

			if (string.IsNullOrEmpty(ConfigFileName))
				ConfigurationManager.RefreshSection("appSettings");
		}
	}
}