输出日志信息到文本中

using System;
using System.Configuration;
namespace Common
{
    //配置Config文件信息
    public class Config
    {
        /// <summary>
        /// 数据库字符串
        /// </summary>
        public static string SQLConnString
        {
            get
            {
                return GetAppSettingToString("SQLDB");
            }
        }
        /// <summary>
        /// 是否启用调式日志
        /// </summary>
        public static bool IsDebugLog
        {
            get
            {
                return GetConfigBool("DebugLog");
            }
        }
        public static bool IsUploadByDate
        {
            get
            {
                return GetConfigBool("IsUploadByDate");
            }
        }

        /// <summary>
        /// 调试日志路径
        /// </summary>
        public static string LoggerPath
        {
            get
            {
                return GetAppSettingToString("LoggerPath");
                //return Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
            }
        }

        /// <summary>
        /// 获取AppSetting节点下的配置项
        /// </summary>
        /// <param name="name">节点名称</param>
        /// <param name="_default">默认值</param>
        /// <returns>对应节点的值</returns>
        public static string GetAppSettingToString(string name, string _default = "")
        {
            string sTmp = _default;
            try
            {
                sTmp = System.Configuration.ConfigurationManager.AppSettings[name] ?? _default;
            }
            catch
            {

                sTmp = _default;
            }
            return sTmp;
        }

        /// <summary>
        /// 修改AppSettings中配置
        /// </summary>
        /// <param name="key">key值</param>
        /// <param name="value">相应值</param>
        public static bool SetAppSettingValue(string key, string value)
        {
            try
            {
                Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                if (config.AppSettings.Settings[key] != null)
                {
                    config.AppSettings.Settings[key].Value = value;
                }
                else
                {
                    config.AppSettings.Settings.Add(key, value);
                }
                config.Save(ConfigurationSaveMode.Modified);
                ConfigurationManager.RefreshSection("appSettings");
                return true;
            }
            catch (Exception ex)
            {
                string message = string.Format("修改AppSettings异常：{0}", ex.ToString());
                CommonData.WriteErrorLog(message);
                return false;
            }
        }

        /// <summary>
        /// 得到AppSettings中的配置Bool信息
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static bool GetConfigBool(string key)
        {
            bool result = false;
            string cfgVal = GetAppSettingToString(key);
            if (null != cfgVal && string.Empty != cfgVal)
            {
                try
                {
                    result = bool.Parse(cfgVal);
                }
                catch (FormatException)
                {
                    // Ignore format exceptions.
                }
            }
            return result;
        }
        /// <summary>
        /// 得到AppSettings中的配置Decimal信息
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static decimal GetConfigDecimal(string key, decimal _default = 0)
        {
            decimal result = 0;
            string cfgVal = GetAppSettingToString(key);
            if (null != cfgVal && string.Empty != cfgVal)
            {
                try
                {
                    result = decimal.Parse(cfgVal);
                }
                catch (FormatException)
                {
                    result = _default;
                }
            }

            return result;
        }
        /// <summary>
        /// 得到AppSettings中的配置int信息
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static int GetConfigInt(string key, int _default = 0)
        {
            int result = 0;
            string cfgVal = GetAppSettingToString(key);
            if (null != cfgVal && string.Empty != cfgVal)
            {
                try
                {
                    result = int.Parse(cfgVal);
                }
                catch (FormatException)
                {
                    result = _default;
                }
            }

            return result;
        }

    }
}

/****************************************************************
 * 描述:文本日志操作
*****************************************************************/
using System;
using System.IO;
using System.Text;

namespace Common
{
    /// <summary>
    /// 文本日志
    /// </summary>
    public class TextLog
    {
        private static TextLog textLog;
        private string logFilePath;
        private TextLog()
        {
            this.logFilePath = this.GetLogPath();
        }

        public void WriteLog(LogLevel level, string information)
        {
            FileStream fs = null;

            object obj = new object();
            StringBuilder sb = new StringBuilder();

            lock (obj)
            {
                try
                {
                    this.logFilePath = this.GetLogPath();
                    using (fs = new FileStream(logFilePath, FileMode.Append))
                    {
                        sb.Append(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
                        switch (level)
                        {
                            case LogLevel.Info:
                            default:
                                sb.Append("   信息：");
                                break;
                            case LogLevel.Error:
                                sb.Append("   错误：");
                                break;
                            case LogLevel.Warring:
                                sb.Append("   警告：");
                                break;
                        }
                        sb.Append("
");
                        sb.Append(information);
                        sb.Append("
");

                        byte[] data = Encoding.Default.GetBytes(sb.ToString());
                        fs.Write(data, 0, data.Length);
                    }
                }
                catch { }
            }

        }

        private string GetLogPath()
        {
            //  string path = Directory.GetCurrentDirectory() ;
            DateTime date = DateTime.Now;
            string path = string.Format(@"{0}{1}{2}.log", Config.LoggerPath, date.ToString("yyyy-MM"), date.Day.ToString());
            if (!Directory.Exists(Path.GetDirectoryName(path)))
            {
                Directory.CreateDirectory(Path.GetDirectoryName(path));
            }
            return path;
        }
        public static TextLog GetInstance()
        {
            object obj = new object();
            if (textLog == null)
            {
                lock (obj)
                {
                    try
                    {
                        textLog = new TextLog();
                    }
                    catch { }
                }
            }
            return textLog;

            //textLog = new TextLog();
            //return textLog; 
        }
    }

    public enum LogLevel
    {
        /// <summary>
        /// 信息
        /// </summary>
        Info = 1,
        /// <summary>
        /// 错误
        /// </summary>
        Error = 2,
        /// <summary>
        /// 警告
        /// </summary>
        Warring = 3

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Common
{
    public class CommonData
    {
        #region 写入日志操作
        /// <summary>
        /// 写入信息日志
        /// </summary>
        /// <param name="msg"></param>
        public static void WriteInfoLog(string msg)
        {
            TextLog.GetInstance().WriteLog(LogLevel.Info, msg);
        }
        /// <summary>
        /// 写入错误日志
        /// </summary>
        /// <param name="msg"></param>
        public static void WriteErrorLog(string msg)
        {
            TextLog.GetInstance().WriteLog(LogLevel.Error, msg);
        }
        /// <summary>
        /// 写入警告日志
        /// </summary>
        /// <param name="msg"></param>
        public static void WriteWwarringLog(string msg)
        {
            TextLog.GetInstance().WriteLog(LogLevel.Warring, msg);
        }
        /// <summary>
        /// 根据配置写入调试日志
        /// </summary>
        /// <param name="msg"></param>
        public static void WriteDebugLog(string msg)
        {
            if (Config.IsDebugLog)
            {
                TextLog.GetInstance().WriteLog(LogLevel.Info,string.Format("调式日志：{0}",msg));
            }
        }
        #endregion
    }
}