C# 写日志帮助类

写日志帮助类，共有三个静态方法。

1.创建错误日志，写文本文件。

2.创建错误日志，写入MSSQL数据库。

2.创建登陆日志，写入MSSQL数据库。

using System;
using System.Text;
using System.IO;
using System.Data;
using System.Data.SqlClient;

namespace myClass
{
    public class clsLogHelper
    {

        #region  创建错误日志
        ///-----------------------------------------------------------------------------
        /// <summary>创建错误日志 在c:\ErrorLog\</summary>
        /// <param name="strFunctionName">strFunctionName,调用方法名</param>
        /// <param name="strErrorNum">strErrorNum,错误号</param>
        /// <param name="strErrorDescription">strErrorDescription,错误内容</param>
        /// <returns></returns>
        /// <history>2009-05-29 Created</history>
        ///-----------------------------------------------------------------------------
        //举例:
        //         try
        //         {    要监视的代码     }
        //      catch()
        //            {  myErrorLog.m_CreateErrorLogTxt("myExecute(" & str执行SQL语句 & ")", Err.Number.ToString, Err.Description)  }     
        //         finally
        //         {            }
        public static void m_CreateErrorLogTxt(string strFunctionName, string strErrorNum, string strErrorDescription)
        {
            string strMatter; //错误内容
            string strPath; //错误文件的路径
            DateTime dt = DateTime.Now;
            try
            {
                //Server.MapPath("./") + "File"; 服务器端路径
                strPath = Directory.GetCurrentDirectory() + "\\ErrorLog";   //winform工程\bin\目录下 创建日志文件夹 
                //strPath = "c:" + "\\ErrorLog";//暂时放在c:下

                if(Directory.Exists(strPath)==false)  //工程目录下 Log目录 '目录是否存在,为true则没有此目录
                {
                    Directory.CreateDirectory(strPath); //建立目录　Directory为目录对象
                }    
                strPath = strPath + "\\" + dt.ToString("yyyyMM");

                if(Directory.Exists(strPath) == false)  //目录是否存在  '工程目录下 Log\月 目录   yyyymm
                {
                    Directory.CreateDirectory(strPath);  //建立目录//日志文件，以 日 命名 
                }
                strPath = strPath + "\\" + dt.ToString("dd") + ".txt"; 

                strMatter = strFunctionName + " , " + strErrorNum + " , " + strErrorDescription;//生成错误信息
                
                StreamWriter FileWriter= new StreamWriter(strPath, true); //创建日志文件
                FileWriter.WriteLine("Time: " + dt.ToString("HH:mm:ss") + "  Err: " + strMatter); 
                FileWriter.Close(); //关闭StreamWriter对象
            }
            catch(Exception ex)
            {
                //("写错误日志时出现问题，请与管理员联系！ 原错误:" + strMatter + "写日志错误:" + ex.Message.ToString());
                string str=ex.Message.ToString();
            }
        }
        #endregion

        #region  创建错误日志
        ///-----------------------------------------------------------------------------
        /// <summary>创建错误日志 在 数据库 sys_ErrorLog 表中</summary>
        /// <param name="strFunctionName">strFunctionName,调用方法名</param>
        /// <param name="strErrorNum">strErrorNum,错误号</param>
        /// <param name="strErrorDescription">strErrorDescription,错误内容</param>
        /// <returns></returns>
        /// <history>2009-09-08 Created</history>
        ///-----------------------------------------------------------------------------
        //举例:
        //         try
        //         {    要监视的代码     }
        //      catch()
        //            {  myErrorLog.m_CreateErrorLogSql("myExecute(" & str执行SQL语句 & ")", Err.Number.ToString, Err.Description)  }     
        //         finally
        //         {            }
        //重载--默认连接字符串
        public static void m_CreateErrorLogSql(string strFunctionName, string strErrorNum, string strErrorDescription)
        {
            m_CreateErrorLogSql(clsPubConstant.p_ConnectionString, strFunctionName, strErrorNum, strErrorDescription);
        }
        public static void m_CreateErrorLogSql(string strConnectionString, string strFunctionName, string strErrorNum, string strErrorDescription)
        {
            try
            {
                DbHelperSQL.connectionString = strConnectionString;//连接字符串
                if (strFunctionName.Length >= 90)//控件字符串长度
                {
                    strFunctionName = strFunctionName.Remove(90);
                }
                if (strErrorNum.Length >= 90)
                {
                    strErrorNum = strErrorNum.Remove(90);
                }
                if (strErrorDescription.Length >= 190)
                {
                    strErrorDescription = strErrorDescription.Remove(190);
                }

                StringBuilder strSql = new StringBuilder();
                strSql.Append("insert into sys_ErrorLog(");
                strSql.Append("DateTime,FunctionName,ErrorNum,ErrorDescription)");
                strSql.Append(" values (");
                strSql.Append("@DateTime,@FunctionName,@ErrorNum,@ErrorDescription)");
                SqlParameter[] parameters = {
                    new SqlParameter("@DateTime", SqlDbType.NVarChar),
                    new SqlParameter("@FunctionName", SqlDbType.NVarChar),
                    new SqlParameter("@ErrorNum", SqlDbType.NVarChar),
                    new SqlParameter("@ErrorDescription", SqlDbType.NVarChar)};
                parameters[0].Value = System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");//当前日间
                parameters[1].Value = strFunctionName;
                parameters[2].Value = strErrorNum;
                parameters[3].Value = strErrorDescription;

                DbHelperSQL.ExecuteSql(strSql.ToString(), parameters);//执行
            }
            catch
            { 

            }
        }
        #endregion

        #region  创建登陆日志
        ///-----------------------------------------------------------------------------
        /// <summary>创建登陆日志 在 数据库 sys_LoginLog 表中</summary>
        /// <param name="strLoginDate">登陆时间</param>
        /// <param name="strLoginName">登陆用户名</param>
        /// <param name="strLoginStatus">登陆情况</param>
        /// <param name="strEmployeeNo">员工编号</param>
        /// <param name="strRemark">备注</param>
        /// <returns></returns>
        /// <history>2010-01-31 Created</history>
        ///-----------------------------------------------------------------------------
        //举例:
        //     clsLogHelper.m_CreateLoginLogSql("2010-01-31 12:12:00", "admin", "登陆成功","1001","备注-预留字段")  }     
        //重载--默认连接字符串
        public static void m_CreateLoginLogSql(string strLoginName, string strLoginStatus, string strEmployeeNo, string strRemark)
        {
            m_CreateLoginLogSql(clsPubConstant.p_ConnectionString, strLoginName, strLoginStatus, strEmployeeNo, strRemark);
        }
        public static void m_CreateLoginLogSql(string strConnectionString,string strLoginName, string strLoginStatus, string strEmployeeNo, string strRemark)
        {
            try
            {
                DbHelperSQL.connectionString = strConnectionString;//连接字符串

                StringBuilder strSql = new StringBuilder();
                strSql.Append("insert into sys_LoginLog(");
                strSql.Append("LoginDate,LoginName,LoginStatus,EmployeeNo,Remark)");
                strSql.Append(" values (");
                strSql.Append("@LoginDate,@LoginName,@LoginStatus,@EmployeeNo,@Remark)");
                SqlParameter[] parameters = {
                    new SqlParameter("@LoginDate", SqlDbType.NVarChar),
                    new SqlParameter("@LoginName", SqlDbType.NVarChar),
                    new SqlParameter("@LoginStatus", SqlDbType.NVarChar),
                    new SqlParameter("@EmployeeNo", SqlDbType.NVarChar),
                    new SqlParameter("@Remark", SqlDbType.NVarChar)};
                parameters[0].Value = System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");//当前日间
                parameters[1].Value = strLoginName;
                parameters[2].Value = strLoginStatus;
                parameters[3].Value = strEmployeeNo;
                parameters[4].Value = strRemark;

                DbHelperSQL.ExecuteSql(strSql.ToString(), parameters);//执行
            }
            catch(System.Exception ex)
            {
                m_CreateErrorLogSql(strConnectionString, "m_CreateLoginLogSql( " + strLoginName + "," + strLoginStatus +"," + strEmployeeNo + "," + strRemark + ")", "", ex.Message.ToString());
            }
        }
        #endregion
    }
}