C# 生成txt日志文件

 /// <summary>
 /// 创建日志文件,每天一个
 /// </summary>
 /// <param name="logContent">日志内容 </param>
 public static void CreateInLog(string logContent)
 {
     string filePath = logurl.Trim();//路径：如 E:\
     filePath = filePath.EndsWith(@"\") ? filePath : (filePath + @"\");
     if (Directory.Exists(filePath) == false)
     {
         Directory.CreateDirectory(filePath);//判断该路径是否存在，不存在则创建该路径文件夹
     }

     DateTime dtNow = DateTime.Now;//获取当前日期
     string dateString = dtNow.Year.ToString();
     dateString += dtNow.Month.ToString().Length <  ? ("" + dtNow.Month.ToString()) : (dtNow.Month.ToString());
     dateString += dtNow.Day.ToString().Length <  ? ("" + dtNow.Day.ToString()) : (dtNow.Day.ToString());  //将日期格式转成yyyyMMdd的格式，如：20170921

     string filename = filePath + "Log_" + dateString + ".txt"; //创建文件名
     StreamWriter sw = null;

     if (File.Exists(filename))
     {
         sw = new StreamWriter(filename, true, System.Text.Encoding.GetEncoding("UTF-8"));
     }
     else
     {
         sw = new StreamWriter(filename, false, System.Text.Encoding.GetEncoding("UTF-8"));
     }

     StringBuilder dataRow = new StringBuilder("");
     dataRow.Append(logContent);
     sw.WriteLine(dataRow.ToString());//写入内容
     sw.Close();
 }