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 < 2 ? ("0" + dtNow.Month.ToString()) : (dtNow.Month.ToString());
    dateString += dtNow.Day.ToString().Length < 2 ? ("0" + 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();
}