C# Directory FileStream StreamWriter

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace WebApplication1.Controllers
{
public class HomeController : Controller
{
public ActionResult Index()
{
string message = string.Empty;

string folderPath1 = System.AppDomain.CurrentDomain.BaseDirectory + "\\log";
string folderPath2 = System.IO.Directory.GetCurrentDirectory() + "\\log";
string folderPath3 = System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName + "\\log";
string folderPath4 = System.Environment.CurrentDirectory + "\\log";
string folderPath5 = Server.MapPath("\\log");

string fileName = "\\" + DateTime.Now.ToShortDateString() + ".log";
string filePath = folderPath1 + fileName;
try
{
///检查“文件夹”是否存在
if (!System.IO.Directory.Exists(folderPath1))
{
Directory.CreateDirectory(folderPath1);
//Directory.Delete("");
//Directory.Move("原地址", "新地址");
}
///检查“文件”是否存在
if (!System.IO.File.Exists(filePath))
{
FileStream fs = new FileStream(filePath, FileMode.Create);
StreamWriter sw = new StreamWriter(fs);
sw.WriteLine(DateTime.Now.ToString() + " " + message + "\t");
sw.Close();
fs.Close();
}
else
{
#region  方式一
///FileMode.Append            若存在文件，则打开该文件并查找到文件尾，或者创建一个新文件
///FileMode.Create              指定操作系统应创建新文件
///FileMode.CreateNew       指定操作系统应创建新文件
///FileMode.Open                指定操作系统应打开现有文件
///FileMode.OpenOrCreate  （如果文件存在）；否则，应创建新文件
///FileMode.Truncate
FileStream fs = new FileStream(filePath, FileMode.Append);
//FileStream fs = new FileStream(filePath, FileMode.Append, FileAccess.Write);
StreamWriter sw1 = new StreamWriter(fs);
sw1.WriteLine(DateTime.Now.ToString() + " " + message);
sw1.Close();
fs.Close();
#endregion

#region 方式二
///设置成true会连续写内容
///设置成false会覆盖原有内容
StreamWriter sw = new StreamWriter(filePath, true);
sw.WriteLine(DateTime.Now.ToString() + " " + message);
sw.Close();
#endregion
}
}
catch (Exception)
{
}
return View();
}

public ActionResult Stock()
{
//byte[] bts;
//#region
//#endregion 接收流文件
//Image img = new Bitmap("https://***.***.com/I2AdminNew/GetBackgroundImageHandler.ashx");
//MemoryStream ms = new MemoryStream();
//img.Save(ms, ImageFormat.Bmp);
//bts = ms.ToArray();
//ms.Close();

//#region 流文件转换为图片
//MemoryStream ms1 = new MemoryStream(bts);
////Bitmap img1 = new Bitmap(ms1);
//Image img1 = Image.FromStream(ms1);
//ms1.Close();
//#endregion

return View();
}
}
}