记录游客页面访问IP の 简易实现 (asp.net for notepad)

using System;
using System.IO;

/// <summary>
/// File
/// </summary>
public class File
{
    protected string FilePath;

    /// <summary>
    /// File构造
    /// </summary>
    /// <param name="filePath">需要操作的文本路径</param>
    public File(string filePath)
    {
        this.FilePath = filePath;
    }

    /// <summary>
    /// 文本内容写入
    /// </summary>
    /// <param name="info">写入内容</param>
    public void FileWrite(string info)
    {
        try
        {
            FileInfo file = new FileInfo(FilePath);

            if (!file.Exists)
            {
                using (StreamWriter sw = file.CreateText())
                {
                    sw.WriteLine(info);
                }
            }
            else
            {
                using (StreamWriter sw = file.AppendText())
                {
                    sw.WriteLine(info);
                }
            }            
        }
        catch(FileNotFoundException fileCe)
        {
            throw fileCe;
        }
        catch (Exception ce)
        {
            throw ce;
        }        
    }
}

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //判断当前用户是否访问过，只记录未访问过的用户
            if (Request.Cookies["IsExitsIP"] == null)
            {
                //每天一个记事本.txt
                string fileName = string.Format("{0}{1}{2}", DateTime.Now.Year.ToString(), DateTime.Now.Month.ToString(), DateTime.Now.Day.ToString());
                File file = new File(Server.MapPath("~/test/" + fileName + ".txt"));
                file.FileWrite(Request.UserHostName);

                //给正在访问的用户添加已访问标记
                HttpCookie cokie = new HttpCookie("IsExitsIP");
                cokie.Values.Add("ip", Request.UserHostName);
                Response.AppendCookie(cokie);
            }
        }
    }
}