App_Code/Common.cs

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using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

namespace TravelWeb
{
    public class Common
    {/// <summary>
        /// 文件上传
        /// </summary>
        /// <param name="fileupload">文件上传实例</param>
        /// <returns>保存的文件名称</returns>
        public static string UpLoadFile(FileUpload fileupload, string Folders)
        {
            string fullname = fileupload.PostedFile.FileName;
            if ((fullname == null) || (fullname.Equals("")))
                return "";
            string huozui = fullname.Substring(fullname.LastIndexOf("."));
            string filename = GetFileName();
            string p1 = Folders + filename + huozui;
            string path = HttpContext.Current.Server.MapPath(p1);

            if (System.IO.File.Exists(path))
                System.IO.File.Delete(path);
            fileupload.PostedFile.SaveAs(path);
            return p1;
        }
        /// <summary>
        /// 生成文件名称
        /// </summary>
        /// <returns>文件名称</returns>
        public static string GetFileName()
        {
            System.Threading.Thread.Sleep(1000);
            string fileName = System.DateTime.Now.ToString("yyyy-MM-dd-hh-mm-ss-fff");
            return fileName;
        }

        public static bool IsVirtualDir()
        {
            string appPath = HttpContext.Current.Request.ApplicationPath;
            if (appPath.Equals("/"))
                return false;
            else
                return true;
        }

    }
}