App_Code/FileHelper.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Web.UI.WebControls;
using System.Web;
using System.Web.UI.HtmlControls;
using System.Web.UI;
using System.Collections;

namespace CommonLib
{
    public class FileHelper
    {
        #region 上传文件并返回文件所在服务器的相对路径(目录路径+文件的真实名称)
        /// <summary>
        /// 上传文件并返回文件所在服务器的相对路径(目录路径+文件的真实名称)
        /// </summary>
        /// <param name="fileUpload">FileUpload服务器控件</param>
        /// <param name="strPath">文件存放目录</param>
        /// <param name="fileSize">允许上传文件的大小，如userfiles/pro/或../userfiles/pro/</param>
        /// <param name="allowedExtensions">允许上传文件的格式</param>
        /// <param name="mypage">调用方法页面</param>
        /// <returns>返回文件路径(目录路径+文件的真实名称)</returns>
        public static string UploadFile(FileUpload fileUpload, string strPath, int fileSize, string[] allowedExtensions, Page mypage)
        {
            string uploadedPath = "";
            bool fileOk = false;
            string filePath = HttpContext.Current.Server.MapPath(strPath);
            string fileExtension = System.IO.Path.GetExtension(fileUpload.FileName).ToLower();

            //判断文件后缀名
            if (fileUpload.HasFile)
            {
                for (int i = 0; i < allowedExtensions.Length; i++)
                {
                    if (fileExtension == allowedExtensions[i].ToLower())
                    {
                        fileOk = true;
                    }
                }
            }

            if (fileOk)
            {
                try
                {
                    if (fileUpload.PostedFile.ContentLength < fileSize * 1024)
                    {
                        string filename = Guid.NewGuid().ToString("N");
                        fileUpload.PostedFile.SaveAs(filePath + filename + fileExtension);
                        uploadedPath = strPath + filename + fileExtension;
                    }
                    else
                    {
                        uploadedPath = "";
                        Alert("提示:文件的大小超出规定的大小!", mypage);
                    }
                }
                catch