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;

namespace CommonLib
{
    public class FileHelper
    {
        /// <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</param>
        /// <param name="allowedExtensions">允许上传文件的格式</param>
        /// <param name="stroldPath">是否指定文件路径(目录路径+文件的真实名称)</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, bool blDatePath, string stroldPath)
        {
            string uploadedPath = "";
            bool fileOk = false;
            string filePath = HttpContext.Current.Server.MapPath(strPath);
            string fileExtension = System.IO.Path.GetExtension(fileUpload.FileName).ToLower();

            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)
                    {
                        if (stroldPath == "")
                        {
                            if (blDatePath)
                            {
                                string dateFileName = GetDateTimeFileName();
                                fileUpload.PostedFile.SaveAs(filePath + dateFileName + fileExtension);
                                uploadedPath = strPath + dateFileName + fileExtension;
                            }
                            else
                            {
                                fileUpload.PostedFile.SaveAs(filePath + fileUpload.FileName);
                                uploadedPath = strPath + fileUpload.FileName;
                            }
                        }
                        else
                        {