asp.net图片上传-简单实用（VS2008 FileUpload控件）

using System;using System.Collections;using System.Configuration;using System.Data;using System.IO;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;

namespace FileUpload{    public partial class _Default : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {

        }

        protected void btnFileUpload_Click(object sender, EventArgs e)        {            UploadPicFile(ImgFileUpload);        }

        internal readonly string AllowExt = "jpe|jpeg|jpg|png|tif|tiff|bmp|gif|wbmp|swf|psd";

        /// <summary>        /// 检测扩展名的有效性        /// </summary>        /// <param name="sExt">文件名扩展名</param>        /// <returns>如果扩展名有效,返回true,否则返回false.</returns>        bool CheckValidExt(string sExt)        {            bool flag = false;            string[] aExt = AllowExt.Split('|');            foreach (string filetype in aExt)            {                if (filetype.ToLower() == sExt.Replace(".", ""))                {                    flag = true;                    break;                }            }            return flag;        }        private void UploadPicFile(System.Web.UI.WebControls.FileUpload Fupload)        {            //文件上传函数            try            {                if (Fupload.HasFile)                {                    //判断文件格式                    string sExt = Fupload.FileName.Substring(Fupload.FileName.LastIndexOf(".")).ToLower();                    if (!CheckValidExt(sExt))                    {                        lblMsg.Text = "(原图片文件格式不正确！支持的格式有[ " + AllowExt + " ])";                        return;                    }                    //判断文件大小                    int intFileLength = Fupload.PostedFile.ContentLength;

                    if (intFileLength > 1000 * 1000)                    {                        this.lblMsg.Text = "文件大于1M，不能上传！";                        return;                    }

                    Random ran = new Random();

                    string UpDir = "/UpFiles/" + DateTime.Now.ToString("yyyyMM"); //上传目录                    if (!Directory.Exists(Server.MapPath(UpDir)))                    {                        Directory.CreateDirectory(Server.MapPath(UpDir));                        if (!Directory.Exists(Server.MapPath(UpDir)))                            return; //如果创建失败则返回                    }                        //上传文件重命名：时间+三位随机数                        string fileName = UpDir + "/" + DateTime.Now.ToString("yyyyMMddhhmmssfff") + Convert.ToString(ran.Next(100, 999));

                        fileName = fileName + sExt;

                        Fupload.PostedFile.SaveAs(HttpContext.Current.Server.MapPath(fileName));

                        lblMsg.Text = fileName + "上传成功！";                                    }                else                    lblMsg.Text = "请选择文件！";                return;

            }            catch            {                lblMsg.Text = "发生错误，请重新上传文件！";            }

        }    }}