ASP.NET网站文件上传下载功能

if (!IsPostBack)

{

if (Application["RaNum"] == null)

{

Random ra = new Random();

Application["RaNum"] = ra;

}

}

if (pictureUP.HasFile)

{

//Response.Write(FileUpload1.PostedFile.ContentLength);

if (pictureUP.PostedFile.ContentLength < 200 * 1024)

{

//string strPath = Server.MapPath("~/uploadfiles/");

//FileUpload1.SaveAs(strPath+FileUpload1.FileName);

string[] strs = pictureUP.FileName.Split(new char[] { '.' });

string strExt = strs[strs.Length - 1].ToLower();

ArrayList list = new ArrayList();

list.Add("jpg");

list.Add("gif");

list.Add("bmp");

if (list.Contains(strExt))

{

ArrayList listType = new ArrayList();

listType.Add("image/pjpeg");

// TextBox1.Text=pictureUP.PostedFile.ContentType;

listType.Add("image/gif");

listType.Add("image/bmp");

if (listType.Contains(pictureUP.PostedFile.ContentType))

{

Random ra = (Random)Application["RaNum"];

int strRa = ra.Next();

Int64 strDate = Convert.ToInt64(DateTime.Now.ToString("yyyyMMddhhmmss"));

string FileName = strDate.ToString("X") + strRa.ToString("X") + pictureUP.FileName;

string strPath = Server.MapPath("~/images/user/");

string strFilePath = strPath + FileName;

// TextBox1.Text = strFilePath;

while (File.Exists(strFilePath))

{

strRa = ra.Next();

strDate = Convert.ToInt64(DateTime.Now.ToString("yyyyMMddhhmmss"));

FileName = strDate.ToString("X") + strRa.ToString("X") + pictureUP.FileName;

strFilePath = strPath + FileName; }

try

{

pictureUP.SaveAs(strFilePath);

// Response.Write("上传成功！");

userInfoUpData U_Info = new userInfoUpData();

U_Info.UserID = userID.Text;

U_Info.UserPwd = userPWD.Text;

U_Info.UserName = userName.Text;

U_Info.UserSex = userSex.Text;

U_Info.UserAge = Convert.ToInt32(userAge.Text);

U_Info.UserTell = userTell.Text;

U_Info.UserAdr = userAdrr.Text;

U_Info.UserPic = FileName;

UserBLL U_Info_Bll = new UserBLL();

if (U_Info_Bll.UserInfoUp(U_Info) > 0)

{ Response.Write("<script>alert('修改成功')</script>");

}

else

{

Response.Write("<script>alert('修改失败')</script>");

}

}

catch

{

Response.Write("上传失败！");

}

}

}

else

{

Response.Write("<script>alert('上传的文件类型错误！')</script>");

}

}

else

{

Response.Write("<script>alert('上传文件的大小超过了200k!')</script>");

}

}

else

{

Response.Write("<script>alert('请选择一个上传的文件！')</script>");

} 我自己写的源代码你自己慢慢研究吧