为每个用户创建文件夹，并实现图片上传

/// <summary>
/// 用户登录即为每个用户创建文件夹,userid从session获取,即登录用户ID
/// </summary>
protected void CreateFlord()
{
path = "../../uploads/Picture/" + userid;
imgpath = Server.MapPath(path).ToString();
if (!Directory.Exists(imgpath))
{
Directory.CreateDirectory(imgpath);
}
}

if (!this.fuImg.HasFile)
{
this.PicPrompt.InnerHtml = "图片路径不能为空";
return;
}
Random rd = new Random();
filename = DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() +DateTime.Now.Millisecond.ToString() + rd.Next(100000, 999999).ToString();//当前时间+随机数以重命名图片名字
typefilename = System.IO.Path.GetExtension(this.fuImg.FileName).ToLower();
if (typefilename != ".jpg" & typefilename != ".gif" & typefilename != ".png")
{
this.PicPrompt.InnerHtml = "图片只能为jpg、gif、png格式";
return;
}
this.PicPrompt.InnerHtml = "";
this.fuImg.SaveAs(imgpath + "\\" + filename + typefilename);
SDW.Model.Picture model_picture = new SDW.Model.Picture();
model_picture.PicName = filename;
model_picture.PicUrl = path + "/" + filename + typefilename;
model_picture.PicText = this.txtPicText.Text;
model_picture.Createdate = DateTime.Now;
model_picture.Album = Convert.ToInt32(this.ddlAlbum.SelectedItem.Value);
model_picture.PicUser = userid;
AddPicture(model_picture);//将图片信息保存到数据库