上传图片文件

此处上传文件，使用FileUpload控件。

图片上传 ：<asp:FileUpload ID="FileUpload1" runat="server" onchange="PreviewImg(this)" /> <asp:HiddenField ID="hildimage" runat="server" />

下面是代码：

    public void upload_Click()
    {
        try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                  check.showMess(this, "图片不能为空！");
            }
            else
            {
                string fullname = FileUpload1.FileName.Replace(",", " ").Trim();
                string typ2 = fullname.Substring(fullname.LastIndexOf(".") + 1).ToLower().ToString();
                string fn = DateTime.Now.ToString("yyyyMMddHHmmss") + "." + typ2;
                if (typ2 == "gif" || typ2 == "jpg" || typ2 == "bmp" || typ2 == "png")
                {
                    string img = hildimage.Value;
                    if (img != "")
                    {
                        string imgpath = Server.MapPath("../" + img);
                        File.Delete(imgpath);
                    }
                    FileUpload1.SaveAs(Server.MapPath("../upload/") + fn);           //将文件保存在根目录的UP文件夹下  
                    hildimage.Value = "upload/" + fn;
                }
                else
                {
                    check.Show_ErrorMsg("文件类型不支持!");
                    Response.End();
                }
            }
        }
        catch (Exception ex)
        {
            check.Show_ErrorMsg("上传发生错误！原因是：" + ex.ToString());
            Response.End();
        }
    }