c#验证照片

         
            if (Request.Files == null || Request.Files.Count == 0)
            {
                this.lblMsg.Text = msg2;
                this.lblMsg.ForeColor = Color.Red;
                return false;
            }
            HttpPostedFile file = Request.Files[0];
            //检查是否为空
            if (file == null || file.ContentLength == 0)
            {
                this.lblMsg.Text = msg2;
                this.lblMsg.ForeColor = Color.Red;
                return false;
            }

            //检查是否是图片
            if (file.ContentType.ToLower().IndexOf("image") < 0)
            {
                // Response.Redirect(Globals.AppendQuerystring(url, "msg", "2", false), true);

                this.lblMsg.Text = msg2;
                this.lblMsg.ForeColor = Color.Red;
                return false;

            }
            //检查是否是允许上传的类型bmp,jpg,png
            FileInfo info = new FileInfo(file.FileName);
            string supportedImgType = "^.png$|^.jpg$|^.bmp$";
            Regex reg = new Regex(supportedImgType, RegexOptions.Compiled);

            if (string.IsNullOrEmpty(info.Extension) || !reg.IsMatch(info.Extension.ToLower()))
            {
                string imgType = "";
                if (string.IsNullOrEmpty(info.Extension))
                    imgType = "未知";
                else
                    imgType = info.Extension;
                this.lblMsg.Text = string.Format(msg5, imgType);
                this.lblMsg.ForeColor = Color.Red;
                return false;
            }

            //检查是否超出大小
            if ((file.ContentLength / 1024) / 1024 > 5)
            {
                this.lblMsg.Text = msg6;
                this.lblMsg.ForeColor = Color.Red;
                return false;
                

            }