FileUpload控件的一个实例

 

 #region fileUpload
    /// <summary>
    /// 按规定上传图片
    /// </summary>
    /// <param name="fu">FileUpload</param>
    /// <param name="fs">图片大小 Unit:K 不限制为-1</param>
    /// <param name="w">图片宽度.不限制为-1</param>
    /// <param name="h">图片高度.不限制为-1</param>
    /// <param name="lbl">把文件信息显示到Label标签，不显示设置为null</param>
    /// <param name="img">把文件信息显示到Image标签，不显示设置为null</param>
    private void ImgFileUpload(FileUpload fu,int fs,int w,int h,Label lbl,Image img)
    {
       if(fu.HasFile)
       {
           #region 判断大小
           
           string strErr = "";//错误信息
            if(fu.PostedFile==null)
            {
                strErr += "对不起，上传文件不能为空！\\n";
            }
            int filesize = fu.PostedFile.ContentLength;
            if (filesize < 1)
            {
                strErr += "对不起，上传文件不能为空！\\n";
            }
            if (fs == -1)
            {
                ///不限制大小
            }
            else
            {
                if (filesize > fs*1024) ///byte
                {
                    strErr += "对不起，文件大小不能大于" + fs + "K！\\n";
                } 
            }
            strErr = strErr.Trim();
            if (strErr != "")
            {
                MessageBox.Show(this, strErr);
                return;
            }
           #endregion
            #region 获得文件信息
            string filename;
            string filetype;
            string savename;
            
            filetype = fu.PostedFile.ContentType.ToString();
            filename = fu.FileName;
            savename = "T_"+System.DateTime.Now.ToString("yyMMddHHmmss") + "_" + filename;
            int w1=0;
            int h1=0;
            strErr = "";
            #endregion
            #region 判断格式，宽高
            switch (filetype)
            {
                case "image/gif":
                case "image/bmp":
                case "image/pjpeg": //图片格式
                    {
                        System.IO.Stream s = fu.PostedFile.InputStream;
                        System.Drawing.Image i = System.Drawing.Image.FromStream(s);
                        w1 = i.Width;
                        h1 = i.Height;
                        ///判断宽度和高度
                        if (w != -1)        //进行宽度限制
                        {
                            if (w1 > w)
                            {
                                strErr += "对不起，该文件格式超过规定"+w+"px的宽度！\\n";                                    
                            }
                        }

                        if (h != -1)        //进行宽度限制
                        {
                            if (h1 > h)
                            {
                                strErr += "对不起，该文件格式超过规定"+h+"px的高度！\\n";
                            }
                        }
                        break;
                    }
                   
                //case "application/x-shockwave-flash":
                //case "application/octet-stream":
                //    break;
                //case "video/x-ms-wmv":
                //case "video/mpeg":
                //case "video/x-ms-asf":
                //case "video/avi":
                //case "audio/mpeg":
                //case "audio/mid":
                //case "audio/wav":
                //case "audio/x-ms-wma":
                //    break;
                //case "application/vnd.rn-realmedia-vbr":
                //    break;
                default:
                    strErr += "对不起，不允许该文件格式上传！\\n";
                    break;
            }
            if (strErr != "")
            {
                MessageBox.Show(this, strErr);
                return;
            }
            #endregion 

            string strInfo = "";

            strInfo += "文件名：" + filename + "<br>";
            strInfo += "文件大小：" + filesize + "<br>";
            strInfo += "文件类型：" + filetype + "<br>";
            strInfo += "文件高度：" + h1 + "<br>";
            strInfo += "文件宽度：" + w1 + "<br>";
            
            //string imgpath = "UpPic" + "\\" + savename; ///图片路径
            string imgpath = "../UploadImages/" +  savename; ///图片路径
            string fullpath = Server.MapPath("../UploadImages") + "\\" + savename;
            fu.SaveAs(fullpath);

            if (lbl != null)
            {
                lbl.Text = strInfo;
                lbl.Visible = true;
            }
            if (img != null)
            {
                img.ImageUrl = imgpath;
                img.Visible = true;
            }
        }
    }
    #endregion