图片尺寸

  protected void btnUpload_Click(object sender, EventArgs e)
        {
            int width = 0, height = 0;
            if (fileUpload.HasFile)
            {
                string dict = "/Content/Files/" + DateTime.Now.ToShortDateString() + "/";
                string serverPath = Server.MapPath(dict);
                if (!System.IO.File.Exists(serverPath))
                {
                    System.IO.Directory.CreateDirectory(serverPath);
                    string filePath = serverPath + fileUpload.FileName;
                    fileUpload.SaveAs(filePath);
                    getImageSize(filePath, out width, out height);
                    if (width >= 400 || height >= 400)
                    {
                        literFile.Text = "上传文件尺寸必须是：400*400";
                        System.IO.File.Delete(filePath);
                    }
                    else
                    {
                        literFile.Text = width + ":" + height;
                    }
                }
            }
            else
            {
                Response.Write("没有上传文件");
            }
        }

        private void getImageSize(string filePath, out int iWidth, out int iHeight)
        {
            iWidth = iHeight = 0;
          //FileStream
            System.Drawing.Image imgFile = System.Drawing.Image.FromFile(filePath);
            if (imgFile != null)
            {
                iWidth = imgFile.Width;
                iHeight = imgFile.Height;
            }
            imgFile.Dispose();
        }