读书笔记：《Aspx开发200问》——在服务器端判断上传图片的高度和宽度

 

private void btnGet_Click(object sender, System.EventArgs e)
        {
            if(upImage.PostedFile.FileName != "")
            {
                imgPath =upImage.PostedFile.FileName;
                fileExtName = imgPath.Substring(imgPath.LastIndexOf(".")+1,3);

                if(fileExtName !="gif" && fileExtName != "jpg")
                {
                    Response.Write("请选择GIF和JPG格式的图片");
                }
                else
                {
                    System.Drawing.Image image =  System.Drawing.Image.FromFile(imgPath);
                    txtHeight.Text = image.Height.ToString();
                    txtWidth.Text = image.Width.ToString();
                }
            }
            else
            {
                Response.Write("请选择图片!");
            }
        }