图片上传判断大小及宽高

1   HttpPostedFileBase file_IO = request.Files[key]; //key==0
2 
3   System.IO.BinaryReader reader = new System.IO.BinaryReader(file_IO.InputStream);
4  byte[] file_Bytes = reader.ReadBytes(file_IO.ContentLength);           
5  var length = file_Bytes.Length;
6 
7   System.Drawing.Image image = System.Drawing.Image.FromStream(file_IO.InputStream);
8   var width = image.Width;   //px
9   var height = image.Height;   //单位是 px