[Resolvido] Obter tamanho imagem http

Você pode fazer dessa forma, através do objeto WebRequest:

string caminhoFoto = "http://www.idevweb.com.br/Content/images/idevweb.jpg";
 WebResponse result = null;
 Image rImage = null;

 WebRequest request = WebRequest.Create(caminhoFoto);
 var rBytes = new byte[] { };
 result = request.GetResponse();
 if (result != null)
 {
 Stream resStream = result.GetResponseStream();
 if(resStream != null)
 {
 using(var br = new BinaryReader(resStream))
 {
 rBytes = br.ReadBytes(1000000);
 br.Close();
 }
 }
 result.Close();
 using(var imageStream = new MemoryStream(rBytes, 0, rBytes.Length))
 {
 imageStream.Write(rBytes, 0, rBytes.Length);
 rImage = Image.FromStream(imageStream, true);
 imageStream.Close();
 }

 int with = rImage.Width;
 int height = rImage.Height;
 }

Desculpa só responder agora.

Obrigado.

Eu fiz desta forma

string urlImagem = "http://www.nomedosite.com/nomedaimagem.jpg";
HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(urlImagem);
HttpWebResponse httpWebReponse = (HttpWebResponse)httpWebRequest.GetResponse();
Stream stream = httpWebReponse.GetResponseStream();

Image objImage = Image.FromStream(stream);
MemoryStream ms = new MemoryStream();
objImage.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
Byte[] arr = ms.ToArray();

int width = objImage.Width;
int height = objImage.Height;