客户端获得图片文件大小。

<SCRIPT LANGUAGE="JavaScript">
<!--
 function getPicSize()
 {
var pic ="http://image.chinahr.com/2005/sss/images/top.jpg";
 var imgs = new Image();
 imgs.src = pic;
 alert(imgs.fileSize);//9062
 alert(imgs.width);
 alert(imgs.height);
 }

 setTimeout("getPicSize()",5000);
//-->
</SCRIPT>

服务器端的:
System.Drawing.Image myImage = System.Drawing.Image.FromFile(图片路径);
string strWidth = myImage.Width;
string strHeight = myImage.Height;