ASP.NET获取上传图片的大小

<input id="FileUpload" type="file" size="30" name="FileUpload" onpropertychange="javascript：img2.src=this.value;">

<img id="img2" src="" style="visibility:hidden;position:absolute;top=-10000"/> 

<input type="button" value="获取" onclick="javascript：abc();"> 

<script type="text/javascript">

        function abc() {

            alert(img2.width);

        }

    </script>

2.采用流取得图片大小　 

Stream stream=file.PostedFile.InputStream; 

System.Drawing.Image image=System.Drawing.Image.FromStream(stream);

int picWidth= image.Width;

int picheight= image.Height;

3.使用文件得到图片大小 

System.Drawing.Image image=System.Drawing.Image.FromFile（物理路径）

 int picWidth= image.Width;

int picheight = image.Height;