.NET获得上传图片宽高

代码：

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//图片大小限制---------------------------                     System.Drawing.Image txtStoryimage = System.Drawing.Image.FromStream(txtStoryImg.PostedFile.InputStream);                     if (txtStoryimage.Width > 360 * (1 + ConfigHelper.PicRandValue) || txtStoryimage.Width < 360 * (1 - ConfigHelper.PicRandValue))                     {                         Alert.ShowInParent("图片高度应该在" + 360 * (1 - ConfigHelper.PicRandValue) + "-" + 360 * (1 + ConfigHelper.PicRandValue) + "象素之间！");                         return;                       }                     if (txtStoryimage.Height > 452 * (1 + ConfigHelper.PicRandValue) || txtStoryimage.Height < 452 * (1 - ConfigHelper.PicRandValue))                     {                         Alert.ShowInParent("图片高度应该在" + 452 * (1 - ConfigHelper.PicRandValue) + "-" + 452 * (1 + ConfigHelper.PicRandValue) + "象素之间！");                         return;                     }