byte[] getImageByte = HttpHelper.getImageByte(HttpContext.Current.Server.MapPath(("~/UploadFiles/StuImgs/" + result_Model.StuImage)));

if (getImageByte != null)

{

student.StuImage = result_Model.StuImage;

student.pic_data = Convert.ToBase64String(getImageByte);

}

else

{

student.StuImage = "";//图片找不到

}