<asp:Image ID="VideoImg" runat="server" Width="269" Height="152" ResizeWidth="269"/>
videoImg.ImageUrl = SitecoreHelper.GetMediaUrlforImageField(curItem.Fields["Image Info"]) + "?w=" + videoImg.Attributes["ResizeWidth"];
 public static string GetMediaUrlforImageField(Sitecore.Data.Fields.ImageField field)
        {
            if (field != null && field.MediaItem != null)
            {
                MediaItem media = new MediaItem(field.MediaItem);
                return MediaManager.GetMediaUrl(media);
            }
            return "";
        }
 public static string GetMediaId(Sitecore.Data.Fields.ImageField field)
        {
            if (field != null && field.MediaItem != null)
            {
                MediaItem media = new MediaItem(field.MediaItem);
                string mediaId = media.ID.ToString();
                return mediaId;
            }
            return "";
        }
原文:http://www.cnblogs.com/wokao100000/p/4216432.html