[MVC]如何删除文章内容中的图片

if (!string.IsNullOrWhiteSpace(entity.Content))
                {
                    var immgList = TextHelper.GetImgUrlList(entity.Content);  
                    var mainUrl = (Request.Url.ToString()).Replace(Request.RawUrl, ""); 
                    foreach (var item in immgList)
                    {
                        var filepath = item.Replace(mainUrl, "~"); 
                        FileHelper.DeleteFiles(filepath);
                    }
                }