富文本二进制转换成string

 var explainString = Encoding.Unicode.GetString(list[].KindExplain);
                if (explainString.IndexOf("\u003cimg") > -)
                {
                    explainString =
                        explainString.Substring(, explainString.IndexOf("\u003cimg") + ) + "  src=\"" + Request.Url.Host + ":" + Request.Url.Port +explainString.Substring(explainString.IndexOf("src=") + , explainString.IndexOf("\"", explainString.IndexOf("src=") + ) +  - (explainString.IndexOf("src=") + )) + " " + explainString.Substring(explainString.IndexOf("/\u003e", explainString.IndexOf("\u003cimg") + ), explainString.Length - explainString.IndexOf("/\u003e", explainString.IndexOf("\u003cimg") + ));
                }
                return Json(explainString, JsonRequestBehavior.AllowGet);

若是有图片，填上ip地址和端口号