#region 获取替代料信息
            if (type == "QueryMaterialMessage")
            {
                string SearchMaterial = context.Request.QueryString["SearchMaterial"].Trim();
                DataTable dt = new DataTable();

                if (String.IsNullOrEmpty(SearchMaterial))
                {
                    dt = new BMaterialMessage().GetMaterialMessageByModel(new MMaterialMessage());
                }
                else
                {
                    dt = new BMaterialMessage().GetVagueSubstituteMaterial(SearchMaterial);
                }

                if (dt.Rows.Count > 0)
                {
                    JsonStr = JsonConvert.SerializeObject(dt);
                }
            }
            #endregion