KKK下拉框lookupedit绑定数据时，添加一条固定数据

var datasourcePDFfile = manager.SelectPDFFile(this.ID);
// 添加一条无章节选项
datasourcePDFfile.Insert(0, new LookupEditEntity() { KEY_ = new Guid(), VALUE_ = "无" });
// 赋值
this.luepdfnr.Properties.DataSource = datasourcePDFfile;