Class: MxPropertiesWindowCustom ​

// 属性界面上，得到对象属性事件。
   MxCpp.PropertiesWindow.onEvent_getProperties((id: McObjectId) => {
       let ent = id.getMcDbEntity();
       if (!ent) return [];
       let dn = ent.getxDataDouble("DN");
       let len = ent.getxDataDouble("LEN");
       let ret = [];

       if (dn.ret) {
           ret.push({
               sVarName: "DN",
               iVarType: MxPropertiesWindowCustomValueType.kDouble,
               val: dn.val,
               isOnlyRead: false
           });
       }

       if (len.ret) {
           ret.push({
               sVarName: "LEN",
               iVarType: MxPropertiesWindowCustomValueType.kDouble,
               val: len.val,
               isOnlyRead: false
           });
       }
       return ret;
   })

// 属性界面上，对象属性被修改事件。
   MxCpp.PropertiesWindow.onEvent_setProperties((id: McObjectId, prop: any) => {
       let ent = id.getMcDbEntity();
       if (!ent) return;
       if (prop.sVarName == "DN") {
           ent.setxDataDouble("DN", prop.val);
       }
       else if (prop.sVarName == "LEN") {
           ent.setxDataDouble("LEN", prop.val);
       }
   });

import { MxCADUiPrEntity, MxCpp } from "mxcad";

  // 设置对象扩展属性值。
  async function Mx_TestExProp() {
    let selEntity1 = new MxCADUiPrEntity();

    selEntity1.setMessage("选择要需要开启自定义属性的对象");
    let idText = await selEntity1.go();
    if (!idText.isValid()) return;

    let ent = idText.getMcDbEntity();
    MxCpp.PropertiesWindow.setEntitySupportCustom(idText);

    // 设置对象扩展属性值。
    ent.setxDataDouble("DN", 100);
    ent.setxDataDouble("LEN", 2000);
 }