【OBD C#】参考轴网读取

ITFApplication appInst = new TFApplicationList();
ITFLoadableProject proj;
ITFLoadableProjectList projList;
//dgnModelRef 为参考的轴网文件对应模型
//appInst.ModelReferenceLoadProject(dgnModelRef, 0, out projList)返回0
//但projList为null
//直接通过appInst.GetProject(0, out projList)读取的project返回的轴网数据不对
if (appInst.ModelReferenceLoadProject(dgnModelRef, 0, out projList) == 0 && projList != null)
{
    proj = projList.AsTFLoadableProject;
}

代码如上,请问该怎么在当前文件中读取参考轴网文件内的轴网数据

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