MapControl加载CAD数据的示例代码

cadFile代表AutoCad文件的路径

private void btnLoadCAD_Click(object sender, EventArgs e)
        ...{
            string cadFile = @"F:AEStudyzxgTest.dwg";
            string workspacePath = System.IO.Path.GetDirectoryName(cadFile);
            string fileName = System.IO.Path.GetFileName(cadFile);

            //Add passed file to MapControl
            ICadDrawingDataset cadDrawingDataset = GetCadDataset(workspacePath, fileName);
            if (cadDrawingDataset == null) return;
            ICadLayer cadLayer = new CadLayerClass();
            cadLayer.CadDrawingDataset = cadDrawingDataset;
            cadLayer.Name = fileName;
            mapMain.AddLayer(cadLayer, 0);
        }

        private ICadDrawingDataset GetCadDataset(string cadWorkspacePath, string cadFileName)
        ...{
            //Create a WorkspaceName object
            IWorkspaceName workspaceName = new WorkspaceNameClass();
            workspaceName.WorkspaceFactoryProgID = "esriDataSourcesFile.CadWorkspaceFactory";
            workspaceName.PathName = cadWorkspacePath;

            //Create a CadDrawingName object
            IDatasetName cadDatasetName = new CadDrawingNameClass();
            cadDatasetName.Name = cadFileName;
            cadDatasetName.WorkspaceName = workspaceName;

            //Open the CAD drawing
            IName name = (IName)cadDatasetName;
            return (ICadDrawingDataset)name.Open();
        }

            比较困惑的是AutoCAD和地图文件的坐标怎么匹配。