arcgis【0基础 】【1】 中如何添加MXD

if (!axMapControl1.CheckMxFile(FileName))
{
MessageBox.Show("文件不合法");
return;
}
else
{

axMapControl1.LoadMxFile(FileName);
}

   string FileName = open.FileName;
                IMapDocument mapDoc = new MapDocument();
                mapDoc.Open(FileName, "");
                axMapControl1.Map = mapDoc.ActiveView.FocusMap;
                axMapControl1.ActiveView.Refresh();