private void loadMapDocument()
        {     OpenFileDialog openFileDialog;
             openFileDialog = new OpenFileDialog();
             openFileDialog.Title = "打开地图对话框";
             openFileDialog.Filter = "Map Document(*.mxd)|*.mxd";
             openFileDialog.ShowDialog();
             string filePathName = openFileDialog.FileName;
             if (axMapControl1.CheckMxFile(filePathName))
             {
                 axMapControl1.MousePointer = esriControlsMousePointer.esriPointerArrow;
                 axMapControl1.LoadMxFile(filePathName, 0, Type.Missing );
                 axMapControl1.MousePointer = esriControlsMousePointer.esriPointerCrosshair;
                
             }
             else {
                 MessageBox.Show(filePathName +"不是有效的地图文档");
            
             }
         }

我是初学者 希望高手帮忙解答一下 谢谢！

axMapControl1.LoadMxFile(filePathName, 0, Type.Missing );这句话在运行的时候会出现问题

直接在if循环中写：axMapControl1.LoadMxFile(strFileName);其他的内容不要